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Date and Time of the Query: 2019-03-26 T05:36:14 PDT
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For refcode 1993PASJ...45..529S:
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Copyright by Astronomical Society of Japan. 1993PASJ...45..529S CO in Elliptical Galaxies and the Universal CO-to-Dust Ratio Yoshiaki SOFUE Institute of Astronomy, The University of Tokyo, Mitaka, Tokyo 181 and Ken-ichi WAKAMATSU Department of Physics, Gifu University, Gifu 501-11 (Received 1992 October 19; accepted 1993 February 9) Abstract By carrying out a deep survey of ^12^CO(J = 1-0) line emission toward elliptical galaxies, we co-added two CO detected ellipticals, NGC 4589 and NGC 4697. These two ellipticals are FIR galaxies, and NGC 4589 has a dust lane across the major axis. Adding data from the literature, we found that the CO-to-dust abundance ratio in elliptical galaxies is approximately the same as that for spirals and for local molecular clouds. We conclude that the CO-to-dust ratio, which is an indicator of the mutual abundance ratios among heavy elements, is universal in interstellar matter in ellipticals, spirals, and in local molecular clouds. This is explained if the ratio is kept constant (frozen), since interstellar heavy elements and dust, which are supplied from late-type stars and their circumstellar shells, have left their parent stars. Key words: Chemical abundance - CO line - Dust; interstellar - Galaxies; elliptical - Interstellar matter
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