Aromatic emission from the ionised mane of the Horsehead nebula

Details Aromatic emission from the ionised mane of the Horsehead nebula Aromatic emission from the ionised mane of the Horsehead nebula

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..223c&link_type=abstract

SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.

Astronomy and Astrophysics

Astrophysics

Scientific paper

We study the evolution of the Aromatic Infrared Bands (AIBs) emitters across the illuminated edge of the Horsehead nebula and especially their properties in the HII region (IC434). A strong AIB at 11.3 μm is detected in the HII region, relative to the other AIBs at 6.2, 7.7 and 8.6 μm. The survival of AIB emitters (PAHs) in the HII region could be due to the moderate intensity of the radiation field (G_0 ˜ 100) and the lack of photons above ˜25 eV. The enhancement of the intensity of the 11.3 μm band in the HII region, relative to the other AIBs can be explained by the presence of neutral PAHs. 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.

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