J/AJ/160/271 A catalog of ∼30000 galaxies with ALFALFA-SDSS (Durbala+, 2020)
The ALFALFA-SDSS galaxy catalog.
Durbala A., Finn R.A., Odekon M.C., Haynes M.P., Koopmann R.A.,
O'Donoghue A.A.
<Astron. J., 160, 271 (2020)>
=2020AJ....160..271D 2020AJ....160..271D
ADC_Keywords: Galaxies; Photometry, RI; Photometry, G band; Extinction; Colors
Keywords: Galaxies ; Late-type galaxies ; Galaxy evolution ; Sky surveys ;
Astronomy databases
Abstract:
We present a HI optical catalog of ∼30000 galaxies based on the 100%
complete Arecibo Legacy Fast Arecibo L-band Feed Array (ALFALFA)
survey combined with data from the Sloan Digital Sky Survey (SDSS).
Our goal is to facilitate the public use of the completed ALFALFA
catalog by providing carefully determined matches to SDSS
counterparts, including matches for ∼10000 galaxies that do not have
SDSS spectra. These identifications can provide a basis for further
crossmatching with other surveys using SDSS photometric IDs as a
reference point. We derive absolute magnitudes and stellar masses for
each galaxy using optical colors combined with an internal reddening
correction designed for small- and intermediate-mass galaxies with
active star formation. We also provide measures of stellar masses and
star formation rates based on infrared and/or ultraviolet photometry
for galaxies that are detected by the Wide-field Infrared Survey
Explorer and/or the Galaxy Evolution Explorer. Finally, we compare the
galaxy population in the ALFALFA-SDSS sample with the populations in
several other publicly available galaxy catalogs and confirm that
ALFALFA galaxies typically have lower masses and bluer colors.
Description:
The Arecibo Legacy Fast Arecibo L-band Feed Array (ALFALFA) survey
provides HI 21cm line measurements for ∼31500 galaxies over nearly
7000deg2 on the sky, out to a redshift of about 0.06.
Exploiting the large collecting area of the Arecibo 305m antenna and
the seven-beam ALFA radio camera, ALFALFA mapped ∼6600deg2 of high
galactic latitude sky in spectral line mode, covering a 100MHz
bandwidth corresponding to 2000<cz<18000km/ sampled as 4096 spectral
channels, yielding a resolution of 5.5km/s at z∼0 before smoothing.
Following the recommendations on the SDSS website, we use SDSS cmodel
mags to calculate galaxy absolute magnitudes and model mags for
colors.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 103 31501 Basic optical properties of cross-listed objects
in the ALFALFA-SDSS catalog
table2.dat 122 31501 Derived properties of cross-listed objects in the
ALFALFA-SDSS catalog
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See also:
II/363 : The band-merged unWISE Catalog (Schlafly+, 2019)
VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998)
VIII/77 : HI spectral properties of galaxies (Springob+, 2005)
J/AJ/133/2569 : Arecibo legacy fast ALFA survey III. (Giovanelli+, 2007)
J/AJ/136/713 : Arecibo legacy fast ALFA survey. VI. (Kent+, 2008)
J/ApJ/692/556 : Star forming galaxy templates (Rieke+, 2009)
J/AJ/139/2130 : ALFA-ZOA precursor observation (Henning+, 2010)
J/PASP/122/1397 : Spitzer Survey of Stellar Structure in Galaxies (Sheth+,2010)
J/AJ/142/170 : ALFALFA survey: α.40 HI source catalog (Haynes+, 2011)
J/A+A/553/A91 : Halpha3 survey of Virgo and Coma galaxies (Fossati+, 2013)
J/ApJ/771/59 : Surface brightness S4G face-on galaxies (Munoz-Mateos+, 2013)
J/ApJ/842/133 : HI-bearing ultra-diffuse ALFALFA galaxies (Leisman+, 2017)
J/ApJ/861/49 : ALFALFA extragalactic HI source catalog (Haynes+, 2018)
http://www.sdss.org/ : SDSS website
