J/ApJ/956/51 RESOLVE DR4 and ECO DR3 G3 groups HI catalogs (Hutchens+, 2023)
The RESOLVE and ECO Gas in Galaxy Groups initiative: the group finder and the
group HI-halo mass relation.
Hutchens Z.L., Kannappan S.J., Berlind A.A., Asad M., Eckert K.D.,
Stark D.V., Carr D.S., Castelloe E.R., Baker A.J., Hess K.M.,
Moffett A.J., Norris M.A., Croton D.
<Astrophys. J., 956, 51 (2023)>
=2023ApJ...956...51H 2023ApJ...956...51H
ADC_Keywords: Galaxies, group; H I data; Surveys; Photometry, ugriz;
Ultraviolet; Redshifts
Keywords: Galaxies ; Galaxy evolution ; Galaxy groups ; Galaxy dark matter halos
Abstract:
We present a four-step group-finding algorithm for the Gas in Galaxy
Groups (G3) initiative, a spin-off of the z∼0 REsolved Spectroscopy Of
a Local VolumE (RESOLVE) and Environmental COntext (ECO) surveys. In
preparation for future comparisons to intermediate redshift (e.g., the
LADUMA survey), we design the group finder to adapt to incomplete,
shallow, or nonuniform data. We use mock catalogs to optimize the
group finder's performance. Compared to friends-of-friends (with
false-pair splitting), the G3 algorithm offers improved completeness
and halo-mass recovery with minimal loss of purity. Combining it with
the volume-limited HI census data for RESOLVE and ECO, we examine the
HI content of galaxy groups as a function of group halo mass.
Group-integrated HI mass MHI,grp rises monotonically over halo
masses Mhalo∼1011-1014.5M☉, pivoting in slope at
Mhalo∼1011.4M☉, the gas-richness threshold scale. We present
the first measurement of the scatter in this relation, which has a
median of ∼0.3dex and is asymmetric toward lower MHI,grp. We discuss
interesting tensions with theoretical predictions and prior
measurements of the MHI,grp-Mhalo relation. In an appendix, we
release RESOLVE DR4 and ECO DR3, including updates to survey
redshifts, photometry, and group catalogs, as well as a major
expansion of the ECO HI inventory with value-added data products.
Description:
The REsolved Spectroscopy Of a Local VolumE (RESOLVE; Kannappan & Wei
2008AIPC.1035..163K 2008AIPC.1035..163K) survey is a volume-limited census of stellar,
gas, and dynamical mass in 53000Mpc3 of the nearby cosmic web.
RESOLVE contains >1400 galaxies in two ("A" and "B") equatorial strips.
RESOLVE-A, covering 8.75h≤RA≤15.75h and 0°≤DEC≤5°, is
complete to an absolute r-band magnitude of Mr=-17.33. RESOLVE-B,
covering 22h≤RA≤3h and -1.25°≤DEC≤+1.25°, is complete to
Mr=-17.0.
Membership in the RESOLVE survey is confined to 4500≤vgrp[km/s]≤7000,
where vgrp is the Local Group-corrected recessional velocity of the
galaxy's group from the original group catalog of
Eckert+ (2016, J/ApJ/824/124).
RESOLVE contains a uniquely comprehensive, fractional-mass-limited
21cm census (1.4MHI/M*≲0.05-0.1) constructed from public ALFALFA
data and deeper Arecibo and Green Bank observations
(Stark+ 2016, J/ApJ/832/126), detailed in Section 2.3.
RESOLVE also includes high-quality reprocessed multiwavelength
photometry (covering UV to NIR) and stellar masses derived from
spectral energy distribution modeling (Eckert+ 2015, J/ApJ/8/166).
With this work, we release RESOLVE DR4 with minor updates to HI
parameters and catalog membership, an updated FoF group catalog, and
our new G3 groups, detailed in Section 3 (Appendix).
The Environmental COntext (ECO; Moffett+ 2015ApJ...812...89M 2015ApJ...812...89M) survey
is a larger catalog surrounding RESOLVE-A in a 440000Mpc3 volume.
With this work, we release ECO DR3, which includes updates to survey
membership, galaxy redshifts, and the FoF group catalog, as well as
our new G3 groups and a major addition of archival 21cm data (Appendix).
