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Date and Time of the Query: 2019-03-19 T12:55:50 PDT
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For refcode 2011ApJ...728...45L:
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Copyright by American Astronomical Society. Reproduced by permission
2011ApJ...728...45L Influence of the Environment on Polycyclic Aromatic Hydrocarbon Emission in Star-forming Regions Lebouteiller, V.; Bernard-Salas, J.; Whelan, D. G.; Brandl, B.; Galliano, F.; Charmandaris, V.; Madden, S.; Kunth, D. Abstract. We investigate the emission properties of polycyclic aromatic hydrocarbons (PAHs) in various metallicity environments with the Infrared Spectrograph on board Spitzer. Local giant H II regions are used as references as they enable access to the distinct interstellar medium components that contribute to the mid-infrared spectrum of star-forming galaxies: photodissociation regions (PDRs), photoionized gas, stellar clusters, and embedded regions. Three objects are considered: NGC 3603 in the Milky Way, 30 Doradus in the Large Magellanic Cloud, and N 66 in the Small Magellanic Cloud. From the variations of the PAH/14 micron ratio, we find that PAHs are destroyed in the ionized gas for a radiation field such that [Ne III]/[Ne II] >~3. From the variations of the PAH/Hu{alpha} ratio, we find that the PAH emission sources in the giant H II regions follow the same photodestruction law regardless of metallicity. We then compare these results with observations of starburst galaxies, H II galaxies, and blue compact dwarf galaxies (BCDs). While the integrated mid-infrared spectra of BCDs are reminiscent of a warm dusty ionized gas, we observe a significant contribution to the PAH emission in starburst galaxies that is not arising from PDRs. Key words: dust, extinction, galaxies: star clusters: general, H II regions, infrared: galaxies, infrared: ISM, ISM: molecules
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