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

Cameron P. M. Bell*, Maria-Rosa L. Cioni, A. H. Wright, Stefano Rubele, David L. Nidever, Ben L. Tatton, Jacco Th van Loon, 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 & 6 others Joana M. Oliveira, Knut Olsen, Clara M. Pennock, V. Ripepi, Smitha Subramanian, A. Katherina Vivas

*Corresponding author for this work

Research output: Contribution to journalArticle

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 χ2 minimization 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 [ΔE(B - V) ≃ 0.3mag]. 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 categorizations of extragalactic sources behind the SMC and as such we provide the LEPHARE outputs for our full sample of ~500 000 sources.

Original languageEnglish
Pages (from-to)993-1004
Number of pages12
JournalMonthly Notices of the Royal Astronomical Society
Volume499
Issue number1
DOIs
Publication statusPublished - 1 Nov 2020

Keywords

  • Dust, extinction
  • Galaxies: ISM-Magellanic Clouds
  • Galaxies: photometry
  • Surveys

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