File Summary:
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FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table4.dat 556 13861 ECO DR3 photometry & SED modeling outputs
table5.dat 174 13861 ECO DR3 galaxy groups
table6.dat 702 2289 RESOLVE DR4
table7.dat 173 13861 ECO DR3 21cm catalog
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See also:
VII/86 : Groups of Galaxies. I. Nearby Groups (Huchra+ 1982)
VIII/77 : HI spectral properties of galaxies (Springob+, 2005)
V/154 : Sloan Digital Sky Surveys (SDSS), Release 16 (DR16) (Ahumada+, 2020)
J/ApJ/496/39 : Properties of poor groups of galaxies. I. (Zabludoff+ 1998)
J/AJ/117/2039 : Sc galaxies I photometry, 21cm data (Haynes+, 1999)
J/ApJS/167/1 : Galaxy groups and clusters from SDSS (Berlind+, 2006)
J/AJ/142/170 : ALFALFA survey: α.40 HI source catalog (Haynes+, 2011)
J/ApJ/777/42 : Kinematic and HI data for the NFGS (Kannappan+, 2013)
J/ApJ/8/166 : RESOLVE survey photometry catalog (Eckert+, 2015)
J/ApJ/812/89 : Environmental COntext (ECO) catalog (Moffett+, 2015)
J/ApJ/824/124 : Galaxy stellar and baryonic mass functions (Eckert+, 2016)
J/ApJ/832/126 : RESOLVE survey: 21cm obs. with GBT & Arecibo (Stark+, 2016)
J/A+A/588/A14 : Friends-of-friends galaxy group finder (Tempel+, 2016)
J/ApJ/849/20 : Contents of RESOLVE & ECO galaxy groups (Eckert+, 2017)
J/ApJ/843/16 : Galaxy groups within 3500km/s (Kourkchi+, 2017)
J/ApJ/861/49 : ALFALFA extragalactic HI source catalog (Haynes+, 2018)
J/ApJ/857/144 : Tidal features from RESOLVE & DECaLS images (Hood+, 2018)
http://resolve.astro.unc.edu/pages/database.php : Online RESOLVE database
Byte-by-byte Description of file: table4.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [ECO]
4- 8 I5 --- ECO [1/13883] ECO galaxy identifier (name)
10- 15 A6 --- RESOLVE RESOLVE galaxy identifier if any
(resname)
16 A1 --- f_RESOLVE n: not in RESOLVE
18- 26 F9.5 deg RAdeg [130/237.5] Right Ascension (J2000)
28- 34 F7.4 deg DEdeg [-1/50] Declination (J2000)
36- 41 F6.1 km/s cz [2525/7518] Local Group-corrected
Recession Velocity of Galaxy
43- 48 F6.1 km/s cze16 [2532/7470] Local Group-corrected
Recession Velocity of Galaxy from E16
(Eckert+ 2016, J/ApJ/824/124)
50- 55 F6.1 km/s czhel [2419/7663] Heliocentric Recession
Velocity of Galaxy
57- 61 F5.1 Mpc Dist [36/107] Line-of-Sight Comoving
Distance to Galaxy (logscmvgdist)
63- 66 F4.1 --- vif [-6/0] Visual Inspection Flag (1)
68- 73 F6.1 --- fm15 [1]?=-999 ECO DR1 Moffett+15
(J/ApJ/812/89) membership flag
75- 82 F8.3 mag nuvmag [0/24]?=-999 Apparent magnitude in
GALEX NUV band (2)
84- 91 F8.3 mag e_nuvmag [0/3.6]?=-999 Error in NUVmag
93- 100 F8.3 mag umag [0/22.3]?=-999 Apparent magnitude in
SDSS u band (2)
102- 109 F8.3 mag e_umag [0/3]?=-999 Error in umag
111- 118 F8.3 mag gmag [0/22]?=-999 Apparent magnitude in SDSS
g band (2)
120- 127 F8.3 mag e_gmag [0/1.7]?=-999 Error in gmag
129- 136 F8.3 mag rmag [10.5/21]?=-999 Apparent magnitude in
SDSS r band (2)
138- 145 F8.3 mag e_rmag [0.02/1.7]?=-999 Error in rmag
147- 154 F8.3 mag imag [0/20.6]?=-999 Apparent magnitude in
SDSS i band (2)
156- 163 F8.3 mag e_imag [0/1.7]?=-999 Error in imag
165- 172 F8.3 mag zmag [0/20.9]?=-999 Apparent magnitude in
SDSS z band (2)
174- 181 F8.3 mag e_zmag [0/1.7]?=-999 Error in zmag
183- 190 F8.3 mag Jmag [0/16]?=-999 Apparent magnitude in
2MASS J band (2)
192- 199 F8.3 mag e_Jmag [0/2.3]?=-999 Error in Jmag
201- 208 F8.3 mag Hmag [0/15]?=-999 Apparent magnitude in
2MASS H band (2hmag) (2)
210- 217 F8.3 mag e_Hmag [0/2.3]?=-999 Error in Hmag (e_2hmag)
219- 226 F8.3 mag Ksmag [0/14.5]?=-999 Apparent magnitude in
2MASS Ks band (2kmag) (2)
228- 235 F8.3 mag e_Ksmag [0/2.3]?=-999 Error in Ksmag (e_2kmag)
237- 244 F8.3 mag YmagUK [0/20.1]?=-999 Apparent magnitude in
UKIDSS Y band (uymag) (2)
