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Small Variation of the NIR and MIR Interstellar Extinction Laws

Published online by Cambridge University Press:  02 August 2018

Jian Gao ,
B. W. Jiang  and
Mengyao Xue
Jian Gao
Affiliation:
Department of Astronomy, Beijing Normal University, Beijing 100875, China
B. W. Jiang
Affiliation:
Department of Astronomy, Beijing Normal University, Beijing 100875, China
Mengyao Xue
Affiliation:
Department of Astronomy, Beijing Normal University, Beijing 100875, China International Centre for Radio Astronomy Research, Curtin University, Bentley, Australia email: jiangao@bnu.edu.cn
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Abstract

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Using the data from APOGEE, WISE, and GLIMPSE, we explored the variation of the near-infrared (NIR) and mid-infrared (MIR) interstellar extinction laws of the Milky Way. We derived the IR extinction laws towards a number of different sightlines, including 24 bins along Galactic latitude (b) and 592 plates observed by APOGEE. Our results indicate that E(J-H)/E(J-K) show only subtle variation along b, Galactic longitude (l), or the depth of E(J-K). This suggests that the NIR extinction law can be considered as universal. Similarly, E(K-W1, W2, W3, [3.6], [4.5], [5.8], [8.0])/E(J-K) also show only small variation along b, l, or the extinction depth. The MIR extinction curve is flat, indicating that the MIR extinction law is likely universal.

Keywords

dustextinctiongalaxies: ISMGalaxy: diskinfrared: ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S334: Rediscovering our Galaxy , July 2017 , pp. 292 - 293
Copyright
Copyright © International Astronomical Union 2018 

References

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