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J/ApJ/843/16           Galaxy groups within 3500km/s           (Kourkchi+, 2017)

Galaxy groups within 3500 km/s. Kourkchi E., Tully R.B. <Astrophys. J., 843, 16 (2017)> =2017ApJ...843...16K
ADC_Keywords: Galaxies, optical ; Radial velocities ; Velocity dispersion ; Photometry, infrared Keywords: dark matter; galaxies: groups: general; galaxies: luminosity function, mass function Abstract: A study of the group properties of galaxies in our immediate neighborhood provides a singular opportunity to observationally constrain the halo mass function, a fundamental characterization of galaxy formation. Detailed studies of individual groups have provided the coefficients of scaling relations between a proxy for the virial radius, velocity dispersion, and mass that usefully allow groups to be defined over the range 1010-1015M. At a second hierarchical level, associations are defined as regions around collapsed halos extending to the zero-velocity surface at the decoupling from cosmic expansion. The most remarkable result of the study emerges from the construction of the halo mass function from the sample. At ∼1012M, there is a jog from the expectation Sheth-Tormen function, such that halo counts drop by a factor ∼3 in all lower mass bins. Description: We construct an all-sky sample of 15004 galaxies in groups with VLS<3500km/s. There are 1536 groups with two or more members involving 7714 galaxies. See sections 3 and 10 for further explanations. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 124 8826 Catalog of galaxy groups table3.dat 141 15004 Catalog of galaxies and their groups table4.dat 58 885 Catalog of group associations
See also: VII/86 : Groups of Galaxies. I. Nearby Groups (Huchra+ 1982) VII/84 : Groups of Galaxies. III. The CfA Survey (Geller+ 1983) VII/172 : First Byurakan Survey (FBS) (Markarian+, 1989) J/AJ/112/2471 : The Ursa Major cluster. I. (Tully+ 1996) J/A+A/327/952 : Centaurus cluster velocities (Stein+ 1997) J/A+AS/127/409 : New nearby dwarf galaxy candidates (Karachentseva+ 1998) J/ApJ/543/178 : Nearby Optical Galaxy (NOG) sample (Giuricin+, 2000) J/AJ/123/2976 : The UZC-SSRS2 group catalog (Ramella+, 2002) J/MNRAS/348/866 : 2dFGRS Percolation-Inferred Galaxy Group (2PIGG) (Eke+, 2004) J/MNRAS/369/1351 : Velocities in the possible Eridanus group (Brough+, 2006) J/MNRAS/369/1375 : Dwarf galaxies in NGC 1407 Group (Trentham+, 2006) J/ApJ/655/790 : Groups of galaxies in 2MASS survey (Crook+, 2007) J/ApJ/659/122 : Improved distances to type Ia supernovae (Jha+, 2007) J/ApJ/655/144 : ACS Virgo Cluster Survey. XIII. (Mei+, 2007) J/ApJ/676/184 : Peculiar motion away from the Local Void (Tully+, 2008) J/AJ/138/332 : LEDA CMD/tip of the red giant branch (Jacobs+, 2009) J/ApJ/737/86 : UCD galaxies in the Coma cluster (Chiboucas+, 2011) J/AJ/142/170 : the α.40 HI source catalog (Haynes+, 2011) J/ApJ/743/123 : Motions of galaxies in Coma I cloud (Karachentsev+, 2011) J/MNRAS/416/2840 : The 2M++ galaxy redshift catalogue (Lavaux+, 2011) J/MNRAS/412/2498 : Gal. groups & clouds in the local universe (Makarov+, 2011) J/ApJS/199/26 : The 2MASS Redshift Survey (2MRS) (Huchra+, 2012) J/AJ/145/101 : Updated nearby galaxy catalog (Karachentsev+, 2013) J/MNRAS/429/2264 : Galaxies in the UMa cluster complex (Karachentsev+, 2013) J/AJ/146/86 : Cosmicflows-2 catalog (Tully+, 2013) J/ApJ/812/158 : Leo P RR Lyrae candidates & cumulative SFH (McQuinn+, 2015) J/AJ/149/171 : 2MASS galaxy group catalog (Tully, 2015) J/AJ/151/52 : The HIZOA-S survey (Staveley-Smith+, 2016) J/AJ/152/50 : Cosmicflows-3 catalog (CF3) (Tully+, 2016) http://edd.ifa.hawaii.edu/ : The Extragalactic Distance Database (EDD) http://leda.univ-lyon1.fr/ : HyperLeda home page (Principal Galaxies Catalog identifiers) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 7 I7 --- PGC1 [35/9002824] Group Principal Galaxies Catalog ID (1) 9- 15 I7 --- PGC1+ [38/9002824] Association Principal Galaxies Catalog ID (2) 17- 19 I3 --- Nm [1/714] Number of galaxies in the group 21- 28 F8.4 deg GLON Galactic longitude 30- 37 F8.4 deg GLAT Galactic latitude 39- 46 F8.4 deg SGLON Supergalactic longitude 48- 55 F8.4 deg SGLAT Supergalactic latitude 57- 61 F5.2 mag Ksmag [1.2/21] Total Ks band apparent magnitude (3) 63- 67 F5.2 [Lsun] logK [1.7/13]? log Ks band absolute luminosity of group 69- 72 I4 km/s HRV [-332/3792] Heliocentric radial velocity of group (G1) 74- 77 I4 km/s VLS [-159/3500] Radial velocity of group relative to Local Sheet (G1) 79- 81 I3 --- Nd [0/170] Number of group members with measured distances (4) 83- 87 F5.2 Mpc Dist [0.01/94.2]? Distance of group (G2) 89- 90 I2 % e_Dist [3/25]? Percentage uncertainty in Dist (G3) 92- 94 I3 km/s sigmaL [1/610] Group velocity dispersion from luminosity (5) 96- 98 I3 km/s sigmaV [0/800] Group line-of-sight velocity dispersion (6) 100-104 F5.3 Mpc R2t [0.003/1.7] Second turnaround radius of group from luminosity (7) 106-110 F5.3 Mpc Rg [0.001/8.3]? Projected virial radius of group (8) 112-117 F6.3 [Msun] logMK [6.5/15] log of group mass from luminosity (9) 119-124 F6.3 [Msun] logMd [2.5/15]? log of group dynamic mass (10)