246- 253 F8.3 mag e_YmagUK [0/2.3]?=-999 Error in YmagUK (e_uymag)
255- 262 F8.3 mag HmagUK [0/18]?=-999 Apparent magnitude in
UKIDSS H band (uhmag) (2)
264- 271 F8.3 mag e_HmagUK [0/2.3]?=-999 Error in HmagUK (e_uhmag)
273- 280 F8.3 mag KmagUK [0/17.5]?=-999 Apparent magnitude in
UKIDSS K band (ukmag) (2)
282- 289 F8.3 mag e_KmagUK [0/2.3]?=-999 Error in KmagUK (e_ukmag)
291- 295 F5.3 mag extnuv [0.029/1.8] Foreground extinction in
GALEX NUV band
297- 301 F5.3 mag extu [0.016/1] Foreground extinction in SDSS
u band
303- 307 F5.3 mag extg [0.012/0.8] Foreground extinction in
SDSS g band
309- 313 F5.3 mag extr [0.009/0.6] Foreground extinction in
SDSS r band
315- 319 F5.3 mag exti [0.007/0.4] Foreground extinction in
SDSS i band
321- 325 F5.3 mag extz [0.005/0.3] Foreground extinction in
SDSS z band
327- 331 F5.3 mag exty [0.004/0.23] Foreground extinction in
UKIDSS Y band
333- 337 F5.3 mag extJ [0.003/0.2] Foreground extinction in
2MASS J band
339- 343 F5.3 mag extH [0.002/0.11] Foreground extinction in
2MASS and UKIDSS H bands
345- 349 F5.3 mag extK [0.001/0.07] Foreground extinction in
2MASS and UKIDSS K bands
351- 432 A82 mag RejPhot Photometry rejected during SED fitting
(rejectedphot)
434 I1 --- Badr [0/2] Bad r-band Photometry Flag
(badrphot) (3)
436- 440 F5.2 [Msun] logMs [6.9/12] Log Galaxy Stellar Mass
(logmstar) (4)
442- 448 F7.3 mag rMAG [-24/-13.5] Absolute Magnitude in SDSS
r Band (absrmag) (5)
450- 456 F7.3 mag rMAGe16 [-24/-13.5] Absolute Magnitude in SDSS
r Band from E16 (Eckert+ 2016,
J/ApJ/824/124) (absrmage16) (5)
458- 464 F7.3 mag rMAGMod [-24/-13.3] Rest Frame SED Modeled
Absolute Magnitude in SDSS r Band
(modelabsrmag) (6)
466- 470 F5.3 mag NUV-rMod [0.5/6.5] Rest Frame SED Modeled
(NUV-r) Color (modelnuvr) (6)
472- 476 F5.3 mag u-rMod [0.49/3.11] Rest Frame SED Modeled
(u-r) Color (modelur) (6)
478- 482 F5.3 mag u-iMod [0.6/3.7] Rest Frame SED Modeled (u-i)
Color (modelui) (6)
484- 488 F5.3 mag u-JMod [1.5/5.5] Rest Frame SED Modeled (u-J)
Color (modeluj) (6)
490- 494 F5.3 mag u-KMod [2.2/6.5] Rest Frame SED Modeled (u-K)
Color (modeluk) (6)
496- 500 F5.3 mag g-rMod [0.026/1.01] Rest Frame SED Modeled
(g-r) Color (modelgr) (6)
502- 506 F5.3 mag g-iMod [0.049/1.51] Rest Frame SED Modeled
(g-i) Color (modelgi) (6)
508- 512 F5.3 mag g-JMod [0.9/3.32] Rest Frame SED Modeled (g-J)
Color (modelgj) (6)
514- 518 F5.3 mag g-KMod [1.6/4.4] Rest Frame SED Modeled (g-K)
Color (modelgk) (6)
520- 524 F5.3 mag u-rModc [0.49/3.1] Rest Frame SED Modeled (u-r)
Color Corrected for Internal Extinction
(modelurcorr) (7)
526- 533 F8.3 arcsec r50 [0.87/204]?=-999 Half-light Radius in r
Band (8)
535- 542 F8.3 arcsec r90 [1.9/222]?=-999 90%-light Radius in
rBand (8)
544- 548 F5.3 --- Ratio [0.03/0.95] Axial Ratio (axialratio)
550- 556 F7.2 [Msun/kpc2] muDelta [4/12]?=-999 Morphological metric
(mudelta) (9)
--------------------------------------------------------------------------------
Note (1): Inspection flag resulting from duplicate search. No duplicate
database entries are included in this table, but this data column
tabulates the reasons why particular galaxies were inspected or
eliminated as possible duplicates. Possible values are listed below
and in section A.2. Code as follows:
0.0: The galaxy is assumed to not be a duplicate, but has not
visually inspected.
-1.0: The galaxy is the primary target within a merger remnant
representing one catalog object.
-2.0: The galaxy was duplicated in ECO DR2 and only this entry is kept
in ECO DR3.
-3.0: ECO DR2 included a second entry for this galaxy that was centered
on a spiral arm or other feature.
-4.0: The galaxy has a nearby object at similar redshift, but no obvious
connecting material or peculiar morphological features
indicate a merger in progress.
