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J/AJ/149/171               2MASS galaxy group catalog              (Tully, 2015)

Galaxy groups: a 2MASS catalog. Tully R.B. <Astron. J., 149, 171 (2015)> =2015AJ....149..171T
ADC_Keywords: Clusters, galaxy ; Galaxy catalogs ; Space velocities ; Photometry, infrared ; Velocity dispersion ; Morphology ; Cross identifications Keywords: dark matter - galaxies: clusters: general - galaxies: luminosity function, mass function - large-scale structure of universe Abstract: A galaxy group catalog is built from the sample of the 2MASS Redshift Survey almost complete to Ks=11.75 over 91% of the sky. Constraints in the construction of the groups were provided by scaling relations determined by close examination of well defined groups with masses between 1011 and 1015M. Group masses inferred from Ks luminosities are statistically in agreement with masses calculated from application of the virial theorem. While groups have been identified over the full redshift range of the sample, the properties of the nearest and farthest groups are uncertain and subsequent analysis has only considered groups with velocities between 3000 and 10000km/s. The 24044 galaxies in this range are identified with 13607 entities, 3461 of them with two or more members. A group mass function is constructed. The Sheth-Tormen formalism provides a good fit to the shape of the mass function for group masses above 6h-1x1012M but the count normalization is poor. Summing all the mass associated with the galaxy groups between 3000 and 10000km/s gives a density of collapsed matter as a fraction of the critical density of Ωcollapsed=0.16. Description: A galaxy group catalog is built from the sample of the 2MASS Redshift Survey almost complete to Ks=11.75 (Huchra et al. 2012, cat. J/ApJS/199/26) over 91% of the sky. The final affiliations of galaxies are called "nests." File Summary: File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 90 25474 Nest properties table4.dat 69 43038 Nest members table5.dat 269 43038 Combined Catalog
See also: VII/237 : HYPERLEDA. I. Catalog of galaxies (Paturel+, 2003) VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006) VII/155 : Third Reference Cat. of Bright Galaxies (RC3) (de Vaucouleurs+ 1991) VII/84 : Groups of Galaxies. III. The CfA Survey (Geller+ 1983) VII/86 : Groups of Galaxies. I. Nearby Groups (Huchra+ 1982) J/AJ/146/86 : Cosmicflows-2 catalog (Tully+, 2013) J/ApJS/199/26 : The 2MASS Redshift Survey (2MRS) (Huchra+, 2012) J/MNRAS/412/2498 : Galaxy groups and clouds in local universe (Makarov+, 2011) J/MNRAS/416/2840 : The 2M++ galaxy redshift catalogue (Lavaux+, 2011) J/ApJ/676/184 : Peculiar motion away from the Local Void (Tully+, 2008) J/ApJ/655/790 : Groups of galaxies in 2MASS survey (Crook+, 2007) J/MNRAS/348/866 : 2dFGRS Percolation-Inferred Galaxy Group (Eke+, 2004) J/AJ/123/2976 : The UZC-SSRS2 group catalog (Ramella+, 2002) http://edd.ifa.hawaii.edu/ : The Extragalactic Distance Database (EDD) Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 2 I2 --- f_Nest Hemisphere (1=in north galactic hemisphere, 2=in south, 12 or 22 if the group is a split from an adjacent larger group) 4- 9 I6 --- Nest [100001/220041] Group (nest) identification number (G1) 11- 13 I3 --- Nmb [1/197] Number of members from the 2MASS 11.75 catalog (Huchra et al. 2012, cat. J/ApJS/199/26) 15- 21 I7 --- PGC1 [5/5061293] Number in Principal Galaxies Catalog for brightest member in group 23- 30 F8.4 deg SGLON Group supergalactic longitude, luminosity weighted 32- 39 F8.4 deg SGLAT Group supergalactic latitude, luminosity weighted 41- 45 F5.2 [Lsun] logLK [4.5/14.32] Log Ks band luminosity (G2) 47- 51 I5 km/s <Vcmba> [7/23996] Unweighted average adjusted CMB reference frame group velocity (G3) 53- 57 F5.2 mag DM [19.23/36.9] Distance Modulus (G4) 59- 62 I4 km/s sigV [0/3403] Line Of Sight (LOS) bi-weight velocity dispersion of group members σV (1) 64- 68 F5.3 Mpc R2t [0/5.225] Projected radius of second turnaround R2t (G5) 70- 73 I4 km/s sigP [1/2566] Line Of Sight (LOS) velocity dispersion σp (G6) 75- 83 E9.3 Msun Mlum Group mass calculated from luminosity (2) 85- 90 F6.2 --- CF [1/173.24] Conversion factor (G7)
Note (1): Requires at least 5 group members. Note (2): Adjusted by correction factor, and assumed light to mass conversion factor (CF).
