OGLE-ing the Magellanic System: Optical Reddening Maps of the Large and Small Magellanic Cloud from Red Clump Stars. (arXiv:2006.02448v1 [astro-ph.SR])
<a href="http://arxiv.org/find/astro-ph/1/au:+Skowron_D/0/1/0/all/0/1">D. M. Skowron</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Skowron_J/0/1/0/all/0/1">J. Skowron</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Udalski_A/0/1/0/all/0/1">A. Udalski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Szymanski_M/0/1/0/all/0/1">M. K. Szymański</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Soszynski_I/0/1/0/all/0/1">I. Soszyński</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wyrzykowski_%5C/0/1/0/all/0/1">Ł. Wyrzykowski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ulaczyk_K/0/1/0/all/0/1">K. Ulaczyk</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Poleski_R/0/1/0/all/0/1">R. Poleski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kozlowski_S/0/1/0/all/0/1">S. Kozłowski</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pietrukowicz_P/0/1/0/all/0/1">P. Pietrukowicz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Mroz_P/0/1/0/all/0/1">P. Mróz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rybicki_K/0/1/0/all/0/1">K. Rybicki</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Iwanek_P/0/1/0/all/0/1">P. Iwanek</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wrona_M/0/1/0/all/0/1">M. Wrona</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gromadzki_M/0/1/0/all/0/1">M. Gromadzki</a>
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 arcmin
in the central parts of the MCs, decreasing to approximately 27×27 arcmin in
the outskirts. The mean reddening is E(V-I) = 0.100 +- 0.043 mag in the LMC and
E(V-I) = 0.049 +- 0.024 mag in the SMC. We refine methods of calculating the RC
color to obtain the highest possible accuracy in determining the intrinsic
color of RC stars. We show that the intrinsic RC color in the LMC is $(V-I)_0 =
0.876 +- 0.013 mag and there is no color gradient in the verifiable range, i.e.
from 3 up to 9 deg from the galaxy center. In the case of the SMC (V-I)_0 =
0.856 +- 0.016 mag and is constant between 1 and 4 deg from the galaxy center,
followed by a slight decline beyond 4 deg from the center of the SMC. The
reddening map of the MCs is available on-line both in the downloadable form and
as an interactive interface.
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 arcmin
in the central parts of the MCs, decreasing to approximately 27×27 arcmin in
the outskirts. The mean reddening is E(V-I) = 0.100 +- 0.043 mag in the LMC and
E(V-I) = 0.049 +- 0.024 mag in the SMC. We refine methods of calculating the RC
color to obtain the highest possible accuracy in determining the intrinsic
color of RC stars. We show that the intrinsic RC color in the LMC is $(V-I)_0 =
0.876 +- 0.013 mag and there is no color gradient in the verifiable range, i.e.
from 3 up to 9 deg from the galaxy center. In the case of the SMC (V-I)_0 =
0.856 +- 0.016 mag and is constant between 1 and 4 deg from the galaxy center,
followed by a slight decline beyond 4 deg from the center of the SMC. The
reddening map of the MCs is available on-line both in the downloadable form and
as an interactive interface.
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