-5.0: The galaxy is within the effective radius of a second galaxy
or vice versa.
-6.0: The galaxy is undergoing a merger, but both cores are
visually identifiable.
Note (2): Custom remeasured value from Eckert et al. (2016ApJ...824..124E 2016ApJ...824..124E),
provided without foreground extinction correction. A NULL value
indicates the value was rejected during SED fitting (see
"RejPhot" for measured values).
Note (3): Bad r-band photometry flag (see section A.4), marking galaxies
for which effective radii were previously set to arbitrary or
negative values due to pipeline failures. Code as follows:
0 = No r-band photometry issue,
1 = bad but usable r-band photometry or "rMAG" inferred from stellar mass,
2 = unreliable r-band photometry and stellar mass.
Note (4): Log galaxy stellar mass derived using "cz" to calculate
cosmological luminosity distances. Please refer to the bad r-band
photometry flat ("Badr") when using this column.
Note (5): Absolute magnitude based on custom r-band photometry of
Eckert et al. (2016ApJ...824..124E 2016ApJ...824..124E), foreground extinction correction
included, scaled to "cz" or "cze16" as discussed in section A.3.
Please refer to the "Badr" column when using these columns.
Note (6): Values include foreground extinction corrections and k-corrections,
but not internal extinction corrections.
Note (7): As explained in section A.4, we expect non-uniformity in the
internal extinction corrections for ECO outside RESOLVE. We recommend
"u-rMod" for ECO analyses requiring uniformity.
Note (8): Values are set to NULL where "Badr">0.
Note (9): Morphological metric mu_Δ (Msun/kpc**2) defined in
Kannappan+ (2013ApJ...777...42K 2013ApJ...777...42K), derived using "cz" to calculate
cosmological angular diameter distances. Values are set to NULL where
"Badr">0.
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Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [ECO]
4- 8 I05 --- ECO [1/13883] ECO galaxy identifier (name)
10 I1 --- E17in [0/1] In-Volume Flag for E17 Groups
(invole17) (1)
12- 16 I5 --- g3grp [1/17339] G3 Group Identifier (g3grp)
17- 18 A2 --- --- [.0]
20- 28 F9.5 deg RAdeg [130/237.5] G3 Group Center RA (J2000)
(g3grpradeg)
30- 37 F8.5 deg DEdeg [-1/50] G3 Group Center Declination
(J2000) (g3grpdedeg)
39- 44 F6.1 km/s czG3 [2525/7486] G3 Group Center cz
(g3grpcz) (2)
46 I1 --- G3in [0/1] In-Volume Flag for G3 Groups
(involg3) (1)
48- 52 F5.1 --- NgG3 [0/133] Number of Giants in G3 Group
(g3grpngi)
54- 58 F5.1 --- NdwG3 [0/216] Number of Dwarfs in G3 Group
(g3grpndw)
60- 65 F6.2 mag rMAGG3 [-26.72/-13.57] G3 Group-Integrated
r-Band absolute magnitude (g3grpabsrmag)
67- 73 F7.2 mag rMAGgG3 [-26.6/-19.5]?=-999 G3 Group-Integrated
giant r-band absolute magnitude
(g 3grpgiantabsrmag)
75- 79 F5.2 [Msun] logMhvirG3 [10.84/14.56] G3 HAM Log Group Mass (337b)
(g3logmhvir) (3)
81- 85 F5.2 [Msun] logMh280G3 [10.62/14.51] G3 HAM Log Group Mass (280b)
(g3logmh280) (4)
87- 91 F5.2 [Msun] logMHIG3 [6.5/11.15] G3 Log Group-Integrated HI
Mass (g3grpmhi)
93- 95 F3.1 --- G3fc [0/1] G3 Central Galaxy Flag (g3fc) (5)
97- 103 F7.5 --- CCor [1/1.5] Boundary Completeness Correction
Factor (ccbremapped) (6)
105- 109 I5 --- fofgrp [1/22909] FoF Group Identifier (fofgrp)
110- 111 A2 --- --- [.0]
113- 121 F9.5 deg RAFdeg [130/237.5] FoF Group Center RA J2000
(fofgrpradeg)
123- 130 F8.5 deg DEFdeg [-1/50] FoF Group Center Dec J2000
(fofgrpdedeg)
132- 137 F6.1 km/s czfof [2525/7505] FoF Group Center cz
(fofgrpcz) (2)
139 I1 --- fofin [0/1] In-Volume Flag for FoF Groups
(involfof) (1)
141- 145 F5.1 --- Ngfof [1/250] Number of Galaxies in FoF Group
(fofgrpn)
147- 152 F6.2 mag rMAGfof [-26.6/-13.5] FoF Group-Integrated r-Band
absolute magnitude (fofgrpabsrmag)
154- 158 F5.2 [Msun] logMhvirfof [10.8/14.6] FoF HAM Log Group Mass (337b)
(foflogmhvir) (3)
160- 164 F5.2 [Msun] logMh280fof [10.6/14.51] FoF HAM Log Group Mass (280b)
(foflogmh280) (4)
166- 170 F5.2 [Msun] logMHIfof [6.5/11.1] FoF Log Group-Integrated HI
Mass (fofgrpmhi)
172- 174 F3.1 --- foffc [0/1] FoF Central Galaxy Flag (foffc) (5)
--------------------------------------------------------------------------------
Note (1): Group in-volume flag, 1 if group satisfies 3000<czgrp[km/s]<7000.
