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dEs and the dI fundamental plane

Published online by Cambridge University Press:  08 November 2005

Ovidiu Vaduvescu  and
Marshall L. McCall
Ovidiu Vaduvescu
Affiliation:
Department of Physics and Astronomy, York University 128 Petrie Science Building, 4700 Keele St., Toronto, Ontario M3J 1P3, Canada email: [email protected], [email protected]
Marshall L. McCall
Affiliation:
Department of Physics and Astronomy, York University 128 Petrie Science Building, 4700 Keele St., Toronto, Ontario M3J 1P3, Canada email: [email protected], [email protected]
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Abstract

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Despite much work, the connection between dwarf elliptical galaxies (dEs) and dwarf irregulars (dIs) remains unclear. Recently, we found that the surface brightness profiles (SBPs) of dIs in the near-infrared can be well fitted with a hyperbolic secant (sech) function. From sech fits, a tight relationship was derived between the absolute magnitude, central surface brightness, and 21cm line widths, which amounts to a fundamental plane for dIs. Here we examine how closely dEs fit into the dI fundamental plane using published data for 22 dEs in the Virgo cluster and the Local Group. Over a 9 mag interval in absolute magnitude the dEs fall in the plane defined by the dIs. The outstanding overlap suggests more than a casual relationship between the two classes.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 1 , Colloquium C198: Near-Field Cosmology with Dwarf Elliptical Galaxies , March 2005 , pp. 265 - 266
Copyright
© 2005 International Astronomical Union