NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-23 T03:04:14 PDT
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For refcode 1989A&A...217...35B:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1989A&A...217...35B Isophote shapes of elliptic galaxies II. Correlations with global optical, radio and X-ray properties R. Bender, P. Surma, S. Dobereiner, C. Mollenhoff, and R. Madejsky Landessternwarte Konigstuhl, D-6900 Heidelberg, Federal Republic of Germany Received September 21, accepted October 28, 1988 Summary. We discuss the relations between isophote shapes and other global properties of massive elliptical galaxies. Only weak correlations between the classical optical parameters - luminosity, de Vaucouleurs radius, ellipticity - and isophote shapes are found. In contrast, there exist striking relations between the isophote shapes and the radio- and X-ray properties of elliptical galaxies. Objects which are radio-loud and/or surrounded by gaseous X-ray halos generally have boxy or irregular isophotes. Elliptical galaxies with pointed isophotes (usually interpreted to contain weak edge-on disks) are mostly radio-quiet and show no X-ray emission in excess of the discrete source contribution. Elliptical galaxies with box-shaped or irregular isophotes seem to have systematically higher mass-to-light ratios than ellipticals with weak disk components. Key words: elliptical galaxies - active galaxies - coronae of galaxies - structure of galaxies
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