J/ApJS/225/23 Compact groups of galaxies from SDSS-DR12 (MLCG) (Sohn+, 2016)
Catalogs of compact groups of galaxies from the enhanced SDSS DR12.
Sohn J., Geller M.J., Hwang H.S., Zahid H.J., Lee M.G.
<Astrophys. J. Suppl. Ser., 225, 23-23 (2016)>
=2016ApJS..225...23S 2016ApJS..225...23S (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, spectra ; Redshifts ; Velocity dispersion ;
Photometry, SDSS
Keywords: catalogs; galaxies: evolution; galaxies: groups: general;
galaxies: interactions; surveys
Abstract:
We apply a friends-of-friends algorithm to an enhanced SDSS DR12
spectroscopic catalog, including redshift from the literature to
construct a catalog of 1588 N≥3 compact groups of galaxies containing
5178 member galaxies and covering the redshift range 0.01<z<0.19. This
catalog contains 18 times as many systems and reaches 3 times the
depth of the similar catalog of Barton et al. (1996AJ....112..871B 1996AJ....112..871B).
We construct catalogs from both magnitude-limited and volume-limited
galaxy samples. Like Barton et al. we omit the frequently applied
isolation criterion in the compact group selection algorithm. Thus the
groups selected by fixed projected spatial and rest-frame
line-of-sight velocity separation produce a catalog of groups with a
redshift-independent median size. In contrast to previous catalogs,
the enhanced SDSS DR12 catalog (including galaxies with r<14.5)
includes many systems with z≲0.05. The volume-limited samples are
unique to this study. The compact group candidates in these samples
have a median stellar mass independent of redshift. Groups with
velocity dispersion ≲100km/s show abundant evidence for ongoing
dynamical interactions among the members. The number density of the
volume-limited catalogs agrees with previous catalogs at the lowest
redshifts but decreases as the redshift increases. The SDSS fiber
placement constraints limit the catalog's completeness. In spite of
this issue, the volume-limited catalogs provide a promising basis for
detailed spatially resolved probes of the impact of galaxy-galaxy
interactions within similar dense systems over a broad redshift range.
Description:
We derive a sample of compact groups from the spectroscopic sample of
SDSS DR12 (Alam et al. 2015ApJS..219...12A 2015ApJS..219...12A) galaxies at r<17.77. The
DR12 includes redshifts for more than 2.4 million galaxies. To reduce
the incompleteness of the SDSS, we supplement the catalog with
redshifts from the literature (see Hwang et al. 2010A&A...522A..33H 2010A&A...522A..33H
for details). We also add redshifts from recent FAST observations at
Fred Lawrence Whipple Observatory (Sohn et al. 2015JKAS...48..381S 2015JKAS...48..381S).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 96 1588 Catalog of SDSS DR12 magnitude-limited redshift
sample of candidate compact groups (MLCGs)
table3.dat 103 5178 Catalog of MLCG members
table5.dat 77 670 Catalog of V1CGs (volume-limited sample 1 with
0.01≤z≤0.0754 and rMag≥-19mag)
table6.dat 77 297 Catalog of V2CGs (volume-limited sample 2 with
0.01≤z≤0.1154 and rMag≥-20mag)
table8.dat 31 294 Catalog of system containing a
dominant galaxy surrounded by satellites
table9.dat 62 964 Catalog of galaxies in the system containing a
dominant galaxy surrounded by satellites
table10.dat 31 109 Catalog of system with low surface brightness
table11.dat 62 539 Catalog of galaxies in systems with
low surface brightness
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See also:
