Aromatic Features in M101 HII Regions and Starburst Galaxies

Details Aromatic Features in M101 HII Regions and Starburst Galaxies Aromatic Features in M101 HII Regions and Starburst Galaxies

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aspc..381..122g&link_type=abstract

The Second Annual Spitzer Science Center Conference: Infrared Diagnostics of Galaxy Evolution. ASP Conference Series, Vol. 381,

Astronomy and Astrophysics

Astronomy

1

Scientific paper

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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