Detection of CO J = 2 goes to 1 emission from the polar rings of NGC 2685 and NGC 4650A
| Autor: | Leah M. Buchholz, Dan M. Watson, Matthew T. Guptill |
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| Rok vydání: | 1994 |
| Předmět: |
Physics
Spiral galaxy Molecular cloud Astronomy Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Ring (chemistry) Galaxy Interstellar medium Space and Planetary Science Astrophysics::Solar and Stellar Astrophysics Polar Astrophysics::Galaxy Astrophysics Line (formation) Dwarf galaxy |
| Zdroj: | The Astrophysical Journal. 420:L21 |
| ISSN: | 1538-4357 0004-637X |
| DOI: | 10.1086/187153 |
| Popis: | We report the detection of the J = 2 goes to 1 (230 GHz) line of carbon monoxide in the polar rings of the galaxies NGC 2685 and NGC 4650A, and we use the results in a simple analysis of the composition of the neutral interstellar medium therein. Only 17%-35% of the gas mass of the NGC 4650A ring is provided by molecular clouds, perhaps consistent with the conventional picture of the origin of polar rings in the capture of a dwarf galaxy or tidal mass transfer from a spiral galaxy. The polar ring of NGC 2685, however, is quite rich in molecular matter, with an H2 mass greater than the neutral atomic hydrogen mass. Such a composition may be difficult to explain with the picture that applies to NGC 4650A. |
| Databáze: | OpenAIRE |
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