Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009eimw.confe..21c&link_type=abstract
"The Evolving ISM in the Milky Way and Nearby Galaxies, The Fourth Spitzer Science Center Conference, Proceedings of the confere
Other
Galaxies: Ism, Infrared: Galaxies, Infrared: Ism, Ism: Dust, Extinction, Ism: Hii Region, Ism: Lines And Bands
Scientific paper
We present a study of Aromatic Infrared Band (AIBs) emission in the IC434 HII region ahead the Horsehead nebula as well as in the associated photodissociation region (PDR). AIBs are detected in the HII region and the correlation of the 11.3 μm AIB with ionised gas lines shows that PAHs must be located in the ionised gas. The survival of AIBs emitters in the HII region could be due to the moderate intensity of the radiation field (G_0 ˜ 100) and the lack of photons with energy above ˜ 25 eV. The relatively high strength of the 11.3 μm AIB regarding the other AIBs at 6.2, 7.7 and 8.6 μm in the HII region spectrum is explained by the presence of neutral PAHs in the ionised gas while they are mostly ionised in the PDR. Our observations highlight a transition region between ionised and neutral PAHs observed with ideal conditions in our Galaxy. A scenario where PAHs can survive in HII regions and be preferantially neutral could explain the detection of a prominent 11.3 μm band in other Spitzer observations.
Abergel Alain
Boulanger Francois
Compiegne Mathieu
Habart Emilie
Joblin Ch.
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