1997/11/15 by D. L. Tucker, Yasuhiro Hashimoto, Y. Hashimoto +19
Engineering · Physics and Astronomy · #Astronomical Observations and Instrumentation #Astronomy and Astrophysical Research #Astrophysics (astro-ph) #FOS: Physical sciences #Scientific Research and Discoveries #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/9711176
11 pages, LaTeX. A poster paper which appeared at the the 12th Potsdam Cosmology Workshop, "Large Scale Structure: Tracks and Traces". A 2-page writeup of the poster will appear in the conference proceedings and is presently available at http://manaslu.astro.utoronto.ca:80/~lin/ConfProc/ConfProc.html and at http://www.aip.de:8080/~tucker/ConfProc/ConfProc.html
arxiv created 1997/11/15 · openalex publication_date 1997/11/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
A "friends-of-friends" percolation algorithm has been used to extract a catalogue of drho/rho = 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 statistical 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 less, or contain a 55 arcsec "orphan" (a galaxy with a "faked" redshift excluded from the original LCRS redshift catalogue due to its proximity --- i.e., within 55 arcsec --- of another galaxy). Median properties derived from the statistical sample include: line-of-sight velocity dispersion sigmalos = 164 km/s, crossing time tcr = 0.10/H0, harmonic radius Rh = 0.58/h Mpc, pairwise separation Rp = 0.64/h Mpc, virial mass Mvir = (1.90x1013)/h Msun, total group R-band luminosity Ltot = (1.40x1011)/h2 Lsun, and R-band mass-to-light ratio M/L = 153h Msun/Lsun.