Col. E17in ("invole17") is calculated using "Grpcz" from Table 1 of
Eckert+ (2017, J/ApJ/849/20), included here to enable reconstruction of
prior survey membership by joining to "rMAGe16".
Note (2): Local Group-corrected recession velocity of group center, derived
using "cz" in Table 4.
Note (3): HAM performed using the Tinker+ (2008ApJ...688..709T 2008ApJ...688..709T) halo mass
function.
Note (4): HAM performed using the Warren+ (2006ApJ...646..881W 2006ApJ...646..881W) halo mass
function.
This mass function corresponds to an overdensity contrast of
Δ=280 times the mean background density as explained in the
erratum published in 2025, ApJ, 985, 270.
Note (5): 1 if galaxy is the group's central (most luminous in r band),
0 otherwise.
Note (6): Correction factors for group galaxy number count incompleteness due
to group peculiar velocities extending beyond the RESOLVE and ECO
redshift limits; affects only Coma and two massive groups. If >1, the
group extends beyond ECO's redshift range. Values as computed by E16
based on "cze16", mapped to our new G3 group catalog as described in
section A.5.
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Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 6 A6 --- RESOLVE RESOLVE Galaxy Identifier (name)
8- 15 F8.4 deg RAdeg Right ascension (J2000)
17- 23 F7.4 deg DEdeg [-1.3/5] Declination (J2000)
25- 30 F6.1 km/s cz [4253/7284] Local Group-corrected
Recession Velocity of Galaxy (1)
32- 37 F6.1 km/s czhel [4077/7440] Heliocentric Recession
Velocity of Galaxy
39- 43 F5.1 Mpc Dist [60/104] Line-of-Sight Comoving
Distance to Galaxy (loscmvgdist)
45- 52 F8.3 mag nuvmag [0/24]?=-999 Apparent Magnitude in
GALEX NUV Band (2)
54- 61 F8.3 mag e_nuvmag [0/3.6]?=-999 Error in NUVmag
63- 70 F8.3 mag umag [0/22.3]?=-999 Apparent Magnitude in
SDSS u Band (2)
72- 79 F8.3 mag e_umag [0/2.5]?=-999 Error in umag
81- 86 F6.3 mag gmag [11.9/22] Apparent Magnitude in SDSS
g Band (2)
88- 92 F5.3 mag e_gmag [0/1.3]?=-999 Error in gmag
94- 99 F6.3 mag rmag [11/21] Apparent Magnitude in SDSS r
Band (2)
101- 105 F5.3 mag e_rmag [0.02/1.7]?=-999 Error in rmag
107- 114 F8.3 mag imag [10.6/20.6]?=-999 Apparent Magnitude
in SDSS i Band (2)
116- 123 F8.3 mag e_imag [0.02/1.1]?=-999 Error in imag
125- 132 F8.3 mag zmag [0/21]?=-999 Apparent Magnitude in
SDSS z Band (2)
134- 141 F8.3 mag e_zmag [0/1.7]?=-999 Error in zmag
143- 150 F8.3 mag Jmag [0/16]?=-999 Apparent Magnitude in
2MASS J Band (2Jmag) (2)
152- 159 F8.3 mag e_Jmag [0/2]?=-999 Error in 2Jmag (e_2Jmag)
161- 168 F8.3 mag Hmag [0/15]?=-999 Apparent Magnitude in
2MASS H Band (2Hmag) (2)
170- 177 F8.3 mag e_Hmag [0/2.2]?=-999 Error in 2Hmag
(e_2Hmag)
179- 186 F8.3 mag Ksmag [0/14.5]?=-999 Apparent Magnitude in
2MASS Ks Band (2Kmag) (2)
188- 195 F8.3 mag e_Ksmag [0/2.1]?=-999 Error in 2Kmag
(e_2Kmag)
197- 204 F8.3 mag YmagUK [0/20.1]?=-999 Apparent Magnitude in
UKIDSS Y Band (uYmag) (2)
206- 213 F8.3 mag e_YmagUK [0/2.3]?=-999 Error in uYmag
(e_uYmag)
215- 222 F8.3 mag HmagUK [0/18]?=-999 Apparent Magnitude in
UKIDSS H Band (uHmag) (2)
224- 231 F8.3 mag e_HmagUK [0/2.3]?=-999 Error in uHmag
(e_uHmag)
233- 240 F8.3 mag KmagUK [0/17.5]?=-999 Apparent Magnitude in
UKIDSS K Band (uKmag) (2)
242- 249 F8.3 mag e_KmagUK [0/2.3]?=-999 Error in uKmag
(e_uKmag)
251- 255 F5.3 mag extnuv [0.13/1.8] Foreground Extinction in
GALEX NUV Band (3)
257- 261 F5.3 mag extu [0.07/1] Foreground Extinction in
SDSS u Band
263- 267 F5.3 mag extg [0.05/0.8] Foreground Extinction in
