Hostname: page-component-78c5997874-94fs2 Total loading time: 0 Render date: 2024-11-15T04:16:43.195Z Has data issue: false hasContentIssue false
  • English
  • Français

The Mid-IR Extinction Law in the LMC

Published online by Cambridge University Press:  21 March 2013

Jian Gao ,
Mengyao Xue  and
B. W. Jiang
Jian Gao
Affiliation:
Department of Astronomy, Beijing Normal University, Beijing 100875, China email: jiangao@bnu.edu.cn
Mengyao Xue
Affiliation:
Department of Astronomy, Beijing Normal University, Beijing 100875, China email: jiangao@bnu.edu.cn
B. W. Jiang
Affiliation:
Department of Astronomy, Beijing Normal University, Beijing 100875, China email: jiangao@bnu.edu.cn
Rights & Permissions [Opens in a new window]

Abstract

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

The mid-infrared (MIR) extinction law in the Large Magellanic Cloud (LMC) at four IRAC bands is derived using the data of the Spitzer/SAGE Program. The derived mean extinctions are A[3.6]/AKs = 0.68±0.03, A[4.5]/AKs = 0.97±0.03, A[5.8]/AKs = 0.54±0.04, and A[8.0]/AKs = 0.58±0.07. The results show that: (1) The extinctions at [3.6], [5.8] and [8.0] of the LMC consist a flat curve, similar to that of the Milky Way (MW) predicted by the interstellar grain model at Rv = 5.5; (2) The extinction at [4.5] is clearly higher than the other three bands, which may be caused by the additional absorption of the 4.27μm CO2 ice and/or the 4.67μm CO ice in the LMC molecular clouds; (3) As far as individual sightlines are concerned, the MIR interstellar extinction law Aλ/AKs in the LMC varies with sightlines as the MW does.

Keywords

dustextinction — infrared: ISM — Magellanic Clouds
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S292: Molecular Gas, Dust, and Star Formation in Galaxies , August 2012 , pp. 286
Copyright
Copyright © International Astronomical Union 2013

References

Dobashi, K., Bernard, J.-P., Hughes, A., et al. 2008, A&A, 484, 205Google Scholar
Gao, J., Jiang, B. W., & Li, A. 2009, ApJ, 707, 89CrossRefGoogle Scholar
Imara, N. & Blitz, L. 2007, ApJ, 662, 969Google Scholar
Koornneef, J. 1982, A&A, 107, 247Google Scholar
Nikolaev, S. & Weinberg, M. D. 2000, ApJ, 542, 804CrossRefGoogle Scholar