The distribution of atomic gas and dust in nearby galaxies - III. Radial distributions and metallicity gradients
| Autor: | H. C. Thomas, Stephen Anthony Eales, M. S. Clemens, P. Alexander, David A. Green, Loretta Dunne |
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| Rok vydání: | 2004 |
| Předmět: |
Physics
Hydrogen Radio galaxy Metallicity Resolution (electron density) Astronomy chemistry.chemical_element Astronomy and Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Astrophysics Radial distribution Galaxy Exponential function Distribution (mathematics) chemistry Space and Planetary Science Astrophysics::Earth and Planetary Astrophysics Astrophysics::Galaxy Astrophysics |
| Zdroj: | ResearcherID |
| ISSN: | 1365-2966 0035-8711 |
| DOI: | 10.1111/j.1365-2966.2004.07795.x |
| Popis: | The radial distribution of dust and gas in 38 nearby galaxies is investigated, using a sample of galaxies for which matched resolution (25 arcsec) neutral hydrogen (H i) and 850-μm images are available. Most of these radial profiles are fitted well by an exponential model, and the derived 850-μm scalelengths are proportional to the H i scalelengths. From this relation, it is found that the metallicity gradients of these galaxies are much shallower than previous studies, unless the dust temperature is constant within the disc, or a significant component of molecular gas exists at large radii that is not traced by CO observations. |
| Databáze: | OpenAIRE |
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