Groups of Galaxies in the Las Campanas Survey Slice at $\delta$=-6$\deg$
Session 71 -- Galaxy and CBR Distribution
Display presentation, Friday, January 14, 9:30-6:45, Salons I/II Room (Crystal Gateway)

## [71.08] Groups of Galaxies in the Las Campanas Survey Slice at $\delta$=-6$\deg$

D. L. Tucker, A. A. Oemler, Jr. (Yale), S. A. Shectman (OCIW), R. P. Kirshner, H. Lin (CFA), P. L. Schechter (MIT)

The Las Campanas Deep Redshift Survey (LCDRS) is an attempt to survey a sufficiently large volume of the universe in order to determine the scale of the largest structures, and thereby obtain a fair sample of the three-dimensional galaxy distribution in the nearby universe. Presented are results from a group catalogue derived by means of a "friends-of-friends" percolation algorithm for the LCDRS slice at $\delta$ = -6$\deg$. Groups in this catalogue are defined to be $\delta\rho/\rho$ = 80 number density enhancements above the global mean; roughly 23\% of LCDRS -6$\deg$ Slice galaxies are group members. The median line-of-sight velocity dispersion for the LCDRS groups is $\sigma_{los}$ = 177 km s$^{- 1}$; the median mass-to-light ratio is $M/L$ = 182h $M_{\sun}/L_{\sun}$ in the R-band ($\sim$ 200h $M_{\sun}/L_{\sun}$ in the de Vaucouleurs B(0)-band). LCDRS group properties are compared with those of other group catalogues.