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29 March 2024
 
  » arxiv » astro-ph/0006153

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Loose Groups of Galaxies in the Las Campanas Redshift Survey
D. L. Tucker ; A. Oemler ; Y. Hashimoto ; S. A. Shectman ; R. P. Kirshner ; H. Lin ; S. D. Landy ; P. L. Schechter ; S. S. Allam ;
Date 12 Jun 2000
Journal Astrophys.J.Suppl. 130 (2000) 237
Subject astro-ph
AffiliationFNAL), A. Oemler (OCIW), Y. Hashimoto (OCIW/AIP), S. A. Shectman (OCIW), R. P. Kirshner (CfA), H. Lin (Steward), S. D. Landy (William and Mary), P. L. Schechter (MIT), S. S. Allam (NRIAG/Helwan
AbstractA ``friends-of-friends’’ percolation algorithm has been used to extract a catalogue of dn/n = 80 density enhancements (groups) from the six slices of the Las Campanas Redshift Survey (LCRS). The full catalogue contains 1495 groups and includes 35% of the LCRS galaxy sample. A clean sample of 394 groups has been derived by culling groups from the full sample which either are too close to a slice edge, have a crossing time greater than a Hubble time, have a corrected velocity dispersion of zero, or contain a 55-arcsec ``orphan’’ (a galaxy with a mock redshift which was excluded from the original LCRS redshift catalogue due to its proximity to another galaxy -- i.e., within 55 arcsec). Median properties derived from the clean sample include: line-of-sight velocity dispersion sigma_los = 164km/s, crossing time t_cr = 0.10/H_0, harmonic radius R_h = 0.58/h Mpc, pairwise separation R_p = 0.64/h Mpc, virial mass M_vir = (1.90x10^13)/h M_sun, total group R-band luminosity L_tot = (1.30x10^11)/h^2 L_sun, and R-band mass-to-light ratio M/L = 171h M_sun/L_sun; the median number of observed members in a group is 3.
Source arXiv, astro-ph/0006153
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