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 2 I2 --- f_Nest Hemisphere (1=in north galactic hemisphere, 2=in south, 12 or 22 if the group is a split from an adjacent larger group) 4- 9 I6 --- Nest [100001/220041] Group (nest) identification number (G1) 11- 17 I7 --- PGC [2/5061296] Number in Principal Galaxies Catalog for group member 19- 26 F8.4 deg SGLON Supergalactic longitude of galaxy 28- 35 F8.4 deg SGLAT Supergalactic latitude of galaxy 37- 40 F4.1 --- Mt [-5/10]?=99 Morphological type in the numeric code of de Vaucouleurs et al. 1991 (cat. VII/155) 42- 46 F5.2 mag Kmag [3.8/11.8] 2MASS Ks-band total magnitude, extinction corrected 48- 52 F5.2 mag J-H 2MASS (J-H) total extinction corrected color index 54- 57 F4.2 mag J-K 2MASS (J-K) total extinction corrected color index 59- 63 F5.2 [Lsun] logLKi [4.48/12.03] Log intrinsic Ks-band luminosity (G8) 65- 69 I5 km/s Vcmba [7/23996] Adjusted CMB reference frame velocity of galaxy (G3)
Byte-by-byte Description of file: table5.dat
Bytes Format Units Label Explanations
1- 7 I7 --- PGC [2/5061296] Number in Principal Galaxies Catalog (1) 9- 16 F8.4 deg GLON Galaxy Galactic longitude 18- 25 F8.4 deg GLAT Galaxy Galactic latitude 27- 34 F8.4 deg SGLON Galaxy Supergalactic longitude 36- 43 F8.4 deg SGLAT Galaxy Supergalactic latitude 45- 48 F4.1 --- MType [-5/99] Morphological type in the numeric code of de Vaucouleurs et al. 1991 (cat. VII/155) 50- 54 I5 km/s HV [-282/67860] Galaxy heliocentric velocity 56- 60 I5 km/s Vls [-373/67787] Galaxy velocity in local sheet reference frame (2) 62- 66 I5 km/s Vcmba [7/23996] Adjusted CMB reference frame velocity of galaxy (G3) 68- 72 F5.2 mag J-H 2MASS galaxy (J-H) total extinction corrected color index 74- 77 F4.2 mag J-K 2MASS galaxy (J-K) total extinction corrected color index 79- 83 F5.2 mag Kmag [3.8/11.75] 2MASS galaxy Ks-band total magnitude, extinction corected 85- 89 F5.2 [Lsun] logLKi [4.48/12.03] Log intrinsic Ks-band luminosity (G8) 91- 95 F5.2 [Lsun/Mpc3] logpK [8/12]? Log luminosity density (logρK) (3) 97- 98 I2 --- f_Nest ? Hemisphere (1=in north galactic hemisphere, 2=in south, 12 or 22 if the group is a split from an adjacent larger group) 100-105 I6 --- Nest [0/220041] Group (nest) identification number (G1) 107-109 I3 --- Nmb [1/197] Number of members from 2MASS 11.75 catalog (Huchra et al. 2012, cat. J/ApJS/199/26) 111-117 I7 --- PGC1 [5/5061293] Principal Galaxies Catalog number for brightest member in group 119-123 F5.1 Mpc Dist [0.1/240] Distance (G4) 125-129 F5.2 mag DM [19.23/36.9] Distance Modulus (G4) 131-138 F8.4 --- GSGLON Group Supergalactic longitude, luminosity weighted 140-147 F8.4 --- GSGLAT Group Supergalactic latitude, luminosity weighted 149-153 F5.2 [Lsun] logLK [4.5/14.32] Log Ks-band group luminosity (G2) 155-160 F6.2 --- CF [1/173.24] Conversion factor (G7) 162-165 I4 km/s sigP [0/2566] Line of sight velocity dispersion σp (G6) 167-171 F5.3 Mpc R2t [0/5.225] Projected radius of second turnaround (G5) 173-177 I5 km/s <Vcmba> [7/23996] Unweighted average adjusted CMB