Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aj....104.2097w&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 104, no. 6, p. 2097-2103.
Astronomy and Astrophysics
Astronomy
24
Cosmic Dust, Elliptical Galaxies, Molecular Gases, Carbon Monoxide, Galactic Evolution, Infrared Astronomy Satellite, Interstellar Matter, Luminosity, Milky Way Galaxy
Scientific paper
We have searched for CO(1-0) line emission in eight dust lane elliptical and lenticular galaxies using the Nobeyama 45 m telescope. Five of the eight galaxies, including the well-studied elliptical NGC 1052, have CO emission at above the 5-sigma level, with inferred molecular gas masses ranging from 10 exp 8 to a few times 10 exp 9 solar masses. Our selection criterion differs from previous surveys in that it does not depend on the FIR fluxes, and thus is less sensitive to the sizes and distances of the host galaxies or to the degree to which dust is heated. The relatively high detection rate of CO in these ellipticals suggests a close correlation between molecular mass and cold dust. Compared with previously studied samples of FIR selected early-type galaxies, our sample has on average four times more CO emission per unit FIR (40-120 microns) luminosity. If the intrinsic gas-to-dust ratio of these galaxies as similar to that of the Milky Way, then only about 5 percent of the dust mass in dust lane ellipticals radiates substantially at 60 and 100 microns, and the remaining dust must be colder than about 30 K.
Ishizuki Sumio
Kenney Jeffrey D. P.
Wang Zhong
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