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 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:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 94 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 104 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
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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.
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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
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Bytes Format Units Label Explanations
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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)
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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.
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Byte-by-byte Description of file: table[89].dat
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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
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Note (1): For table8.dat: [CHM2007] LDC NNNN in Simbad
For table9.dat: [CHM2007] HDC NNNN in Simbad
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Byte-by-byte Description of file: table1?.dat
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Bytes Format Units Label Explanations
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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
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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
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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