Using Gaseous Disks to Probe the Geometric Structure of Elliptical Galaxies. Tohline, J., E., Simonson, G., F., & Caldwell, N. The Astrophysical Journal, 252:92, 1982.
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Paper Website abstract bibtex
Paper Website abstract bibtex Cold gas residing in the core of an elliptical galaxy should settle into a preferred plane of the galaxy regardless of the orientation that the gas's orbital angular momentum vector may have had when the gas entered the galaxy. The preferred plane into which the gas settles depends only on the gross geometric shape of the elliptical galaxy. If the galaxy is intrinsically prolate (cigar-shaped), the gas will align its angular momentum vector with the longest axis of the galaxy; if the galaxy is oblate, the gas will align its anular momentum vector with the shortest axis of the galaxy. A numberical model is used to show that the time scale on which this settling occurs is reasonably short if the gas disk is less than 10 kpc in size. Knowing the preferrred orientation of a gaseous disk in an elliptical galaxy, we are able to decipher the geometric structure of 12 galaxies that posses gas in their cores. Both prolate and oblate elliptical galaxies are found to exist. We have also derived the intrinsic axial ratio of most of these galaxies. The shapes of these galaxies have been determined without making any assumptions about why the group of stars defining each galaxy is shaped as it is. Our results provide new insight into problems regarding the formation and current structure of elliptical galaxies.
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abstract = {Cold gas residing in the core of an elliptical galaxy should settle into a preferred plane of the galaxy regardless of the orientation that the gas's orbital angular momentum vector may have had when the gas entered the galaxy. The preferred plane into which the gas settles depends only on the gross geometric shape of the elliptical galaxy. If the galaxy is intrinsically prolate (cigar-shaped), the gas will align its angular momentum vector with the longest axis of the galaxy; if the galaxy is oblate, the gas will align its anular momentum vector with the shortest axis of the galaxy. A numberical model is used to show that the time scale on which this settling occurs is reasonably short if the gas disk is less than 10 kpc in size. Knowing the preferrred orientation of a gaseous disk in an elliptical galaxy, we are able to decipher the geometric structure of 12 galaxies that posses gas in their cores. Both prolate and oblate elliptical galaxies are found to exist. We have also derived the intrinsic axial ratio of most of these galaxies. The shapes of these galaxies have been determined without making any assumptions about why the group of stars defining each galaxy is shaped as it is. Our results provide new insight into problems regarding the formation and current structure of elliptical galaxies.},
bibtype = {article},
author = {Tohline, Joel E. and Simonson, Gregory F. and Caldwell, Nelson},
journal = {The Astrophysical Journal}
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