Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...236..237i&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 236, no. 1, Sept. 1990, p. 237-241.
Astronomy and Astrophysics
Astrophysics
103
Abundance, Galactic Nuclei, Interstellar Extinction, Interstellar Matter, Metallicity, Molecular Gases, Carbon Monoxide, Far Infrared Radiation, Hydrogen, Line Spectra, Milky Way Galaxy
Scientific paper
The dependence of the dust-to-gas ratio on Galacto-centric radius and its relation to the known metallicity gradient in the Galaxy and nearby galaxies is investigated. Despite the large degree of uncertainty associated with both quantities, there is evidence for a correlation, with dust-to-gas ratio and metallicity decreasing at roughly the same rate with increasing radius. Such a result has important implications. For example, attempts using FIR surveys to estimate the conversion between observed CO emission and molecular hydrogen column density should allow for the varying dust-to-gas ratio. Broadbent et al. (1989) used a dust-to-gas ratio that varied in proportion to metallicity, following the approach used by Cox et al. (1986), and confirmed the previously estimated low value for the conversion factor; there is thus support for this result.
Issa M. R.
MacLaren Ian
Wolfendale Arnold W.
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