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For refcode 1997MNRAS.284..773G:
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NED Abstract

Copyright by Royal Astronomical Society. 1997MNRAS.284..773G Molecular gas in polar-ring galaxies G. Galletta, L. J. Sage and L. S. Sparke Accepted 1996 September 22. Received 1996 July 10 ABSTRACT We present CO J= 1-0 observations ({lambda} = 2.6 mm) of 10 polar-ring galaxies, chosen from the Polar Ring Catalogue; we infer masses of H_2_ ranging from 7 x 10^7^ to 2 x 10^10^ M_sun_, with an average of about 1 x 10 M_sun_. These H_2_ masses are greater than the average molecular mass of an early-type galaxy; we previously found similar results for a sample of minor-axis dust-lane ellipticals. In the cases where we can estimate the gas mass in the polar ring, including the H I masses from literature, they are high enough to allow self-gravitation to stabilize the rings. This means that the ages of the rings may be >= 1 Gyr. Indeed, the gas masses are often greater than those of most dwarf galaxies: this would make it unlikely that the polar rings result from the recent accretion of a single gas-rich dwarf. A survey of the fields around our sample galaxies shows in all but one case the presence of at least one companion with either a similar redshift or similar blue magnitude; these companions are close enough to have encountered the polar-ring galaxy in <1 Gyr. The companion galaxies may be the source of the detected gas, through tidal stripping. Key words: ISM: molecules - galaxies: elliptical and lenticular, cD - galaxies: formation - galaxies: interactions - galaxies: ISM - galaxies: kinematics and dynamics.
Retrieve 10 NED objects in this reference.
Please click here for ADS abstract

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