NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-03-26 T07:30:13 PDT
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For refcode 2007ApJ...664..226L:
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Copyright by American Astronomical Society. Reproduced by permission
2007ApJ...664..226L The Centers of Early-Type Galaxies with Hubble Space Telescope. VI. Bimodal Central Surface Brightness Profiles Tod R. Lauer, Karl Gebhardt, S. M. Faber, Douglas Richstone, Scott Tremaine, John Kormendy, M. C. Aller, Ralf Bender, Alan Dressler, Alexei V. Filippenko, Richard Green, and Luis C. Ho Abstract. We combine several HST investigations on the central structure of early-type galaxies to generate a large sample of surface photometry. The studies selected were those that used the "Nuker law" to characterize the inner light distributions of the galaxies. The sample comprises WFPC1 and WFPC2 V-band observations published earlier by our group, R-band WFPC2 photometry of Rest et al., NICMOS H-band photometry by Ravindranath et al. and Quillen et al., and the brightest cluster galaxy WFPC2 I-band photometry of Laine et al. The distribution of the logarithmic slopes of the central brightness profiles strongly affirms that the central structure of elliptical galaxies with M_V_<-19 is bimodal, based on both parametric and nonparametric analysis. At the HST resolution limit, most galaxies are either power-law systems, which have steep cusps in surface brightness, or core systems, which have shallow cusps interior to a steeper envelope brightness distribution. A rapid transition between the two forms occurs over the luminosity range -22<M_V_<-20, with cores dominating at the highest luminosities and power laws at the lowest. There are a few "intermediate" systems that have both cusp slopes and total luminosities that fall within the core/power-law transition, but they are rare and do not fill in the overall bimodal distribution. Key words: Galaxies: Nuclei, Galaxies: Photometry, Galaxies: Structure
Retrieve 219 NED objects in this reference.
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