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- AGC [1/749512] AGC catalog identifier
8- 8 I1 --- Flag [0/3] Photometry flag (1)
10- 29 I20 --- ObjID Optical counterpart SDSS DR15 object identifier
31- 40 F10.6 deg RAdeg [0.003/360] Right Ascension (J2000) (2)
42- 49 F8.5 deg DEdeg [-0.21/36.4] Declination (J2000) (2)
51- 55 I5 km/s RVel [-430/17823] HI profile midpoint heliocentric
radial velocity
57- 61 F5.1 Mpc Dist [0.3/260] Distance from Haynes+, 2018, J/ApJ/861/49
63- 66 F4.1 Mpc e_Dist [0/30.9] Uncertainty in Dist
68- 71 F4.2 mag gext [0.02/4.44]? Foreground Galactic extinction in
SDSS g band (3)
73- 76 F4.2 mag iext [0.01/2.28]? Foreground Galactic extinction in
SDSS i band (3)
78- 81 F4.2 --- b/a [0.05/1]? Axial ratio b/a from SDSS r band
83- 88 F6.2 --- e_b/a [0.01/865]? Uncertainty in b/a (4)
90- 94 F5.2 mag imag [9.58/30.89]? SDSS i band cmodel magnitude
96-103 F8.2 mag e_imag [0.01/42134.68]? Uncertainty in imag (4)
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Note (1): Flags as follows:
0 = outside the SDSS footprint (1296 occurrences)
1 = SDSS photometry with uncertainties less than 0.05 in g and
i (good photometry, 28267 occurrences)
2 = SDSS photometry with uncertainties greater than 0.05 in g and/or
i (bad photometry, 1371 occurrences)
3 = no SDSS counterpart identified, despite being within the SDSS footprint
(567 occurrences)
Note (2): Of the optical counterpart or HI centroid, if no optical
counterpart has been identified.
Note (3): As described in section 2.2.
Note (4): We are aware of extremely large errors in a few cases for b/a
and cmodel magnitudes, but these are the errors reported by
the SDSS pipeline.
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 6 I6 --- AGC [1/749512] AGC catalog identifier
8- 11 F4.2 mag Ag [0/1.91]? g band internal extinction
factor (1)
13- 16 F4.2 mag Ai [0/0.99]? i band internal extinction
factor (1)
18- 23 F6.2 mag iMAG [-24/-10]? Corrected absolute i band
magnitude (2)
25- 29 F5.2 mag e_iMAG [0.02/86]? Uncertainty in iMAG
31- 35 F5.2 mag g-i [-1.97/3.8]? Corrected (g-i) color (2)
37- 42 F6.2 mag e_g-i [0.03/220.3]? Uncertainty in g-i
44- 48 F5.2 [solMass] logMsT [4.49/12.45]? log Taylor method stellar
mass (3)
50- 55 F6.2 [solMass] e_logMsT [0.02/158]? Uncertainty in logMsT
57- 61 F5.2 [solMass] logMsM [4.4/11.94]? log McGaugh method stellar
mass (3)
63- 66 F4.2 [solMass] e_logMsM [0.01/1.66]? Uncertainty in logMsM
68- 72 F5.2 [solMass] logMsG [7.37/11.69]? log GSWLC-2 derived stellar
mass
74- 77 F4.2 [solMass] e_logMsG [0/0.25]? Uncertainty in logMsG
79- 83 F5.2 [solMass/yr] logSFR22 [-5.57/2.17]? log Star Formatation Rate
from 22µm unWISE photometry (4)
85- 88 F4.2 [solMass/yr] e_logSFR22 [0.01/3.6]? Uncertainty in logSFR22
90- 94 F5.2 [solMass/yr] logSFRN [-3.53/7.88]? log Star Formatation Rate
from GALEX NUV photometry (4)
96-100 F5.2 [solMass/yr] e_logSFRN [0.02/28.03]? Uncertainty in logSFRN
102-106 F5.2 [solMass/yr] logSFRG [-2.94/1.47]? log Star Formatation Rate
from GSWLC-2
108-111 F4.2 [solMass/yr] e_logSFRG [0.0/1.08]? Uncertainty in logSFRG
113-117 F5.2 [solMass] logMHI [3.76/10.94] Haynes+, 2018, J/ApJ/861/49
log HI mass
119-122 F4.2 [solMass] e_logMHI [0.0/1.12] Uncertainty in logMHI
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Note (1): As described in Section 2.2.
Note (2): Using SDSS cmodel magnitudes corrected for galactic and internal
extinction, as described in Section 2.2.
Note (3): As described in Sections 2.3 (Taylor method) and 3.1 (McGaugh method).
Note (4): As described in Section 3.2.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Coralie Fix [CDS], 15-Feb-2021