J/ApJ/835/280 WISE MIR properties of galaxies in compact groups (Lee+, 2017)
The fastest galaxy evolution in an unbiased compact group sample with WISE. Lee G.-H., Hwang H.S., Sohn J., Lee M.G. <Astrophys. J., 835, 280-280 (2017)> =2017ApJ...835..280L (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, IR ; Photometry, SDSS ; Photometry, infrared ; Redshifts Keywords: galaxies: evolution; galaxies: groups: general; galaxies: interactions Abstract: We study the mid-infrared (MIR) properties of galaxies in compact groups and their environmental dependence using the Wide-field Infrared Survey Explorer (WISE) data. We use a volume-limited sample of 670 compact groups and their 2175 member galaxies with Mr←19.77 and 0.01<z<0.0741, drawn from Sohn+ (2016, J/ApJS/225/23), which were identified using a friends-of-friends algorithm. Among the 2175 galaxies, 1541 galaxies are detected at WISE 12um with a signal-to-noise ratio greater than 3. Among the 1541 galaxies, 433 AGN-host galaxies are identified by using both optical and MIR classification schemes. Using the remaining 1108 non-AGN galaxies, we find that the MIR [3.4]- colors of compact group early-type galaxies are on average bluer than those of cluster early-type galaxies. When compact groups have both early- and late-type member galaxies, the MIR colors of the late-type members in those compact groups are bluer than the MIR colors of cluster late-type galaxies. As compact groups are located in denser regions, they tend to have larger early-type galaxy fractions and bluer MIR color galaxies. These trends are also seen for neighboring galaxies around compact groups. However, compact group member galaxies always have larger early-type galaxy fractions and bluer MIR colors than their neighboring galaxies. Our findings suggest that the properties of compact group galaxies depend on both internal and external environments of compact groups, and that galaxy evolution is faster in compact groups than in the central regions of clusters. Description: In this study, we use the V1 sample of 670 compact groups and their 2175 member galaxies from Sohn+ (2016, J/ApJS/225/23). To study the MIR properties of these galaxies, we cross-correlate the galaxies with the objects in the ALLWISE source catalog using a matching tolerance of 3", corresponding to about half of the FWHM of the PSF at 3.4um. Among the 2175 galaxies, 2067 (95%) are matched with ALLWISE sources. Because the ALLWISE magnitudes with S/N<2 are just upper limits, we choose only the galaxies with S/N>3 to safely use the magnitudes. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 93 2175 SDSS-related physical parameters of compact group galaxies table2.dat 84 2175 WISE-related physical parameters of compact group galaxies table3.dat 62 670 Environmental parameters of compact groups
See also: VII/85 : Hickson Compact Groups of Galaxies (Hickson 1982) V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012) II/328 : AllWISE Data Release (Cutri+ 2013) V/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015) J/ApJS/106/1 : EFAR cluster and galaxy selection (Wegner+, 1996) J/AJ/116/1529 : cD clusters of galaxies. III. (Hill+, 1998) J/ApJS/115/1 : MX northern Abell cluster redshift survey (Slinglendy+ 1998) J/ApJ/496/39 : Properties of poor groups of galaxies. I. (Zabludoff+ 1998) J/PASP/111/438 : Updated Zwicky catalog (UZC) (Falco+, 1999) J/MNRAS/305/259 : EFAR gal. redshifts & velocity dispersions (Wegner+, 1999) J/AJ/130/55 : Modelled Lick indices for galaxies (Mendes+, 2005) J/ApJ/646/133 : Redshifts in X-ray-selected groups of gal. (Mulchaey+, 2006) J/MNRAS/395/255 : Compact groups of galaxies in SDSS DR6 (McConnachie+, 2009) J/A+A/533/A142 : UV-to-IR fluxes of Hickson compact groups (Bitsakis+, 2011) J/MNRAS/418/1409 : Compact groups of galaxies in SDSS DR7 (Mendel+, 2011) J/ApJ/758/25 : Optical properties of WISE galaxies (Hwang+, 2012) J/A+A/539/A106 : DPOSS II compact