J/A+A/578/A61 Galaxy groups in the 2M++ (Diaz-Gimenez+, 2015)
Where are compact groups in the local Universe?
Diaz-Gimenez E., Zandivarez A.
<Astron. Astrophys. 578, A61 (2015)>
=2015A&A...578A..61D 2015A&A...578A..61D
ADC_Keywords: Surveys ; Clusters, galaxy; Radial velocities ;
Velocity dispersion
Keywords: methods: numerical - methods: statistical - galaxies: groups: general
Abstract:
We provide the galaxy group sample used as tracers of the large scale
structure in the work to study the compact group environment.
Description:
File tableb1 contains the 813 galaxy groups identified in the 2M++
catalogue with a FoF algorithm with an overdensity contrast of 433,
and having virial masses greater than 1012 solar masses, and four or
more galaxy members.
File tableb2 contains information about the 4869 galaxy group members
with K_2M++ apparent magnitude brighter than 12.5.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
tableb1.dat 53 813 Table of galaxy groups
tableb2.dat 41 4869 Table of galaxies in groups
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See also:
J/MNRAS/416/2840 : The 2M++ galaxy redshift catalogue (Lavaux+, 2011)
Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID [1/813] Group ID
5- 6 I2 --- Ng [4/48] Number of galaxies linked
by the FoF algorithm
8- 14 F7.3 deg RAdeg Group centre right ascension (J2000)
16- 22 F7.3 deg DEdeg Group centre declination (J2000)
24- 32 F9.3 km/s VCM [3033/20889] Mean group centre radial velocity
34- 40 F7.3 km/s sigma [29/625] Radial velocity dispersion
42- 46 F5.3 Mpc Rvir [0.07/3.1] 3D virial radius (in Mpc/h)
48- 53 F6.4 10+14Msun Mvir [0.01/5.2] Group virial mass
(in 1014M☉/h)
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Byte-by-byte Description of file: tableb2.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- ID [1/813] Group ID
5- 6 I2 --- Gal [1/48] Galaxy ID in group
8- 16 F9.5 deg RAdeg Right ascension (J2000)
18- 26 F9.5 deg DEdeg Declination (J2000)
28- 34 F7.5 --- z [0.009/0.071] Redshift in the 2M++ catalogue
36- 41 F6.3 mag Kmag K-corrected 2M++ apparent magnitude
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Acknowledgements:
Eugenia Diaz-Gimenez, eugeniadiazz(at)gmail.com
(End) Patricia Vannier [CDS] 06-Apr-2015