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2000ApJS..130..267M - Astrophys. J., Suppl. Ser., 130, 267-338 (2000/October-0)
Nuclear gas and dust disks in nearby 3CR elliptical galaxies.
MARTEL A.R., TURNER N.J., SPARKS W.B. and BAUM S.A.
Abstract (from CDS):
The major axes of the disks and their hosts are preferentially aligned, with the degree of alignment uncorrelated with disk size. As projected on the sky, all the disks are more flattened than their host galaxies. Three of the hosts have boxy isophotes, and the remainder are normal in shape. The two boxiest galaxies, NGC 4261 and NGC 5532, show significant displacements between their nuclear and isophotal centers.
The mass of the disk in NGC 4261 is estimated using radiative transfer calculations. Scattering into the line of sight is included in the approximation that the dust is isotropically illuminated by surrounding stars. The observed colors and surface brightness are shown to be matched by a thin layer of dust that lies in front of three-quarters (eastern edge) to one-quarter (western edge) of the starlight. When a Galactic opacity curve is used, the mass determined is an order of magnitude larger than that found assuming the dust lies in a foreground screen. The opacity falls more steeply toward the infrared than do those of Galactic and Magellanic Cloud grains, suggesting that the dust is not unprocessed material from a merger with a spiral or irregular galaxy.
Abstract Copyright: ∼
Journal keyword(s): Galaxies: Elliptical and Lenticular, cD - Galaxies: ISM - Galaxies: Nuclei - Galaxies: Structure
Simbad objects: 20
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