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Title: Measuring distances and reddenings for a billion stars: Toward a 3D dust map from Pan-STARRS 1

We present a method to infer reddenings and distances to stars based only on their broad-band photometry, and show how this method can be used to produce a three-dimensional (3D) dust map of the Galaxy. Our method samples from the full probability density function of distance, reddening, and stellar type for individual stars, as well as the full uncertainty in reddening as a function of distance in the 3D dust map. We incorporate prior knowledge of the distribution of stars in the Galaxy and the detection limits of the survey. For stars in the Pan-STARRS 1 (PS1) 3π survey, we demonstrate that our reddening estimates are unbiased and accurate to ∼0.13 mag in E(B – V) for the typical star. Based on comparisons with mock catalogs, we expect distances for main-sequence stars to be constrained to within ∼20%-60%, although this range can vary, depending on the reddening of the star, the precise stellar type, and its position on the sky. A later paper will present a 3D map of dust over the three quarters of the sky surveyed by PS1. Both the individual stellar inferences and the 3D dust map will enable a wealth of Galactic science in the plane.more » The method we present is not limited to the passbands of the PS1 survey but may be extended to incorporate photometry from other surveys, such as the Two Micron All Sky Survey, the Sloan Digital Sky Survey (where available), and in the future, LSST and Gaia.« less
Authors:
;  [1] ; ;  [2] ;  [3] ; ; ; ; ; ; ; ;  [4] ; ;  [5] ;  [6]
  1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138 (United States)
  2. Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg (Germany)
  3. LSST Corporation, 933 North Cherry Avenue, Tucson, AZ 85721 (United States)
  4. Institute for Astronomy, University of Hawaii at Manoa, Honolulu, HI 96822 (United States)
  5. Department of Physics, Durham University, South Road, Durham DH1 3LE (United Kingdom)
  6. Observatoire Astronomique de Strasbourg, 11 rue de l'Université, F-67000 Strasbourg (France)
Publication Date:
OSTI Identifier:
22351574
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 783; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CATALOGS; COMPARATIVE EVALUATIONS; DISTANCE; DISTRIBUTION; DUSTS; GALAXIES; MAIN SEQUENCE STARS; MAPS; PHOTOMETRY; PROBABILITY DENSITY FUNCTIONS; SENSITIVITY; THREE-DIMENSIONAL CALCULATIONS