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Galaxy scaling relations from the ACS Virgo and Fornax Cluster Surveys: no evidence for a dwarf-giant dichotomy

Published online by Cambridge University Press:  01 July 2007

Patrick Côté ,
Laura Ferrarese ,
Andrés Jordán ,
John P. Blakeslee ,
Chin-Wei Chen ,
Leopoldo Infante ,
Simona Mei ,
Eric W. Peng ,
John L. Tonry  and
Michael J. West
Patrick Côté
Affiliation:
Herzberg Institute of Astrophysics, Victoria, BC, Canada
Laura Ferrarese
Affiliation:
Herzberg Institute of Astrophysics, Victoria, BC, Canada
Andrés Jordán
Affiliation:
European Southern Observatory, Garching, Germany
John P. Blakeslee
Affiliation:
Washington State University, Pullman, WA, U.S.A.
Chin-Wei Chen
Affiliation:
Herzberg Institute of Astrophysics, Victoria, BC, Canada National Central University, Jhongli, Taiwan
Leopoldo Infante
Affiliation:
Pontificia Universidad Católica de Chile, Santiago, Chile
Simona Mei
Affiliation:
Observatoire de Paris, Paris, France
Eric W. Peng
Affiliation:
Herzberg Institute of Astrophysics, Victoria, BC, Canada
John L. Tonry
Affiliation:
Institute for Astronomy, Honolulu, HI, U.S.A.
Michael J. West
Affiliation:
European Southern Observatory, Garching, Germany
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Abstract

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We examine the photometric and structural properties of early-type galaxies derived from the ACS Virgo and Fornax Cluster Surveys, supplementing these data with previously published or newly reanalysed data for additional early-type galaxies in Virgo, Fornax and the Local Group. As we have noted elsewhere, Sérsic models are found to provide accurate representations of the observed brightness profiles on scales greater than a few percent of the effective radius, Re. On smaller scales, the brightness profiles of bright (MB ≳ −20) galaxies show central deficits with respect to the inward extrapolation of the Sérsic models; fainter galaxies usually show central excesses. Fainter than MB ≈ −20, we find a continuity in the photometric and structural scaling relations: i.e., between absolute magnitude, central surface brightness, Sérsic index, effective radius, and the surface brightness measured at, and averaged within, the effective radius. There is no evidence for a “dwarf/giant dichotomy” — a conclusion consistent with a number of recent studies but contrary to some earlier claims.

Keywords

galaxies: elliptical and lenticularcD – galaxies: fundamental parameters – galaxies: nuclei – galaxies: photometry – galaxies: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S245: Formation and Evolution of Galaxy Bulges , July 2007 , pp. 395 - 398
Copyright
Copyright © International Astronomical Union 2008

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