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OGLE-ing the Magellanic System: Optical Reddening Maps of the Large and Small Magellanic Clouds from Red Clump Stars

Skowron, D. M. and Skowron, J. and Udalski, A. and Szymanski, M. K. and Soszyński, I. and Wyrzykowski, Ł. and Ulaczyk, K. and Poleski, R. and Kozłowski, S. and Pietrukowicz, P. and Mróz, P. and Rybicki, K. and Iwanek, P. and Wrona, M. and Gromadzki, M. (2021) OGLE-ing the Magellanic System: Optical Reddening Maps of the Large and Small Magellanic Clouds from Red Clump Stars. Astrophysical Journal Supplement Series, 252 (2). Art. No. 23. ISSN 1538-4365.

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We present the most extensive and detailed reddening maps of the Magellanic Clouds (MCs) derived from the color properties of Red Clump (RC) stars. The analysis is based on the deep photometric maps from the fourth phase of the Optical Gravitational Lensing Experiment (OGLE-IV), covering approximately 670 deg² of the sky in the Magellanic System region. The resulting maps provide reddening information for 180 deg² in the Large Magellanic Cloud (LMC) and 75 deg² in the Small Magellanic Cloud (SMC), with a resolution of 1.’7 × 1.’7 in the central parts of the MCs, decreasing to approximately 27' × 27' in the outskirts. The mean reddening is E(V − I) = 0.100 ± 0.043 mag in the LMC and E(V − I) = 0.047 ± 0.025 mag in the SMC. We refine methods of calculating the RC color to obtain the highest possible accuracy of reddening maps based on RC stars. Using spectroscopy of red giants, we find the metallicity gradient in both MCs, which causes a slight decrease of the intrinsic RC color with distance from the galaxy center of ~0.002 mag/deg in the LMC and between 0.003 and 0.009 mag/deg in the SMC. The central values of the intrinsic RC color are 0.886 and 0.877 mag in the LMC and SMC, respectively. The reddening map of the MCs is available both in downloadable form and as an interactive interface.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper ItemData
Skowron, D. M.0000-0001-9439-604X
Skowron, J.0000-0002-2335-1730
Udalski, A.0000-0001-5207-5619
Szymanski, M. K.0000-0002-0548-8995
Soszyński, I.0000-0002-7777-0842
Wyrzykowski, Ł.0000-0002-9658-6151
Ulaczyk, K.0000-0001-6364-408X
Poleski, R.0000-0002-9245-6368
Kozłowski, S.0000-0003-4084-880X
Pietrukowicz, P.0000-0002-2339-5899
Mróz, P.0000-0001-7016-1692
Rybicki, K.0000-0002-9326-9329
Iwanek, P.0000-0002-6212-7221
Wrona, M.0000-0002-3051-274X
Gromadzki, M.0000-0002-1650-1518
Additional Information:© 2021 The American Astronomical Society. Received 2020 June 4; revised 2020 October 31; accepted 2020 November 9; published 2021 February 1. We thank Marek Górski and David Nataf for fruitful discussions on reddening in the MCs. We also thank the referee for their valuable suggestions that led to many improvements of this paper. The OGLE project has received funding from the NCN grant MAESTRO 2014/14/A/ST9/00121 to A.U. D.M.S. has received support from the NCN grant 2013/11/D/ST9/03445. This research has made use of the NASA/IPAC Infrared Science Archive, which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. Funding for the Sloan Digital Sky Survey IV has been provided by the Alfred P. Sloan Foundation, the U.S. Department of Energy Office of Science, and the Participating Institutions. SDSS acknowledges support and resources from the Center for High-Performance Computing at the University of Utah. The SDSS website is SDSS is managed by the Astrophysical Research Consortium for the Participating Institutions of the SDSS Collaboration including the Brazilian Participation Group, the Carnegie Institution for Science, Carnegie Mellon University, Center for Astrophysics mid Harvard & Smithsonian (CfA), the Chilean Participation Group, the French Participation Group, Instituto de Astrofísica de Canarias, The Johns Hopkins University, Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo, the Korean Participation Group, Lawrence Berkeley National Laboratory, Leibniz Institut für Astrophysik Potsdam (AIP), Max-Planck-Institut für Astronomie (MPIA Heidelberg), Max-Planck-Institut für Astrophysik (MPA Garching), Max-Planck-Institut für Extraterrestrische Physik (MPE), National Astronomical Observatories of China, New Mexico State University, New York University, University of Notre Dame, Observatório Nacional/MCTI, The Ohio State University, Pennsylvania State University, Shanghai Astronomical Observatory, United Kingdom Participation Group, Universidad Nacional Autónoma de México, University of Arizona, University of Colorado Boulder, University of Oxford, University of Portsmouth, University of Utah, University of Virginia, University of Washington, University of Wisconsin, Vanderbilt University, and Yale University. This work has made use of NASA's Astrophysics Data System Bibliographic Services.
Funding AgencyGrant Number
National Science Centre (Poland)MAESTRO 2014/14/A/ST9/00121
National Science Centre (Poland)2013/11/D/ST9/03445
Alfred P. Sloan FoundationUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Participating InstitutionsUNSPECIFIED
Subject Keywords:Interstellar dust extinction ; Magellanic Clouds; Red giant clump
Issue or Number:2
Classification Code:Unified Astronomy Thesaurus concepts: Interstellar dust extinction (837); Magellanic Clouds (990); Red giant clump (1370)
Record Number:CaltechAUTHORS:20210202-145513316
Persistent URL:
Official Citation:D. M. Skowron et al 2021 ApJS 252 23
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:107882
Deposited By: Tony Diaz
Deposited On:03 Feb 2021 00:24
Last Modified:03 Feb 2021 00:24

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