Astronomy and Astrophysics – Astronomy
Scientific paper
May 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985mnras.214..177s&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 214, May 15, 1985, p. 177-187.
Astronomy and Astrophysics
Astronomy
139
Astronomical Catalogs, Cosmic Dust, Elliptical Galaxies, Galactic Evolution, Mass Distribution, Astronomical Photometry, Axes Of Rotation, Disk Galaxies, Magnitude
Scientific paper
Despite much recent interest in the properties of elliptical galaxies with dust lanes, no attempt has yet been made to determine the incidence of such galaxies among the elliptical population as a whole. Using a complete sample of early-type galaxies, and accounting as far as possible for selection effects, the true fraction of galaxies with dust is estimated to be about 40 percent for nearby ellipticals and somewhat higher than this for S0s. On the basis of their observed axial ratios and absolute magnitudes, diskless galaxies with dust constitute a class of true elliptical galaxies quite distinct from S0(2/3) dust-lane galaxies. Dust absorption in elliptical galaxies may mimic isophotal twisting in some cases (e.g., IC3370). This can be distinguished from true twisting by two-color surface photometry. Shells are found around about 25 percent of elliptical galaxies in the sample studied, but there is no strong correlation between the presence of shells and dust. This is intriguing since both features are often taken as signs of past interactions with the environment.
Gerhard Ortwin E.
Sadler Elaine M.
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