SDSS g Band
269- 273 F5.3 mag extr [0.039/0.6] Foreground Extinction in
SDSS r Band
275- 279 F5.3 mag exti [0.03/0.4] Foreground Extinction in
SDSS i Band
281- 285 F5.3 mag extz [0.02/0.3] Foreground Extinction in
SDSS z Band
287- 291 F5.3 mag extY [0.017/0.23] Foreground Extinction
in UKIDSS Y Band
293- 297 F5.3 mag extJ [0.01/0.2] Foreground Extinction in
2MASS J Band
299- 303 F5.3 mag extH [0.008/0.11] Foreground Extinction
in 2MASS and UKIDSS H Bands
305- 309 F5.3 mag extK [0.005/0.07] Foreground Extinction
in 2MASS and UKIDSS K Bands
311- 390 A80 mag RejPhot Photometry Rejected During SED
Fitting (rejectedphot)
392- 396 F5.2 [Msun] logMs [6.9/11.7] Log Galaxy Stellar Mass
(logmstar) (4)
398- 404 F7.3 mag rMAG [-23.61/-13.5] Absolute Magnitude in
SDSS r Band (absrmag) (5)
406- 412 F7.3 mag rMAGMod [-23.62/-13.28] Rest Frame SED
Modeled Absolute Magnitude in SDSS r
Band (modelabsrmag) (6)
414- 418 F5.3 mag NUV-rMod [0.6/6.1] Rest Frame SED Modeled
(NUV-r) Color (modelnuvr) (6)
420- 424 F5.3 mag u-rMod [0.6/2.8] Rest Frame SED Modeled
(u-r) Color (modelur) (6)
426- 430 F5.3 mag u-iMod [0.6/3.3] Rest Frame SED Modeled
(u-i) Color (modelui) (6)
432- 436 F5.3 mag u-JMod [1.5/5] Rest Frame SED Modeled (u-J)
Color (modeluj) (6)
438- 442 F5.3 mag u-KMod [2.2/6.1] Rest Frame SED Modeled
(u-K) Color (modeluk) (6)
444- 448 F5.3 mag g-rMod [0.027/0.92] Rest Frame SED Modeled
(g-r) Color (modelgr) (6)
450- 454 F5.3 mag g-iMod [0.05/1.4] Rest Frame SED Modeled
(g-i) Color (modelgi) (6)
456- 460 F5.3 mag g-JMod [0.96/3.2] Rest Frame SED Modeled
(g-J) Color (modelgj) (6)
462- 466 F5.3 mag g-KMod [1.6/4.2] Rest Frame SED Modeled
(g-K) Color (modelgk) (6)
468- 472 F5.3 mag u-rModc [0.59/2.63] Rest Frame SED Modeled
(u-r) Color Corrected for Internal
Extinction (modelurcorr) (7)
474- 479 F6.3 arcsec r50 [1.27/52] Half-light Radius in r Band
481- 487 F7.3 arcsec r90 [2.8/191] 90%-light Radius in r Band
489- 493 F5.3 --- Ratio [0.13/0.95] Axial Ratio (axialratio)
495- 499 F5.2 [Msun/kpc2] muDelta [5.3/10.6] Morphological metric
(mudelta) (8)
501- 513 F13.1 Msun MHIdet [0/26575000000] Galaxy HI Mass for
21cm Detection (9)
515- 527 F13.1 Msun e_MHIdet [0/19341300000] Statistical
Uncertainty on Galaxy HI Mass from
21cm Detection; even if confused
529- 540 F12.1 Msun MHIlim [0/1878700000] Upper Limit on HI
Mass for Non-detection (10)
542- 546 F5.2 [Msun] logMgas [6.68/10.41] Best Estimate of Atomic
Gas Mass (11)
548- 550 F3.1 --- f_logMgas [0/3] Type Flag for Atomic Gas Mass
Estimate (logmgastype) (12)
552- 556 I5 --- G3grp [16/28452] G3 Group Identifier
557- 558 A2 --- --- [.0]
560- 568 F9.5 deg RAG3deg G3 Group Center RA (J2000)
(g3grpradeg)
570- 577 F8.5 deg DEG3deg [-1.3/5.1] G3 Group Center
Declination (J2000) (g3grpdedeg)
579- 584 F6.1 km/s czG3 [4188/7284] G3 Group Center cz
(g3grpcz) (13)
586- 588 F3.1 --- NgG3 [0/9] Number of Giants in G3 Group
(g3grpngi)
590- 593 F4.1 --- NdwG3 [0/27] Number of Dwarfs in G3 Group
(g3grpndw)
595- 600 F6.2 mag rMAGG3 [-24.4/-13.5] G3 Group-Integrated
r-Band Abs. Mag. (g3grpabsrmag)
602- 606 F5.2 [Msun] logMhvirG3 [10.8/14.1] G3 HAM Log Group Mass
(337b) (g3logmhvir) (14)
608- 612 F5.2 [Msun] logMh280G3 [10.6/14] G3 HAM Log Group Mass
(280b) (g3logmh280) (15)
614- 618 F5.2 [Msun] logMHIG3 [6.5/10.62] G3 Log Group-Integrated
HI Mass (g3grpmhi)
620- 622 F3.1 --- G3fc [0/1] G3 Central Galaxy Flag (16)
624- 626 F3.1 --- CutG3 [0/1] RESOLVE-A Sky Cutoff Flag for
