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Title:
Infrared Extinction toward Nearby Star-forming Regions
Authors:
Flaherty, K. M.; Pipher, J. L.; Megeath, S. T.; Winston, E. M.; Gutermuth, R. A.; Muzerolle, J.; Allen, L. E.; Fazio, G. G.
Affiliation:
AA(Steward Observatory, University of Arizona, Tucson, AZ 85721. This work was completed when the first author was at the University of Rochester.; Department of Astronomy, University of Rochester, Rochester, NY 14627.), AB(Department of Astronomy, University of Rochester, Rochester, NY 14627.), AC(Ritter Observatory, University of Toldeo, Toldeo, OH 43606.), AD(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AE(Department of Astronomy, University of Rochester, Rochester, NY 14627.; Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AF(Steward Observatory, University of Arizona, Tucson, AZ 85721. This work was completed when the first author was at the University of Rochester.), AG(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AH(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.)
Publication:
The Astrophysical Journal, Volume 663, Issue 2, pp. 1069-1082. (ApJ Homepage)
Publication Date:
07/2007
Origin:
UCP
ApJ Keywords:
ISM: Dust, Extinction, Infrared: General
DOI:
10.1086/518411
Bibliographic Code:
2007ApJ...663.1069F

Abstract

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 μm MIPS band. The source data for these measurements are observations of five nearby star-forming regions: the Orion A cloud, NGC 2068/2071, NGC 2024/2023, Serpens, and Ophiuchus. Color excess ratios EH-Ks/EKs-[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 μm for Serpens and NGC 2068/2071 using Spitzer MIPS data. We compare these results against several ISO extinction law determinations, although in each case there are assumptions which make absolute comparison uncertain. However, our work confirms a relatively flatter extinction curve from 4 to 8 μm than the previously assumed standard, as noted by all of these recent studies. The extinction law at 24 μm is consistent with previous measurements and models, although there are relatively large uncertainties.
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