VII/213 : Hickson's Compact groups of Galaxies (Hickson+ 1982-1994)
VII/86 : Groups of Galaxies. I. Nearby Groups (Huchra+ 1982)
J/ApJ/821/113 : HCG and RSCG compact group galaxies with WISE (Zucker+, 2016)
J/A+A/578/A61 : Galaxy groups in the 2M++ (Diaz-Gimenez+, 2015)
J/MNRAS/449/2937 : HST BVI catalog of star clusters in 5 HCGs (Fedotov+, 2015)
J/ApJS/213/35 : SHELS: complete galaxy redshift R≤20.6 survey (Geller+, 2014)
J/A+A/566/A1 : Flux- and volume-limited groups for SDSS gal. (Tempel+, 2014)
J/A+A/565/A25 : Hickson compact groups Herschel observations (Bitsakis+, 2014)
J/ApJ/767/15 : Hectospec Cluster Survey (HeCS) (Rines+, 2013)
J/MNRAS/426/296 : Compact Groups of galaxies from 2MASX (Diaz-Gimenez+, 2012)
J/A+A/540/A96 : Molecular gas in HCGs (Martinez-Badenes+, 2012)
J/A+A/539/A106 : DPOSS II compact group survey. EMMI-NTT sample (Pompei+, 2012)
J/MNRAS/418/1409 : Compact groups of galaxies in SDSS DR7 (Mendel+, 2011)
J/A+A/533/A142 : UV-to-IR fluxes of Hickson compact groups (Bitsakis+, 2011)
J/AJ/139/1857 : Sample of major galaxy pairs at z=0.08-0.38 (Woods+, 2010)
J/A+A/514/A102 : SDSS DR7 groups of galaxies (Tago+, 2010)
J/MNRAS/395/255 : Compact groups of galaxies in SDSS DR6 (McConnachie+, 2009)
J/AJ/130/425 : Catalog of distant compact groups of gal. (De Carvalho+, 2005)
J/AJ/127/1811 : Catalog of SDSS compact groups of galaxies (Lee+, 2004)
J/AJ/125/1660 : Distant compact groups from DPOSS (Iovino+, 2003)
J/A+A/391/35 : Compact Groups in the UZC galaxy sample (Focardi+, 2002)
J/AN/321/101 : Compact groups of galaxies in LCRS (Allam+, 2000)
J/ApJ/399/353 : Radial velocities in Hickson compact groups (Hickson+ 1992)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [MLCG]
5- 8 I04 --- MLCG Compact Group ID
10- 19 F10.6 deg RAdeg Right Ascension of compact group in
decimal degrees (J2000)
21- 30 F10.6 deg DEdeg Declination of compact group in decimal
degrees (J2000)
32- 32 I1 --- Nm [3/8] Number of member galaxies
34- 39 F6.4 --- z [0.01/0.19] Redshift of compact group
41- 46 F6.4 --- e_z [0/0.002] Redshift uncertainty of
compact group (G2)
48- 51 F4.1 kpc Rad [4.9/94.1] Group size of compact group
53- 56 F4.1 kpc e_Rad [0.1/17] Group size uncertainty of
compact group (G2)
58- 61 F4.2 [Mpc-3] Den [3.2/7] Number density of groups in log scale
63- 66 F4.2 [Mpc-3] e_Den [0/1.5] Number density uncertainty of groups
in log scale (G2)
68- 70 I3 km/s sigma [1/879] Velocity dispersion of compact group
72- 74 I3 km/s e_sigma [0/228] Velocity dispersion uncertainty of
compact group
76- 78 I3 --- Nc [/27]?=-99 Number of neighboring galaxies
in a comoving cylinder (2)
80- 80 A1 --- sset [NS] Designations for groups
(S= group containing a sub-group) (3)
82- 88 A7 --- V1sset V1 CG subsample ID
90- 96 A7 --- V2sset V2 CG subsample ID
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Note (2): Number of neighboring galaxies in a comoving cylinder of
ΔR<700.h-1.kpc and rest frame |ΔV|<1000km/s
Note (3): Designations for groups that contain sub-groups identified with a
tighter radial linking length of |ΔV|<500 km/s:
S = a group containing a sub-groups;
N = a group with no tighter subgroup.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- --- [MLCG]
5- 8 I04 --- MLCG Compact Group ID
10- 28 A19 --- GalID Member Object ID from SDSS DR12
30- 39 F10.6 deg RAdeg Right Ascension of member (J2000)
41- 50 F10.6 deg DEdeg Declination of member (J2000)
52- 52 I1 --- MT [1/2] Galaxy morphology
(1=early type; 2=late type)
54- 58 F5.2 mag rmag [11.5/18.2] SDSS extinction- and
