Astron. J., 130, 1502-1515 (2005/October-0)
The NGC 5846 group: dynamics and the luminosity function to mR=-12.
MAHDAVI A., TRENTHAM N. and TULLY R.B.
Abstract (from CDS):
We conduct a photometric and spectroscopic survey of a 10 deg2 region surrounding the nearby NGC 5846 group of galaxies, using the Canada-France-Hawaii and Keck I telescopes to study the population of dwarf galaxies as faint as MR=-10. Candidates are identified on the basis of quantitative surface brightness and qualitative morphological criteria. Spectroscopic follow up and a spatial correlation analysis provide the basis for affirming group memberships. Altogether, 324 candidates are identified, and 83 have spectroscopic membership confirmation. We argue on statistical grounds that a total of 251±10 galaxies in our sample are group members. The observations, together with archival Sloan Digital Sky Survey, ROSAT, XMM-Newton, and ASCA data, suggest that the giant ellipticals NGC 5846 and NGC 5813 are the dominant components of subgroups separated by 600 kpc in projection and embedded in a 1.6 Mpc diameter dynamically evolved halo. The galaxy population is overwhelmingly early type. The group velocity dispersion is 322 km/s, its virial mass is 8.4x1013 M☉, and M/LR=320 M☉L–1☉. The ratio of dwarfs to giants is large compared with other environments in the Local Supercluster studied, and, correspondingly, the luminosity function is relatively steep, with a faint-end Schechter function slope of αd=-1.3±0.1 (statistical) ±0.1 (systematic) at our completeness limit of MR=-12.
galaxies: clusters: individual (NGC 5846) - Galaxies: Dwarf - Galaxies: Halos - Galaxies: Kinematics and Dynamics - Galaxies: Luminosity Function, Mass Function - X-Rays: Galaxies
VizieR on-line data:
<Available at CDS (J/AJ/130/1502): table1.dat>
Table 1: [MTT2005] N5846-NNN (Nos 1 to 324).
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