Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.196..747h&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 196, Sept. 1981, p. 747-756.
Astronomy and Astrophysics
Astronomy
126
Cosmic Dust, Galactic Evolution, Galactic Structure, Galaxies, Astronomical Models, Elliptical Galaxies, Luminous Intensity, Sky Surveys (Astronomy), Stellar Mass Accretion
Scientific paper
A comprehensive, homogeneous sample of 40 optically selected dust-lane galaxies, which exhibit no obvious associated luminous disks, is presented along with a preliminary discussion of its properties. A dearth of such galaxies in the north is attributed to the poorer resolution of the Palomar Sky Survey relative to the Southern Sky Survey, which is the source materiaal in the south. It is inferred that there may not be a comparably large population of galaxies with dust lanes closely confined to their central regions. The orientation of the dust lanes is varied, but the majority occurs impartially on the major or minor axes of the light distribution, with a substantial minority of skew cases with the dust at an intermediate angle. Observed properties of the galaxies are summarized, and it is suggested that the properties are best attributed to the accretion of cool material at a fairly recent epoch (less than a few x 10 to the 9th yr ago), and that subsequent evolution of this material can explain the observed distribution of dust lane orientation. It is thought that a significant number of early-type galaxies are prolate in form.
Corwin Harold G. Jr.
Elson Rebecca A. W.
Hawarden Tim G.
Longmore Andrew J.
Tritton Susan Barbara
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