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Date and Time of the Query: 2019-08-18 T02:26:17 PDT
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For refcode 2005AJ....130.1502M:
Retrieve 330 NED objects in this reference.
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2005AJ....130.1502M The NGC 5846 Group: Dynamics and the Luminosity Function to M_R_=-12 Andisheh Mahdavi, Neil Trentham, and R. Brent Tully Abstract. We conduct a photometric and spectroscopic survey of a 10 deg^2^ 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 M_R_=-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^-1^, its virial mass is 8.4x10^13^M_sun_, and M/L_R_=320M_sun_L^-1^_sun_. 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 {alpha}_d_=-1.3+/-0.1 (statistical) +/-0.1 (systematic) at our completeness limit of M_R_=-12. Keywords: galaxies: clusters: individual (NGC 5846), Galaxies: Dwarf, Galaxies: Halos, Galaxies: Kinematics and Dynamics, Galaxies: Luminosity Function, Mass Function, X-Rays: Galaxies
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