Compact Elliptical Galaxies and Ultracompact Dwarfs in the Sloan Digital Sky Survey

Details Compact Elliptical Galaxies and Ultracompact Dwarfs in the Sloan Digital Sky Survey Compact Elliptical Galaxies and Ultracompact Dwarfs in the Sloan Digital Sky Survey

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20917804m&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #178.04; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We present results of a search for compact elliptical galaxies and ultracompact dwarfs in the field. Compact elliptical galaxies like M32, NGC 4486B and NGC 5846A are thought to be generated by tidal stripping of more massive galaxies, but for reasons that are not well understood, they are extremely rare. At distances beyond the Virgo cluster, faint compact ellipticals are difficult to resolve under typical ground-based seeing conditions and are often missed by wide-field spectroscopic surveys. Fortunately, their ugriz colors identify them as composite stellar populations and thus distinguish them from the vast majority of foreground stars. We have obtained spectra of a sample of compact elliptical candidates identified in this way using photometry from the Sloan Digital Sky Survey. Several of these sources are compact, red galaxies with luminosities between those of the prototypical compact ellipticals and the much fainter ultracompact dwarfs. We will discuss the structure, stellar populations, and kinematics of these galaxies.

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