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The intrinsic reddening of the Magellanic Clouds as traced by background galaxies – II. The Small Magellanic Cloud

Bell, Cameron P M; Cioni, Maria-Rosa L; Wright, A H; Rubele, Stefano; Nidever, David L; Tatton, Ben L; Van Loon, Jacco Th; Zaritsky, Dennis; Choi, Yumi; Choudhury, Samyaday; Clementini, Gisella; de Grijs, Richard; Ivanov, Valentin D; Majewski, Steven R; Marconi, Marcella; Martínez-Delgado, David; Massana, Pol; Muñoz, Ricardo R; Niederhofer, Florian; Noël, Noelia E D; Oliveira, Joana M; Olsen, Knut; Pennock, Clara M; Ripepi, V; Subramanian, Smitha; Vivas, A Katherina

The intrinsic reddening of the Magellanic Clouds as traced by background galaxies – II. The Small Magellanic Cloud Thumbnail


Authors

Cameron P M Bell

Maria-Rosa L Cioni

A H Wright

Stefano Rubele

David L Nidever

Ben L Tatton

Dennis Zaritsky

Yumi Choi

Samyaday Choudhury

Gisella Clementini

Richard de Grijs

Valentin D Ivanov

Steven R Majewski

Marcella Marconi

David Martínez-Delgado

Pol Massana

Ricardo R Muñoz

Florian Niederhofer

Noelia E D Noël

Knut Olsen

Clara M Pennock

V Ripepi

Smitha Subramanian

A Katherina Vivas



Abstract

We present a map of the total intrinsic reddening across ? 34 deg2 of the Small Magellanic Cloud (SMC) derived using optical (ugriz) and near-infrared (IR; YJKs) spectral energy distributions (SEDs) of background galaxies. The reddening map is created using a subsample of 29,274 galaxies with low levels of intrinsic reddening based on the lephare ?2 minimisation SED-fitting routine. We find statistically significant enhanced levels of reddening associated with the main body of the SMC compared with regions in the outskirts [?E(B - V) ? 0.3 mag]. A comparison with literature reddening maps of the SMC shows that, after correcting for differences in the volume of the SMC sampled, there is good agreement between our results and maps created using young stars. In contrast, we find significant discrepancies between our results and maps created using old stars or based on longer wavelength far-IR dust emission that could stem from biased samples in the former and uncertainties in the far-IR emissivity and the optical properties of the dust grains in the latter. This study represents one of the first large-scale categorisations of extragalactic sources behind the SMC and as such we provide the lephare outputs for our full sample of ~ 500,000 sources.

Journal Article Type Article
Acceptance Date Sep 8, 2020
Online Publication Date Sep 21, 2020
Publication Date 2020-11
Publicly Available Date May 26, 2023
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Oxford University Press
Peer Reviewed Peer Reviewed
Volume 499
Issue 1
Pages 993 -1004
DOI https://doi.org/10.1093/mnras/staa2786
Keywords surveys – dust, extinction – galaxies: ISM – Magellanic Clouds – galaxies: photometry.
Publisher URL https://doi.org/10.1093/mnras/staa2786

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