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Date and Time of the Query: 2019-04-25 T05:39:21 PDT
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For refcode 1995A&A...297..643W:
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Copyright by European Southern Observatory (ESO). Reproduced by permission
1995A&A...297..643W The molecular cloud content of early-type galaxies VI. CO in elliptical galaxies T. Wiklind, F. Combes, and C. Henkel Onsala Space Observatory, 5-43992 Onsala, Sweden DEMIRM Observatoire de Paris, 61 Av. de l'Observatoire, F-75014 Paris, France Max-Planck-Institut fur Radioastronomie, Auf dem Hugel 69, D-53 121 Bonn, Germany Received 5 May 1994/Accepted 16 October 1994 Abstract. A survey of CO emission in 29 far-IR selected elliptical galaxies resulted in 16 detections, of which 3 remain tentative. The molecular gas masses range from 2 x 10^6^ M_sun_ to 1 x 10^9^ M_sun_, and appear to be unrelated to the underlying stellar population. This suggests an external origin of the gas. Most of the elliptical galaxies with a molecular gas component have a gas-to-dust mass ratio of ~700, where dust masses are derived from the IRAS fluxes, but some appear to have a ratio as low as 50. A small apparent gas-to-dust mass ratio is also found for some late-type galaxies, and is correlated with a low dust temperature. We suggest that a large part of the far-infrared emission from these galaxies (both early- and late-types) comes from dust associated with the atomic gas component rather than star forming regions associated with the molecular gas, and that they contain a cold dust component. Low excitation temperatures for CO transitions in galaxies with cold dust could lead to an underestimate of the molecular gas mass by a factor of 5. The average M_H_2_,/M_HI_ ratio for the elliptical galaxies is 2-5 times lower than for normal spiral galaxies. Field ellipticals appear more likely to contain an observable molecular gas component than those ellipticals residing in groups and clusters. Key words: galaxies: elliptical and lenticular, cD - galaxies: ISM - radio lines: galaxies - infrared galaxies
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