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    Mapping the Interstellar Reddening and Extinction toward Baade's Window Using Minimum Light Colors of ab-type RR Lyrae Stars: Revelations from the De-reddened Color-Magnitude Diagrams

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    Saha_2019_ApJ_874_30.pdf
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    PDF
    Description:
    Final Published version
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    Author
    Saha, Abhijit cc
    Vivas, A. Katherina cc
    Olszewski, Edward W.
    Smith, Verne
    Olsen, Knut cc
    Blum, Robert cc
    Valdes, Francisco cc
    Claver, Jenna
    Calamida, Annalisa
    Walker, Alistair R.
    Matheson, Thomas cc
    Narayan, Gautham cc
    Soraisam, Monika
    Cunha, Katia
    Axelrod, T.
    Bloom, Joshua S.
    Cenko, S. Bradley
    Frye, Brenda
    Juric, Mario
    Kaleida, Catherine
    Kunder, Andrea cc
    Miller, Adam
    Nidever, David
    Ridgway, Stephen
    Saha, Abhijit cc
    Vivas, A. Katherina cc
    Olszewski, Edward W.
    Smith, Verne
    Olsen, Knut cc
    Blum, Robert cc
    Valdes, Francisco cc
    Claver, Jenna
    Calamida, Annalisa
    Walker, Alistair R.
    Matheson, Thomas cc
    Narayan, Gautham cc
    Soraisam, Monika
    Cunha, Katia
    Axelrod, T.
    Bloom, Joshua S.
    Cenko, S. Bradley
    Frye, Brenda
    Juric, Mario
    Kaleida, Catherine
    Kunder, Andrea cc
    Miller, Adam
    Nidever, David
    Ridgway, Stephen
    Show allShow less
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2019-03-20
    Keywords
    Galaxy: bulge
    Galaxy: stellar content
    Galaxy: structure
    ISM: dust, extinction
    methods: data analysis
    stars: variables: RR Lyrae
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Abhijit Saha et al 2019 ApJ 874 30
    Journal
    ASTROPHYSICAL JOURNAL
    Rights
    © 2019. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We have obtained repeated images of six fields toward the Galactic bulge in five passbands (u, g, r, i, z) with the DECam imager on the Blanco 4 m telescope at CTIO. From more than 1.6 billion individual photometric measurements in the field centered on Baade's window, we have detected 4877 putative variable stars. A total of 474 of these have been confirmed as fundamental mode RR Lyrae stars, whose colors at minimum light yield line-of-sight reddening determinations, as well as a reddenning law toward the Galactic Bulge, which differs significantly from the standard R-V = 3.1 formulation. Assuming that the stellar mix is invariant over the 3 square-degree field, we are able to derive a line-of-sight reddening map with sub-arcminute resolution, enabling us to obtain de-reddened and extinction corrected color-magnitude diagrams (CMDs) of this bulge field using up to 2.5 million well-measured stars. The corrected CMDs show unprecedented detail and expose sparsely populated sequences: for example, delineation of the very wide red giant branch, structure within the red giant clump, the full extent of the horizontal branch, and a surprising bright feature that is likely due to stars with ages younger than 1 Gyr. We use the RR. Lyrae stars to trace the spatial structure of the ancient stars and find an exponential decline in density with Galactocentric distance. We discuss ways in which our data products can be used to explore the age and metallicity properties of the bulge, and how our larger list of all variables is useful for learning to interpret future LSST alerts.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/ab07ba
    10.3847/1538-4357/ab07ba/data
    Version
    Final published version
    Sponsors
    U.S. Department of Energy; U.S. National Science Foundation; Ministry of Science and Education of Spain; Science and Technology Facilities Council of the United Kingdom; Higher Education Funding Council for England; National Center for Supercomputing Applications at the University of Illinois at Urbana-Champaign; Center for Cosmology and Astro-Particle Physics at the Ohio State University; Mitchell Institute for Fundamental Physics and Astronomy at Texas A M University; Financiadora de Estudos e Projetos, Fundacao Carlos Chagas Filho de Amparo a Pesquisa do Estado do Rio de Janeiro, Conselho Nacional de Desenvolvimento Cientifico e Tecnologico; Ministerio da Ciencia, Tecnologia e Inovacao; Deutsche Forschungsgemeinschaft; Collaborating Institutions in the Dark Energy Survey; Argonne National Laboratory; University of California at Santa Cruz; University of Cambridge; Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas-Madrid; University of Chicago, University College London; DES-Brazil Consortium; University of Edinburgh; Eidgenossische Technische Hochschule (ETH) Zurich, Fermi National Accelerator Laboratory; University of Illinois at Urbana-Champaign; Institut de Ciencies de l'Espai (IEEC/CSIC); Institut de Fisica d'Altes Energies, Lawrence Berkeley National Laboratory; Ludwig-Maximilians Universitat Munchen; Excellence Cluster Universe; University of Michigan; National Optical Astronomy Observatory; University of Nottingham; Ohio State University; OzDES Membership Consortium the University of Pennsylvania; University of Portsmouth, SLAC National Accelerator Laboratory, Stanford University; University of Sussex; Texas AM University; NSF [AST-1313001, AST-1815767]
    Additional Links
    http://stacks.iop.org/0004-637X/874/i=1/a=30?key=crossref.bc0927e12fd6380fbe37f2e32f40b5dd
    https://iopscience.iop.org/article/10.3847/1538-4357/ab07ba/data
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/ab07ba
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