Aromatic Features in M101 HII Regions and Starburst Galaxies

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dc.creatorGordon, Karl D.
dc.creatorEngelbracht, C. W.
dc.creatorSmith, J. -D. T.
dc.creatorRieke, G. H.
dc.creatorMisselt, K. A.
dc.date2006-05-22
dc.date.accessioned2026-07-07T07:08:32Z
dc.date.available2026-07-07T07:08:32Z
dc.descriptionThe behavior of the aromatic features as a function of metallicity/radiation field hardness in M101 HII regions and starburst galaxies is investigated using Spitzer/IRS spectra. These spectra reveal that the 6.2, 7.8+8.6, and 11.3 micron aromatics have different dependencies on metallicity/radiation field hardness. Specifically, the 6.2 and 7.8+8.6 micron aromatics are weak or absent at a metallicity, 12+log(O/H), of approx. 8.0 while the 11.3 micron feature remains relatively strong. These results apply to both the M101 HII regions and starbursts showing that HII regions can indeed be thought of as ``mini-starbursts.'' Comparison of this work with various candidate materials results in a good match with the annealing behavior in Quenched Carbonaceous Composite (QCC) which is an amorphous, hydrogenated, carbonaceous solid.
dc.description6 pages, To appear in the proceedings for the Spitzer Science Center 2005 Conference: Infrared Diagnostics of Galaxy Evolution, Ed. R. Chary. November, 2005, Pasadena
dc.identifierhttps://arxiv.org/abs/astro-ph/0605544
dc.identifierhttp://arxiv.org/abs/astro-ph/0605544
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/110742
dc.subjectAstrophysics
dc.titleAromatic Features in M101 HII Regions and Starburst Galaxies
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