2008A&A...479..927T


Query : 2008A&A...479..927T

2008A&A...479..927T - Astronomy and Astrophysics, volume 479, 927-937 (2008/3-1)

Groups of galaxies in the SDSS Data Release 5. A group-finder and a catalogue.

TAGO E., EINASTO J., SAAR E., TEMPEL E., EINASTO M., VENNIK J. and MUELLER V.

Abstract (from CDS):

We extract groups of galaxies from the SDSS Data Release 5 to study the supercluster-void network and environmental properties of groups therein. Groups of galaxies as density enhancements can be used to determine the luminosity density field of the supercluster-void network. We use a modified friends-of-friends (FoF) method with slightly variable linking lengths in transverse and radial directions to eliminate selection effects and to reliably find as many groups as possible. To determine the scaling of the linking length we calibrated group sizes and mean galaxy number densities within groups by shifting nearby groups to larger distances. Our final sample contains 17143 groups in the equatorial, and 33219 groups in the northern part of the DR5 survey. The group catalogue is available at the CDS. The mean sizes and velocity dispersions of our groups practically do not change with their distance. This means that the selection effects have been properly taken into account when generating the group catalogue.

Abstract Copyright:

Journal keyword(s): cosmology: observations - cosmology: large-scale structure of Universe - galaxies: clusters: general

VizieR on-line data: <Available at CDS (J/A+A/479/927): table3a.dat table3b.dat table3c.dat table3d.dat>

Nomenclature: Table 3a: dr5EGr NNNNN (Nos 1-17143). Table 3b: dr5NGr NNNNN (Nos 1-33219). Table 3c: dr5EGal NNNNN NNN N=129985. Table 3d: dr5NGal NNNNN NNN N=257078.

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024
#notes
1 NGC 3986 LIN 11 56 44.161 +32 01 18.14   14.0       ~ 57 1
2 NGC 3991 EmG 11 57 30.465 +32 20 03.00   13.8       ~ 156 1
3 NGC 3994 LIN 11 57 36.8662975416 +32 16 39.447161112   13.51 12.87     ~ 196 1
4 NGC 3995 rG 11 57 44.098 +32 17 38.64   12.81       ~ 166 0
5 NAME LOCAL SUPERCL SCG 12 31 +12.4           ~ 520 0
6 [EET2007] N152 SCG 13 06.2 -02 34           ~ 39 0
7 ACO 2197 ClG 16 27 48.01 +40 58 04.5           ~ 285 0
8 ACO 2199 ClG 16 28 43.31 +39 34 07.6           ~ 1172 1

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