Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009eimw.confe..24f&link_type=abstract
"The Evolving ISM in the Milky Way and Nearby Galaxies, The Fourth Spitzer Science Center Conference, Proceedings of the confere
Other
Dust, Extinction, Infrared:General
Scientific paper
We present an independent estimate of the interstellar extinction law for the Spitzer IRAC bands as well as a first attempt at extending the law to the 24 micron MIPS band. The source data for these measurements are observations of five nearby star-forming regions: the Orion A cloud, NGC 2068/71, NGC 2024/23, Serpens and Ophiuchus. Color excess ratios EH-K_s/EK_s-[λ] were measured for stars without infrared excess dust emission from circumstellar disks/envelopes. For four of these five regions, the extinction laws are similar at all wavelengths and differ systematically from a previous determination of the extinction law, which was dominated by the diffuse ISM, derived for the IRAC bands. This difference could be due to the difference in the dust properties of the dense molecular clouds observed here and those of the diffuse ISM. The extinction law at longer wavelengths toward the Ophiuchus region lies between that to the other four regions studied here and that for the ISM. In addition, we extended our extinction law determination to 24 micron for Serpens and NGC 2068/71 using Spitzer MIPS data. Our work confirms a relatively flatter extinction curve from 4, 8μm than the previously assumed standard. The extinction law at 24 micron is consistent with previous measurements and models, although there are relatively large uncertainties.
Allen Laura E.
Fazio Giacomo
Flaherty Kevin M.
Gutermuth Robert A.
Megeath Thomas S.
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