The intrinsic reddening of the Magellanic Clouds as traced by background galaxies - III. The Large Magellanic Cloud

Cameron P.M. Bell, Maria Rosa L. Cioni, Angus H. Wright, David L. Nidever, I. Da Chiang, Samyaday Choudhury, Martin A.T. Groenewegen, Clara M. Pennock, Yumi Choi, Richard De Grijs, Valentin D. Ivanov, Pol Massana, Ambra Nanni, Noelia E.D. Noël, Knut Olsen, Jacco Th Van Loon, A. Katherina Vivas, Dennis Zaritsky

Research output: Contribution to journalArticlepeer-review

1 Scopus citations


We present a map of the total intrinsic reddening across ≃ 90 deg2 of the Large Magellanic Cloud (LMC) derived using optical (ugriz) and near-infrared (IR; YJKs) spectral energy distributions (SEDs) of background galaxies. The reddening map is created from a sample of 222 752 early-type galaxies based on the lephareχ2 minimization SED-fitting routine. We find excellent agreement between the regions of enhanced intrinsic reddening across the central (4 × 4 deg2) region of the LMC and the morphology of the low-level pervasive dust emission as traced by far-IR emission. In addition, we are able to distinguish smaller, isolated enhancements that are coincident with known star-forming regions and the clustering of young stars observed in morphology maps. The level of reddening associated with the molecular ridge south of 30 Doradus is, however, smaller than in the literature reddening maps. The reduced number of galaxies detected in this region, due to high extinction and crowding, may bias our results towards lower reddening values. Our map is consistent with maps derived from red clump stars and from the analysis of the star formation history across the LMC. This study represents one of the first large-scale categorizations of extragalactic sources behind the LMC and as such we provide the lephare outputs for our full sample of ∼2.5 million sources.

Original languageEnglish (US)
Pages (from-to)824-840
Number of pages17
JournalMonthly Notices of the Royal Astronomical Society
Issue number1
StatePublished - Oct 1 2022


  • Magellanic Clouds
  • dust, extinction
  • galaxies: ISM
  • galaxies: photometry
  • surveys

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science


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