k-corrected model magnitudes
60- 64 F5.2 mag u-r [0.03/16.4] SDSS extinction- and
k-corrected u-r color index
66- 71 F6.4 --- z [0.01/0.2] Redshift of member galaxy
73- 79 F7.5 --- e_z [0/0.01] Redshift uncertainty of member galaxy
81- 86 F6.3 [Msun] Mstar [7.5/11.9]? Stellar mass of member galaxy
in log scale
88- 92 F5.3 [Msun] E_Mstar [0.03/0.5]?=0 Upper uncertainty of Mstar
94- 98 F5.3 [Msun] e_Mstar [0.03/0.4]?=0 Lower uncertainty of Mstar
100-103 A4 --- r_z The source of redshift: BOSS,FLWO,NED,SDSS
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- V1sset V1CG ID (G1)
9- 18 F10.6 deg RAdeg Right Ascension of V1 compact group (J2000)
20- 29 F10.6 deg DEdeg Declination of V1 compact group (J2000)
31 I1 --- Nm [3/8] Number of member galaxies in
V1 compact group
33- 38 F6.4 --- z [0.01/0.08] Redshift of V1 compact group
40- 45 F6.4 --- e_z [0/0.002] Redshift uncertainty (G2)
47- 50 F4.1 kpc Rad [4.9/94.1] Group size of V1 compact group
52- 55 F4.1 kpc e_Rad [0.2/12] Rad uncertainty (G2)
57- 60 F4.2 [Mpc-3] Den [3.3/6.8] Number density of V1 groups
in log scale
62- 65 F4.2 [Mpc-3] e_Den [0.01/1.1] Den uncertainty
67- 69 I3 km/s sigma [2/879] Velocity dispersion of V1 compact group
71- 73 I3 km/s e_sigma [1/228] sigma uncertainty
75- 77 I3 --- Nc [/23]?=-99 Number of neighboring galaxies in a
comoving cylinder
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- V2sset V2CG ID (G1)
9- 18 F10.6 deg RAdeg Right Ascension of V2 compact group (J2000)
20- 29 F10.6 deg DEdeg Declination of V2 compact group (J2000)
31 I1 --- Nm [3/5] Number of member galaxies in
V2 compact group
33- 38 F6.4 --- z [0.01/0.12] Redshift of V2 compact group
40- 45 F6.4 --- e_z [0/0.002] Redshift uncertainty (G2)
47- 50 F4.1 kpc Rad [5.8/66.3] Group size of V2 compact group
52- 55 F4.1 kpc e_Rad [0.1/16.1] Rad uncertainty (G2)
57- 60 F4.2 [Mpc-3] Den [3.6/6.6] Number density of V2 groups
in log scale
62- 65 F4.2 [Mpc-3] e_Den [0/1.3] Den uncertainty
67- 69 I3 km/s sigma [10/781] Velocity dispersion of
V2 compact group
71- 73 I3 km/s e_sigma [2/204] sigma uncertainty
75- 77 I3 --- Nc [/22]?=-99 Number of neighboring galaxies in
a comoving cylinder
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Byte-by-byte Description of file: table8.dat table10.dat
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Bytes Format Units Label Explanations
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1- 10 F10.6 deg RAdeg Right Ascension of system (J2000)
12- 21 F10.6 deg DEdeg Declination of system (J2000)
23- 24 I2 --- Nm [3/13]? Number of member
26- 31 F6.4 --- z [0.008/0.09] Redshift of system
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Byte-by-byte Description of file: table9.dat table11.dat
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Bytes Format Units Label Explanations
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1- 19 I19 --- GalID Member Object ID from SDSS DR12
21- 30 F10.6 deg RAdeg Right Ascension of member (J2000)
32- 41 F10.6 deg DEdeg Declination of member (J2000)
43- 47 F5.2 mag rmag [11.3/18] SDSS extinction- and
k-corrected model magnitudes
49- 54 F6.4 --- z [0.008/0.09] Redshift of member
56- 62 F7.5 --- e_z [0/0.001] Redshift uncertainty of member
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Global notes:
Note (G1): Member galaxies are contained in the MLCG galaxy catalog (Table 3)
Note (G2): The error is the 1σ deviation derived from 1000 times
bootstrap resamplings.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 10-Oct-2016