Polycyclic aromatic hydrocarbons in the dwarf galaxy IC 10 |
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| Authors: | D S Wiebe O V Egorov T A Lozinskaya |
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| Institution: | (1) Department of Astronomy, University of Washington, Seattle, Washington 98105-1580, USA; |
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| Abstract: | Archival infrared Spitzer Space Telescope observations are used to study the dust component of the ISM in the irregular galaxy
IC 10. The dust distribution in the galaxy is compared to the distributions of the Hα and S II] emission, neutral gas and CO clouds, and ionizing radiation sources. The distribution of polycyclic aromatic hydrocarbons
(PAHs) in the galaxy is shown to be highly non-uniform, with the fraction of these particles in total dust mass reaching 4%.
On the whole, PAHs avoid bright H II regions and correlate with the atomic and molecular gas. This pattern suggests that they
form in the dense interstellar gas. It is suggested that the observed metallicity dependence of the PAH abundance shows up
not only globally (at the level of the entire galaxy), but also locally (at least, at the level of individual H II regions).
No conclusive evidence for shock destruction of PAHs in the IC 10 galaxy has been found. |
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