dEs and the dI Fundamental Plane

Details dEs and the dI Fundamental Plane dEs and the dI Fundamental Plane

2005-04-18

arxiv.org/abs/astro-ph/0504385v1

Astronomy and Astrophysics

Astrophysics

To appear in the Proceedings of the IAU Colloquium 198, H. Jerjen & B. Binggeli

Scientific paper

10.1017/S1743921305003893

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.

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