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26 April 2024 |
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Article overview
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Groups of Galaxies in the Las Campanas Redshift Survey | D. L. Tucker
; Y. Hashimoto
; R. P. Kirshner
; S. D. Landy
; H. Lin
; A. Oemler
; P. L. Schechter
; S. A. Shectman
; | Date: |
16 Nov 1997 | Subject: | astro-ph | Affiliation: | Fermilab), Y. Hashimoto (Yale), R. P. Kirshner (CfA), S. D. Landy (Berkeley), H. Lin (Toronto), A. Oemler (OCIW), P. L. Schechter (MIT), S. A. Shectman (OCIW | Abstract: | 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 sigma_los = 164 km/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 = (1.40x10^11)/h^2 L_sun, and R-band mass-to-light ratio M/L = 153h M_sun/L_sun. | Source: | arXiv, astro-ph/9711176 | Services: | Forum | Review | PDF | Favorites |
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