reference frame group velocity (G3) 179-183 I5 km/s Vbw [686/22323]? Bi-weight group velocity (Beers et al., 1990AJ....100...32B; requires at least 5 group members) (G3) 185-188 I4 km/s e_Vbw ? Uncertainty in Vbw 190-193 I4 km/s sigbw [6/2440]? Group line of sight bi-weight velocity dispersion (requires at least 5 group members) 195-198 I4 km/s sigV [0/3403] Group line of sight velocity dispersion (null if group of one) 200-204 F5.3 Mpc Rbw [0/6.63]? Bi-weight projected gravitational radius (requires at least 5 group members) 206-210 F5.3 Mpc e_Rbw ? Uncertainty in Rbw 212-220 F9.3 TMsun Mvir [0/30900]? Group mass from virial theorem (4) 222-230 F9.3 TMsun Mlum [0/25301] Group mass based on adjusted intrinsic luminosity & mass to light prescription 232-235 I4 --- HDC [0/1538] Identification of high density group in Crook et al. 2007 (cat. J/ApJ/655/790) 237-240 I4 --- LDC [0/1258] Identification of low density group in Crook et al. 2007 (cat. J/ApJ/655/790) 242-245 I4 --- 2M++ [0/4715] Group identification in Lavaux & Hudson 2011 (cat. J/MNRAS/416/2840) 247-253 F7.2 Mpc SGX ? SuperGalactic X coordinate (5) 255-261 F7.2 Mpc SGY ? SuperGalactic Y coordinate (5) 263-269 F7.2 Mpc SGZ ? SuperGalactic Z coordinate (5)
Note (1): All Galaxies with Group Tags. Also available (separated into Galactic north and south halves) at the Extragalactic Distance Database (http://edd.ifa.hawaii.edu/) with updates. Note (2): Frame defined by Tully et al. 2008 (cat. J/ApJ/676/184). Note (3): At nearest location on a 1h-1Mpc grid, where contributions come from all adjacent 2MASS 11.75 (Huchra et al. 2012, cat. J/ApJS/199/26) galaxies after smoothing with a Gaussian of 1h-1Mpc times an adjustment dependent on the luminosity correction factor as described in the text. Note (4): With bi-weight dispersion and radius parameters. Requires at least 5 group members. Note (5): From group velocities assuming H0=100km/s/Mpc, with small adjustments described in section 4.1 to create roughly spherical clusters.
Global Notes: Note (G1): Our final affiliations of galaxies are called "nests." Please refer to Section 4 in the paper for details about the construction of the group catalog. Note (G2): Summed over all 2MASS 11.75 (Huchra et al. 2012, cat. J/ApJS/199/26) members and adjusted by the correction factor for missing light. Note (G3): In the cosmic microwave background (CMB) frame adjusted by a cosmological model as described in Tully et al. 2013 (cat. J/AJ/146/86). Note (G4): From group velocity assuming H0=100km/s/Mpc. Note (G5): Calculated from group luminosity and assumed conversion to mass, at group distance given by velocity and H0=100 km/s/Mpc. Note (G6): Anticipated from group luminosity and assumed conversion to mass. Note (G7): For missing light as a function of systemic velocity. Note (G8): Extinction corrected, at group distance given by velocity and H0=100km/s/Mpc.
History: From electronic version of the journal
(End) Greg Schwarz [AAS], Sylvain Guehenneux [CDS] 29-May-2015
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