G3 Groups (g3skycutoffflag) (17)
628 I1 --- G3in [0/1] In-Volume Flag for G3 Groups
(involg3) (18)
630- 634 I5 --- fofgrp [28/47074] FoF Group Identifier
(fofgrp)
635- 636 A2 --- --- [.0]
638- 646 F9.5 deg RAFdeg FoF Group Center RA (J2000)
(fofgrpradeg)
648- 655 F8.5 deg DEFdeg [-1.3/5.1] FoF Group Center
Declination (J2000) (fofgrpdedeg)
657- 662 F6.1 km/s czfof [4178/7299] FoF Group Center cz
(fofgrpcz) (13)
664- 667 F4.1 --- Ngfof [1/37] Number of Galaxies in FoF
Group (fofgrpn)
669- 674 F6.2 mag rMAGfof [-24.4/-13.5] FoF Group-Integrated
r-Band Abs. Mag. (fofgrpabsrmag)
676- 680 F5.2 [Msun] logMhvirfof [10.8/14.1] FoF HAM Log Group Mass
(337b) (foflogmhvir) (14)
682- 686 F5.2 [Msun] logMh280fof [10.6/14] FoF HAM Log Group Mass
(280b) (foflogmh280) (15)
688- 692 F5.2 [Msun] logMHIfof [6.5/10.5] FoF Log Group-Integrated
HI Mass (fofgrpmhi)
694- 696 F3.1 --- foffc [0/1] FoF Central Galaxy Flag
(foffc) (16)
698- 700 F3.1 --- Cutfof [0/1] RESOLVE-A Sky Cutoff Flag for
FoF Groups (fofskycutoffflag) (17)
702 I1 --- fofin [0/1] In-Volume Flag for FoF Groups
(involfof) (18)
--------------------------------------------------------------------------------
Note (1): Value unchanged from Eckert et al. (2015, J/ApJ/810/166).
Note (2): Custom remeasured value from Eckert+ (2015, J/ApJ/810/166), provided
without foreground extinction correction. A NULL value indicates
the value was rejected during SED fitting (see "RejPhot" for
measured values).
Note (3): NUV foreground extinction corrections supersede values
from Eckert+ (2015, J/ApJ/810/166), which were
inadvertently tabulated (but not used) at 10 times the true value.
Note (4): Log galaxy stellar mass derived using "cz" to calculate cosmological
luminosity distances.
Note (5): Absolute magnitude based on custom r-band photometry of
Eckert+ (2015, J/ApJ/810/166), foreground extinction
correction included, derived using "cz" to calculate cosmological
luminosity distances.
Note (6): Values include foreground extinction corrections and k-corrections,
but not internal extinction corrections.
Note (7): Values include foreground extinction corrections, k-corrections,
and internal extinction corrections.
Note (8): Morphological metric muΔ (Msun/kpc**2) defined in
Kannappan+ (2013, J/ApJ/777/42), derived using "cz" to
calculate cosmological angular diameter distances.
Note (9): HI mass derived using "cz" to calculate cosmological luminosity
distances; 0 if not detected or not observed. If the observation is
confused, this column reports the total HI mass.
Note (10): Upper limit on HI mass derived using "cz" to calculate cosmological
luminosity distances; 0 if detected in HI or not observed.
Note (11): Optimal atomic gas mass (1.4 times HI mass to include He) estimate
based on detection, upper limit, confusion, and/or photometric gas
fraction information; see section A.6.2.
Note (12): See section A.6.2 for explanations of possible values.
Note (13): Local Group-corrected recession velocity of group center,
derived using "cz".
Note (14): HAM performed using Tinker et al. (2008ApJ...688..709T 2008ApJ...688..709T)
halo mass function.
Note (15): HAM performed using Warren et al. (2006ApJ...646..881W 2006ApJ...646..881W)
halo mass function.
This mass function corresponds to an overdensity contrast of
Δ=280 times the mean background density as explained in the
erratum published in 2025, ApJ, 985, 270.
Note (16): 1 if a galaxy is the group's central (most luminous in r band),
0 otherwise.
