Constraints on the dust extinction law of the Galaxy with Swift/UVOT, Gaia, and 2MASS

被引：6

作者：

Ferreras, Ignacio ^{[1
,2
,3
,4
]}

Tress, Monica ^{[2
]}

Bruzual, Gustavo ^{[5
]}

Charlot, Stephane ^{[6
]}

Page, Mat ^{[2
]}

Yershov, Vladimir ^{[2
]}

Kuin, Paul ^{[2
]}

Kawata, Daisuke ^{[2
]}

Cropper, Mark ^{[2
]}

机构：

[1] Inst Astrofis Canarias, Calle Via Lactea S-N, E-38205 San Cristobal la Laguna, Tenerife, Spain

[2] Univ Coll London, Mullard Space Sci Lab, Holmbury St Mary, Dorking RH5 6NT, Surrey, England

[3] UCL, Dept Phys & Astron, London WC1E 6BT, England

[4] Univ La Laguna, Dept Astrofis, E-38206 San Cristobal la Laguna, Tenerife, Spain

[5] UNAM, Inst Radioastron & Astrofis, Campus Morelia, Morelia 58089, Michoacan, Mexico

[6] Sorbonne Univ, Inst Astrophys Paris, UMR7095, CNRS, F-75014 Paris, France

来源：

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 2021年 / 505卷 / 01期

基金：

英国科学技术设施理事会;

关键词：

dust; extinction; ISM: general; Galaxy: general; LARGE-MAGELLANIC-CLOUD; INTERSTELLAR DUST; MILKY-WAY; STELLAR SPECTRA; ULTRAVIOLET; ATTENUATION; CURVES; SHAPES; SOLAR; M82;

D O I：

10.1093/mnras/stab1270

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We explore variations of the dust extinction law of the Milky Way by selecting stars from the Swift/UVOT Serendipitous Source Catalogue, cross-matched with Gaia DR2 and 2MASS to produce a sample of 10452 stars out to similar to 4 kpc with photometry covering a wide spectral window. The near ultraviolet passbands optimally encompass the 2175 angstrom bump, so that we can simultaneously fit the net extinction, quoted in the V band (A(V)), the steepness of the wavelength dependence (delta), and the bump strength (E-b). The methodology compares the observed magnitudes with theoretical stellar atmospheres from the models of Coelho. Significant correlations are found between these parameters, related to variations in dust composition that are complementary to similar scaling relations found in the more complex dust attenuation law of galaxies - that also depend on the distribution of dust among the stellar populations within the galaxy. We recover the strong anticorrelation between A(V) and Galactic latitude, as well as a weaker bump strength at higher extinction. delta is also found to correlate with latitude, with steeper laws towards the Galactic plane. Our results suggest that variations in the attenuation law of galaxies cannot be fully explained by dust geometry.

引用

页码：283 / 292

页数：10

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