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J/ApJ/655/790       Groups of galaxies in 2MASS survey       (Crook+, 2007)

Groups of galaxies in the Two Micron All Sky redshift Survey. Crook A.C., Huchra J.P., Martimbeau N., Masters K.L., Jarrett T., Macri L.M. <Astrophys. J., 655, 790-813 (2007)> =2007ApJ...655..790C
ADC_Keywords: Clusters, galaxy ; Infrared sources ; Morphology Keywords: galaxies: clusters: general - galaxies: distances and redshifts - large-scale structure of universe Abstract: We present the results of applying a percolation algorithm to the initial release of the Two Micron All Sky Survey Extended Source Catalog, using subsequently measured redshifts for almost all of the galaxies with K<11.25mag. This group catalog is based on the first near-IR all-sky flux-limited survey that is complete to |b|=5°. We explore the dependence of the clustering on the length and velocity scales involved. The paper describes a group catalog, complete to a limiting redshift of 104km/s, created by maximizing the number of groups containing three or more members. A second catalog is also presented, created by requiring a minimum density contrast of δρ/ρ≥80 to identify groups. We identify known nearby clusters in the catalogs and contrast the groups identified in the two catalogs. We examine and compare the properties of the determined groups and verify that the results are consistent with the UZC-SSRS2 and northern CfA redshift survey group catalogs. The all-sky nature of the catalog will allow the development of a flow-field model based on the density field inferred from the estimated cluster masses. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table6.dat 99 1604 *Low-density-contrast (LDC) catalog of groups in the 2MASS Redshift Survey table7.dat 99 1261 *High-density-contrast (HDC) catalog of groups in the 2MASS Redshift Survey table8.dat 130 17 *Groups in the LDC Catalog with 50 or More Members table9.dat 130 27 *Groups in the HDC Catalog with 25 or More Members table10.dat 67 11837 *Groups in the LDC catalog and their members table11.dat 67 6900 *Groups in the HDC catalog and their members
Note on table6.dat, table10.dat: This catalog has been produced using parameters (D0,V0)=(1.04Mpc, 399km/s), corresponding to the density contrast δρ/ρ=12. Note on table7.dat, table11.dat: This catalog has been produced using parameters (D0,V0)=(0.56Mpc, 350km/s), corresponding to the density contrast δρ/ρ=80. Note on table8.dat: The LDC group catalog was created using (D0, V0)=(1.63Mpc, 399km/s), corresponding to the density contrast δρ/ρ=12. Note on table9.dat: This catalog has been produced using parameters (D0, V0)=(0.89Mpc, 350km/s), corresponding to the density contrast δρ/ρ=80.
See also: II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003) VII/28 : Southern Groups and Clusters of Galaxies (Duus, Newell 1977) VII/84 : Groups of Galaxies. III. The CfA Survey (Geller+ 1983) VII/86 : Groups of Galaxies. I. Nearby Groups (Huchra+ 1982) VII/89 : Compact groups of compact galaxies (Shakhbazian+ 1973-1979) VII/196 : Shakhbazian compact groups of galaxies (Stoll+ 1993-97) VII/213 : Hickson's Compact groups of Galaxies (Hickson+ 1982-1994) VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003) Byte-by-byte Description of file: table[67].dat
Bytes Format Units Label Explanations
1- 4 I4 --- Group Group number (1) 6- 7 I2 h RAh Hour of Right Ascension (J2000) 9- 10 I2 min RAm Minute of Right Ascension (J2000) 12- 15 F4.1 s RAs Second of Right Ascension (J2000) 17 A1 --- DE- Sign of the Declination (J2000) 18- 19 I2 deg DEd Degree of Declination (J2000) 21- 22 I2 arcmin DEm Arcminute of Declination (J2000) 24- 25 I2 arcsec DEs Arcsecond of Declination (J2000) 27- 29 I3 --- Nm Number of members in Group (2) 31- 33 I3 --- NmS Number of simulated members in Group 35- 40 F6.2 Mpc Dist Mean (corrected) group distance, assuming h=0.73 42- 46 I5 km/s HV Mean heliocentric group velocity 48- 53 F6.1 km/s sigma Line-of-sight velocity dispersion 55- 59 F5.2 Mpc Rp Projected virial radius 61- 66 F6.3 [solMass] logM Log of the virial mass 68- 73 F6.3 [solMass] logMp Log of the projected mass 75- 80 F6.3 [solMass/solLum] logM/L Log of projected mass-to-light ratio 82- 85 I4 arcmin a Semi-major axis of the ellipse fit (3) 87- 90 F4.2 --- b/a ? Axis ratio of group ellipse fit 92- 94 I3 deg PA ? Semi-major axis position angle (4) 96- 99 I4 --- LDC ? LDC catalog group number that includes all members of this group (for table7.dat only)
Note (1): For table6.dat: [CHM2007] LDC NNNN in Simbad For table7.dat: [CHM2007] HDC NNNN in Simbad Note (2): Including those generated from the population of the plane. Note (3): Fit to the group at the 75th-percentile level. Note (4): Measured from north toward east.
