The Central Structure of Early Type Galaxies

Details The Central Structure of Early Type Galaxies The Central Structure of Early Type Galaxies

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...18911106l&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #111.06; Bulletin of the American Astronomical Society, Vol. 28, p.1423

Astronomy and Astrophysics

Astronomy

Scientific paper

We parametrize HST surface-brightness profiles of 61 elliptical galaxies and bulges by break radii r_b and break brightnesses I_b. Luminous galaxies (M_V<-20.5) have cuspy cores with steep outer power-law profiles that break at r=r_b to shallow inner profiles I~ r(-gamma ) , with gamma <=0.3. Break radii for these objects are approximately proportional to effective radius and luminosity. Cores follow a fundamental plane that parallels the global fundamental plane. Faint galaxies (M_V>-22.0) show steep, largely featureless power-law profiles that lack cores. The centers of power-law galaxies are up to 1000 times denser in mass than the cores of large galaxies at 10 pc. At intermediate magnitudes (-22.0

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