Note (1): In our catalog based on the PGC ID of the most luminous galaxy of the group from which the clustering process is started. Note (2): Of the group parent association. Note (3): Based on the integration of the Ks-band luminosity of all galaxies in group. From the 2MRS11.75 catalog (Huchra+ 2012, J/ApJS/199/26), we have at least the coverage of all galaxies brighter than Ks=11.75mag. Note (4): In the Cosmicflows-3 (CF3) catalog (Tully+ 2016, J/AJ/152/50). Note (5): Based on the mass estimate from total luminosity, Equation 7: Mν=2.0x106σ3p Note (6): Calculated based on the radial velocities of its members, Equation 3: σp=(Σii-<ν>)2/N)0.5 Note (7): Based on their luminosity mass, Equation 6: R2t=0.215M121/3 where M12=Mν/1012M Note (8): Based on Equation 4: Rg=N2/(Σi>j1/Rij) where Rg is the projected group radius, Rij is the projected distance between galaxy pairs, N is the number of group candidates, and each pair is counted only once. Note (9): Derived from the Ks-band luminosity by using M/L ratios given in Equation 8. Note (10): Calculated from virial radius and dynamical velocity dispersion using Equation 5: Mν23Drg/G=(απ/2G)σ2pRg where σ3D is the three-dimensional velocity dispersion, σ3D=α0.5^σp. The parameter α depends on the degree of virialization of orbits, and following Tully (2015AJ....149...54T), we assume α=2.5.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 7 I7 --- PGC [35/9002850] Principal Galaxies Catalog identifier 9- 36 A28 --- Name Common galaxy identifier 38- 45 F8.4 deg RAdeg Right Ascension in decimal degrees (J2000) 47- 54 F8.4 deg DEdeg Declination in decimal degrees (J2000) 56- 63 F8.4 deg GLON Galactic longitude 65- 72 F8.4 deg GLAT Galactic latitude 74- 81 F8.4 deg SGLON Supergalactic longitude 83- 90 F8.4 deg SGLAT Supergalactic latitude 92- 95 F4.1 --- TT [-5/10]? Morphological classification (1) 97-101 F5.2 mag Bmag [0.4/23.3]? Apparent B band magnitude from LEDA or NED 103-107 F5.2 mag Ksmag [-8.4/21] Apparent Ks band magnitude (2) 109-113 F5.2 [Lsun] logK [1.7/12]? log Ks band absolute luminosity of group 115-118 I4 km/s HRV [-999/5330] Heliocentric radial velocity of group (G1) 120-123 I4 km/s VLS [-999/5066] Radial velocity of group relative to the Local Sheet (G1) 125-130 F6.2 Mpc Dist [0.01/131]? Distance of group (G2) 132-133 I2 % e_Dist [1/25]? Percentage uncertainty in Dist (G3) 135-141 I7 --- PGC1 [35/9002824] Group Principal Galaxies Catalog identifier (3)
Note (1): In the Third Reference Catalogue (VII/155) format, with negative numbers assigned to early type galaxies and positive numbers to late type galaxies. Note (2): From the Extragalactic Distance Database (EDD; see http://edd.ifa.hawaii.edu/). Note (3): For the isolated galaxies, PGC and PGC1 IDs are the same.
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 7 I7 --- PGC1+ Association Principal Galaxies Catalog ID (1) 9- 16 F8.4 deg SGLON Supergalactic longitude 18- 25 F8.4 deg SGLAT Supergalactic latitude 27- 31 F5.2 [Lsun] logK [6.4/13.2] log Ks band absolute luminosity 33- 36 I4 km/s VLS [-24/3493] Radial velocity relative to the Local Sheet (G1) 38- 42 F5.2 Mpc Dist [0.01/58]? Distance (G2) 44- 45 I2 % e_Dist [3/25]? Percentage uncertainty in Dist (G3) 47- 51 F5.3 Mpc R1t [0.1/8.6] Estimated 3 dimensional first turnaround radius 53- 58 F6.3 [Msun] logMK [9.8/15]? log of integrated mass from luminosity (2)
Note (1): Of the most luminous galaxy group inside the association. Note (2): Of all member groups, where mass is derived from the Ks-band luminosity of Table 2.
Global notes: Note (G1): Calculated by unweighted averaging the radial velocity of their member galaxies. Note (G2): Based on the weighted averaged distance moduli of any members available in the Cosmicflows-3 (CF3; Tully+ 2016, J/AJ/152/50) distance catalog. Note (G3): In recognition of systematics, a minimum to errors is set at 3%.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 02-Feb-2018
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