Byte-by-byte Description of file: table[89].dat
Bytes Format Units Label Explanations
1- 4 I4 --- Group Group number (1) 6- 7 I2 h RAh Right ascension (J2000) 9- 10 I2 min RAm Right ascension (J2000) 12- 15 F4.1 s RAs Right ascension (J2000) 17 A1 --- DE- Declination sign (J2000) 18- 19 I2 deg DEd Declination (J2000) 21- 22 I2 arcmin DEm Declination (J2000) 24- 25 I2 arcsec DEs Declination (J2000) 27- 29 I3 --- Nm Number of group members (including those generated from the population of the plane) 31- 32 I2 --- NmG Number of group members derived from the Galactic-plane population 34- 39 F6.2 Mpc Dist Mean (corrected) group distance, assuming h=0.73 41- 44 I4 km/s VG Mean heliocentric group velocity 46- 51 F6.1 km/s sigma Line-of-sight velocity dispersion 53- 57 F5.2 Mpc Rp Projected virial radius 59- 64 F6.3 [solMass] logM Virial mass 66- 71 F6.3 [solMass] logMp Projected mass 73- 77 F5.3 [solMass/solLum] logM/L Projected mass-to-light ratio 79- 82 I4 --- LDC ? Corresponding Group Number from LDC catalog that encompasses all members of this group, in table9.dat only 84-130 A47 --- Note Composition of group based on known galaxy clusters and superclusters
Note (1): For table8.dat: [CHM2007] LDC NNNN in Simbad For table9.dat: [CHM2007] HDC NNNN in Simbad
Byte-by-byte Description of file: table1?.dat
Bytes Format Units Label Explanations
1- 4 I4 --- Group Group number (1) 6- 22 A17 --- Name Member identification (2) 24- 25 I2 h RAh Hour of Right Ascension (J2000) 27- 28 I2 min RAm Minute of Right Ascension (J2000) 30- 33 F4.1 s RAs Second of Right Ascension (J2000) 35 A1 --- DE- Sign of the Declination (J2000) 36- 37 I2 deg DEd Degree of Declination (J2000) 39- 40 I2 arcmin DEm Arcminute of Declination (J2000) 42- 43 I2 arcsec DEs Arcsecond of Declination (J2000) 45- 49 I5 km/s HV Heliocentric velocity 51- 55 F5.2 mag Kmag 2MASS K band magnitude 57- 62 F6.2 Mpc Dist Corrected distance; assuming h = 0.73 64- 67 I4 --- Agrp ? Corresponding group number assigned to the galaxy when in the HDC (table10) or LCD (table11) catalog
Note (1): For table10.dat: [CHM2007] LDC NNNN in Simbad For table11.dat: [CHM2007] HDC NNNN in Simbad Note (2): For table10.dat: [CHM2007] LDC NNNN JHHMMSS.ss+DDMMSSs in Simbad For table11.dat: [CHM2007] HDC NNNN JHHMMSS.ss+DDMMSSs in Simbad
History: From electronic version of the journal Tables 6, 7, 10 and 11 from erratum ApJ, 685, 1320 (2008).
(End) Greg Schwarz [AAS], Patricia Vannier [CDS] 10-Dec-2008
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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