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Title:
Aromatic Features in M101 HII Regions and Starburst Galaxies
Authors:
Gordon, K. D.; Engelbracht, C.; Smith, J. D. T.; Rieke, G.; Misselt, K.
Publication:
The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution. ASP Conference Series, Vol. 381, proceedings of the conference held 14-16 November, 2005 in Pasadena, California, USA. Edited by Ranga-Ram Chary, Harry I. Teplitz and Kartik Sheth. San Francisco: Astronomical Society of the Pacific, 2008., p.122
Publication Date:
03/2008
Origin:
ASP
Bibliographic Code:
2008ASPC..381..122G

Abstract

The 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 µ aromatics have different dependencies on metallicity/radiation field hardness. Specifically, the 6.2 and 7.8+8.6 µ aromatics are weak or absent at a metallicity, 12+log(O/H), of ˜8.0 while the 11.3 µ 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.
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