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Cited by 222Stellar, planetary, and galactic studiesGalaxies: Formation, Evolution, PhenomenaAstronomy and Astrophysical Research

LIGHT CURVE TEMPLATES AND GALACTIC DISTRIBUTION OF RR LYRAE STARS FROM SLOAN DIGITAL SKY SURVEY STRIPE 82

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Sesar, Branimir, Ivezić, Željko, Grammer, Skyler H., Morgan, Dylan P., Becker, Andrew C., Jurić, Mario, De Lee, Nathan, Annis, James +9 more·2010·The Astrophysical Journal
DOI 10.1088/0004-637x/708/1/717
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Abstract

We present an improved analysis of halo substructure traced by RR Lyrae stars in the Sloan Digital Sky Survey (SDSS) stripe 82 region. With the addition of SDSS-II data, a revised selection method based on new ugriz light curve templates results in a sample of 483 RR Lyrae stars that is essentially free of contamination. The main result from our first study persists: the spatial distribution of halo stars at galactocentric distances 5–100 kpc is highly inhomogeneous. At least 20% of halo stars within 30 kpc from the Galactic center can be statistically associated with substructure. We present strong direct evidence, based on both RR Lyrae stars and main-sequence stars, that the halo stellar number density profile significantly steepens beyond a Galactocentric distance of ∼30 kpc, and a larger fraction of the stars are associated with substructure. By using a novel method that simultaneously combines data for RR Lyrae and main-sequence stars, and using photometric metallicity estimates for main-sequence stars derived from deep co-added u -band data, we measure the metallicity of the Sagittarius dSph tidal stream (trailing arm) toward R.A. ∼2 h –3 h and decl. ∼ 0° to be 0.3 dex higher ([Fe/H] = −1.2) than that of surrounding halo field stars. Together with a similar result for another major halo substructure, the Monoceros stream, these results support theoretical predictions that an early forming, smooth inner halo, is metal-poor compared to high surface brightness material that have been accreted onto a later-forming outer halo. The mean metallicity of stars in the outer halo that are not associated with detectable clumps may still be more metal-poor than the bulk of inner-halo stars, as has been argued from other data sets.

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  • Mapping the Galaxy requires large-area coverage, excellent image quality to maximize photometric and astrometric accuracy, photometric precision of at least 1%, and systematic astrometric errors not exceeding about 10 mas per observation.

    “Mapping the Galaxy requires large-area coverage; excellent image quality to maximize photometric and astrometric accuracy, especially in crowded fi elds; photometric precision of at least 1% to separate main-sequence and giant stars ( e.g., Helmi et al. 2003 ) , as well as to identify variable stars such as RR Lyrae ( Sesar et al. 2010; Sharma et al. 2011 ) ; and systematic astrometric errors not”

    From LSST: From Science Drivers to Reference Design and Anticipated Data Products (2019) · cites this paper as Sesar et al. 2010

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Research works printed but not linked: 6

  1. Bond, N. A., et al. 2009, ApJ, submitted (arXiv:0909.0013) · arXiv
  2. Carollo, D., et al. 2009, ApJ, submitted (arXiv:0909.3019) · arXiv
  3. De Lee, N. 2008, PhD thesis, Michigan State Univ.
  4. Kolenberg, K. 2008, J. Phys.: Conf. Ser., 118, 2060
  5. Reimann, J. D. 1994, PhD thesis, Univ. California, Berkeley
  6. Salvadori, S., et al. 2009, MNRAS, submitted (arXiv:0908.4279) · arXiv

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Authors
Sesar, B., Ivezić, Ž., Grammer, S. H., Morgan, D. P., Becker, A. C., Jurić, M., De Lee, N., Annis, J., Beers, T. C., Fan, X., Lupton, R. H., Gunn, J. E., Knapp, G. R., Jiang, L., Jester, S., Johnston, D. E., & Lampeitl, H.
Affiliations
  • University of Washington (US)
  • Institute for Advanced Study (US)
  • Fermi National Accelerator Laboratory (US)
  • Joint Institute for Nuclear Astrophysics (US)
  • University of Arizona (US)
  • Princeton University (US)
  • Max Planck Institute for Astronomy (DE)
ORCID
Venue
The Astrophysical Journal
Publisher
American Astronomical Society
Published
2009-12-15
Volume
708
Issue
1
Pages
717-741
ISSN
  • 0004-637X (ISSN-L)
  • 1538-4357
DOI
10.1088/0004-637x/708/1/717
OpenAlex
W2011614275
Cited by
222
References
89
Citations by year
2026: 5 · 2025: 9 · 2024: 10 · 2023: 5 · 2022: 13 · 2021: 13 · 2020: 8 · 2019: 16 · 2018: 22 · 2017: 17 · 2016: 19 · 2015: 12 · 2014: 17 · 2013: 19 · 2012: 19
FWCI
6.22
Type
journal article
Language
en
Open access
Locations
  • The Astrophysical Journal (publishedVersion)
  • arXiv (Cornell University) (submittedVersion)
  • Max Planck Institute for Plasma Physics (submittedVersion)
  • arXiv (Cornell University)
Funders
  • National Science Foundation (0551161, 0822648, 0707901, 0503584, 0807444)
  • U.S. Department of Energy (51161, 51164)
  • National Aeronautics and Space Administration
  • Alfred P. Sloan Foundation
  • Ohio State University
  • Aspen Center for Physics
  • Johns Hopkins University
  • University of Pittsburgh
  • Case Western Reserve University
  • Drexel University
  • Universität Basel
  • University of Portsmouth
  • New Mexico State University
  • Chinese Academy of Sciences
  • