Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.135c&link_type=abstract
The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole
Astronomy and Astrophysics
Astronomy
Scientific paper
We report the first detections of diffuse interstellar bands (DIBs) in absorption towards early-type supergiant stars in the Local Group spiral galaxies M 31 and M 33. The 4430, 5705, 5780, 5797, 6203, 6269, 6283, 6379 and 6613 DIBs are detected at radial velocities matching the blue-shifted M 31 and M 33 Na I absorption lines. The overall spectrum of DIBs and the ratios of strengths between the different M 31 and M 33 DIBs are found to be similar to those typically observed in the Milky Way. Some of the M 31 and M 33 DIB equivalent widths are found to be exceptionally large per unit reddening (E(B-V)) compared with those typically observed in the Galaxy. The conditions in M 31 and M 33 are apparently quite favourable for the production of the large organic molecules that are believed to be the carriers of at least some of the DIBs. These results are interpreted in the context of the interstellar physical and chemical conditions of these galaxies compared with the Milky Way, including the interstellar radiation field and the PAH abundances. A negative correlation is found in M 31 between the DIB strengths and the strength of the interstellar NUV radiation field, which suggests that the DIB carriers and/or their chemical precursors are destroyed by NUV radiation.
Cordiner Martin
Cox Nagin
Evans Chris
Gordon Karl
Sarre Peter
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