Note (17): RESOLVE-A sky cutoff flag, 1 for groups that have members both
within RESOLVE-A and in the larger ECO survey outside RESOLVE-A
(i.e., groups at the edges of the RESOLVE-A footprint).
Note (18): Group in-volume flag, 1 if group satisfies 4500<czgrp<7000.
We do not tabulate E17in ("invole17") for RESOLVE, as all quantities
necessary to reconstruct prior RESOLVE membership have been
published previously.
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table7.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 3 A3 --- --- [ECO]
4- 8 I5 --- ECO [1/13883] ECO galaxy identifier (name)
10- 22 F13.1 Msun MHIdet [0/63800600000] Galaxy HI Mass from
ALFALFA-100 or RESOLVE 21cm Detection (1)
24- 36 F13.1 Msun e_MHIdet [0/19341300000] Statistical Uncertainty
on Galaxy HI Mass from 21cm Detection;
even if confused
38 I1 --- conf [0/1] Confusion Flag (confused) (2)
40- 51 F12.1 Msun MHIlim [0/2453800000] Upper Limit on HI Mass
from ALFALFA-100 or RESOLVE (3)
53- 63 F11.1 Msun limsigma [0/504300000]? Integrated RMS Noise for
Non-detection (4)
65- 67 F3.1 --- limmult [0/5] Upper Limit Level, 3 or 5 (5)
69- 74 F6.4 Jy rmsHI [0/0.01] RMS Noise Level of HI Spectrum
(hirms) (6)
76- 82 A7 --- Tel Source of HI Data (hitelescope) (7)
84- 88 F5.1 --- SNRHIpk [0/281.3] Peak SNR of 21cm Line Detection
(peaksnhi)
90- 94 F5.2 [Msun] logMgas [6.68/11.2] Log best Estimate of Atomic
Gas Mass (8)
96- 98 F3.1 --- f_logMgas [0/3] Type Flag for Atomic Gas Mass
Estimate (logmgastype) (9)
100- 112 F13.1 Msun MHId100 [0/63800600000] Galaxy HI Mass from
ALFALFA-100 21cm Detection
(mhideta100) (1)
114- 124 F11.1 Msun e_MHId100 [0/527100000] Statistical Uncertainty on
ALFALFA-100 HI Mass (even if confused)
(e_mhideta100)
126- 128 F3.1 --- confd100 [0/1] Confusion Flag for ALFALFA-100
Detection (confuseda100) (2)
130- 137 F8.1 --- agcnra100 [4526/749500]?=-999 Arecibo General
Catalog Number (agcnra100)
139- 150 F12.1 Msun MHIlima100 [0/2453800000] Upper Limit on ALFALFA-100
HI Mass (mhilima100) (3)
152- 157 F6.4 Jy rmsHIa100 [0/0.01] RMS Noise Level of HI Spectrum
(hirmsa100) (6)
159- 163 F5.1 --- SNRHIa100pk [0/281.3] Peak SNR of ALFALFA-100 21cm
Line Detection (peaksnhia100)
165- 169 F5.2 [Msun] logMgasa100 [6.39/11.2] Log best Estimate of Atomic
Gas Mass from ALFALFA-100 Data
(logmgasa100) (8)
171- 173 F3.1 --- f_logMgasa100 [0/3] Type Flag for Atomic Gas Mass
Estimate from ALFALFA-100 Data
(logmgastypea100) (9)
--------------------------------------------------------------------------------
Note (1): HI mass derived using "cz" to calculate cosmological luminosity
distances; 0 if not detected or not observed. If the observation
is confused, this column reports the total HI mass.
Note (2): 1 = observation likely confused; 0 = not confused or not observed.
Note (3): Upper limit on HI mass derived using "cz" to calculate cosmological
luminosity distances. 0 if detected in HI or not observed.
Note (4): Based on estimated RMS noise level and estimated W20 assuming 10km/s
channels; 0 for detections. Upper limits computed
at 3 or 5 times this value.
Note (5): Level of upper limit, 3 for RESOLVE sources and 5 for rest of ECO in
ALFALFA-100 field; 0 for detections.
Note (6): Measured from 21cm spectra for RESOLVE-A galaxies, drawn from
ALFALFA-100 catalog for detected ECO galaxies, or estimated
from Fig. 21b for non-detections.
Note (7): Source of HI data. Possible values:
GBT = Green Bank Telescope (Stark+ 2016, J/ApJ/832/126)
AO = Arecibo Observatory (Stark+ 2016, J/ApJ/832/126)
ALFALFA = ALFALFA HI Survey (Haynes+ 2011, J/AJ/142/170, 2018, J/ApJ/861/49)
S05 = Springob et al. (2005, VIII/77)
Note (8): Optimal atomic gas mass (1.4 times HI mass to include He) estimate
based on detection, upper limit, confusion, and/or photometric
gas fraction information; see section A.6.2.
Note (9): See section A.6.2 for explanations of possible values.
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 10-Dec-2025