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Date and Time of the Query: 2019-03-20 T14:55:58 PDT
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For refcode 2006ApJS..164..334F:
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Copyright by American Astronomical Society. Reproduced by permission
2006ApJS..164..334F The ACS Virgo Cluster Survey. VI. Isophotal Analysis and the Structure of Early-Type Galaxies Laura Ferrarese, Patrick Cote, Andres Jordan, Eric W. Peng, John P. Blakeslee, Slawomir Piatek, Simona Mei, David Merritt, Milos Milosavljevic, John L. Tonry, and Michael J. West Abstract. We present a detailed analysis of the morphology, isophotal parameters, and surface brightness profiles for 100 early-type members of the Virgo Cluster, from dwarfs (M_B_=-15.1 mag) to giants (M_B_=-21.8 mag), imaged in the g and z passbands using the Advanced Camera for Surveys on board the Hubble Space Telescope. Dust and complex morphological structures are common. Dust is detected in 42% of galaxies brighter than B_T_=12.15 mag, while kiloparsec-scale stellar disk, bars, and nuclear stellar disks are seen in 60% of galaxies with intermediate luminosity. Isophotal parameters are derived typically within 8 kpc from the center for the brightest galaxies, and 1.5 kpc for the faintest systems, with a resolution of 7 pc. For most galaxies, the surface brightness profiles are well described by a Sersic model with index n that increases steadily with the galaxy luminosity; only for 8 of the 10 brightest galaxies are the inner profiles (typically within 100 pc of the center) lower than expected based on an extrapolation of the outer Sersic model, and are better described by a single power-law function. Contrary to previous claims, we find no evidence in support of a strong bimodal behavior of the logarithmic slope of the inner surface brightness profile, {gamma}; in particular the {gamma} distribution for galaxies that do not show evidence of multiple morphological components is unimodal across the entire magnitude range spanned by the ACSVCS galaxies. Although the brightest galaxies have shallow inner profiles, the shallowest profiles are found in faint dwarf systems. The widely adopted separation of early-type galaxies between "core" and "power-law" types is questioned based on the present study. Key words: ISM: Dust, Extinction, Galaxies: Clusters: Individual: Name: Virgo, Galaxies: ISM, Galaxies: Elliptical and Lenticular, cD, Galaxies: Nuclei
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