group survey. EMMI-NTT sample (Pompei+, 2012) J/ApJ/767/15 : Hectospec Cluster Survey (HeCS) (Rines+, 2013) J/ApJ/775/129 : gri photometry in compact groups of galaxies (Walker+, 2013) J/ApJS/212/9 : X-ray sources in Hickson Compact Groups (Tzanavaris+, 2014) J/A+A/578/A61 : Galaxy groups in the 2M++ (Diaz-Gimenez+, 2015) J/ApJ/800/80 : MIR properties of galaxies in A2199 at z∼0.03 (Lee+, 2015) J/MNRAS/459/2948 : Ccompact group galaxies UV and IR SFR (Lenkic+, 2016) J/ApJS/225/23 : Compact groups of gal. from SDSS-DR12 (MLCG) (Sohn+, 2016) J/ApJ/821/113 : HCG & RSCG compact group galaxies with WISE (Zucker+, 2016) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Group Host compact group ID (G1) 9- 27 I19 --- Gal SDSS-DR9 galaxy objID 29- 38 F10.6 deg RAdeg Right Ascension of galaxy (J2000) 40- 49 F10.6 deg DEdeg Declination of galaxy (J2000) 51- 58 F8.6 --- z [0.01/0.08] Redshift of galaxy 60- 67 F8.6 --- e_z [/0.01] Error of redshift of galaxy 69- 74 F6.2 mag rMag [-24.3/-19.7] SDSS r band absolute magnitude (1) 76- 79 F4.2 mag e_rMag [0.01/2.3] Error in rMag 81- 85 F5.2 mag u-r [0.1/16.4] Extinction-corrected SDSS (u-r) AB color index (2) 87- 91 F5.2 mag e_u-r [0.01/12] Error of (u-r) color index 93 I1 --- M [1/2] Morphology class (1=early-type galaxy; 2=late-type galaxy)
Note (1): The k-, and evolution-corrected r-band Petrosian absolute magnitudes. Note (2): The SDSS extinction- and k-corrected model magnitudes.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Group Host compact group ID (G1) 9- 27 I19 --- Gal SDSS-DR9 galaxy objID 29- 33 F5.2 mag 3.4-12 [-2.6/3]?=-9.99 WISE [3.4]- micron AB color index (3) 35- 38 F4.2 mag e_3.4-12 [0/0.4] Error in 3.4-12 (4) 40- 43 F4.1 --- SNR12 [-3/83]?=-9.9 Signal-to-noise ratio in WISE 12um band (4) 45- 49 F5.2 [Lsun] logL12 [7.4/11]?=-9.99 Log WISE 12um band luminosity 51- 54 F4.2 [Lsun] e_logL12 [0/0.2] Error in logL12 (4) 56 I1 --- AGN [0/3] AGN class (0=non-AGN) (5) 58- 63 F6.2 mag 3.4Mag [-26.3/-20.7]?=-9.99 WISE 3.4um band absolute magnitude 65- 68 F4.2 mag e_3.4Mag [0.02/0.3]?=0 Error in 3.4Mag 70- 74 F5.2 [Msun] logMass [8/15]?=0 Log stellar mass (6) 76- 79 F4.2 [Msun] e_logMass [0.03/0.3]?=0 Lower error of Log stellar mass 81- 84 F4.2 [Msun] E_logMass [0.02/0.5]?=0 Upper error of Log stellar mass
Note (3): The ALLWISE profile-fitting AB magnitudes. Note (4): When (S/N)12≤3, we assign zero errors to [3.4]- and log(L12/L☉). Note (5): AGN classification (0: non-AGN, 1: optical AGN, 2: MIR AGN, and 3: optical+MIR AGN) Note (6): Stellar masses calculated using H0=70km/s/Mpc.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 7 A7 --- Group Compact Group ID (G1) 9- 18 F10.6 deg RAdeg Right Ascension of compact group (J2000) (1) 20- 29 F10.6 deg DEdeg Declination of compact group (J2000) (1) 31- 36 F6.4 --- z [0.01/0.08] Redshift of compact group (1) 38- 43 F6.4 --- e_z [0.0001/0.002] Error in z (1) 45 I1 --- Nmm [3/8] Number of member galaxies in each compact group 47- 49 I3 --- Nn [0/63]?=-99 Number of neighboring galaxies in the comoving cylinder (2) 51- 54 F4.2 --- ETf [0/1] Fraction of early-type member galaxies (3) 56- 58 I3 km/s sigma [2/879] Velocity dispersion of compact group (4) 60- 62 I3 km/s e_sigma 1σ error in sigma (4)
Note (1): From table 5 of Sohn+, 2016, J/ApJS/225/23 Note (2): The number of neighboring galaxies (M_r←19.77) in the comoving cylinder. For 59 compact groups near the lower and upper redshift limits, Nn are not assigned. Note (3): The fraction of early-type galaxies among member galaxies of a compact group. Note (4): The rest-frame line-of-sight velocity dispersion of galaxies in each compact group and the 1sigma error derived from 1000-times bootstrap resamplings, from Table 5 of Sohn+ (2016, J/ApJS/225/23).
Global note: Note (G1): Group ID from Table 5 of Sohn+ (2016, J/ApJS/225/23)
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 04-Sep-2017
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