Ferreras, I;
Tress, M;
Bruzual, G;
Charlot, S;
Page, M;
Yershov, V;
Kuin, P;
... Cropper, M; + view all
(2021)
Constraints on the dust extinction law of the Galaxy with Swift/UVOT, Gaia, and 2MASS.
Monthly Notices of the Royal Astronomical Society
, 505
(1)
pp. 283-292.
10.1093/mnras/stab1270.
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Abstract
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 10 452 stars out to ∼4 kpc with photometry covering a wide spectral window. The near ultraviolet passbands optimally encompass the 2175 Å bump, so that we can simultaneously fit the net extinction, quoted in the V band (A_{V}), the steepness of the wavelength dependence (δ), 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 AV and Galactic latitude, as well as a weaker bump strength at higher extinction. δ 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.
| Type: | Article |
|---|---|
| Title: | Constraints on the dust extinction law of the Galaxy with Swift/UVOT, Gaia, and 2MASS |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stab1270 |
| Publisher version: | https://doi.org/10.1093/mnras/stab1270 |
| Language: | English |
| Additional information: | Copyright © 2021 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited. |
| Keywords: | dust, extinction, ISM: general, Galaxy: general |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10128201 |
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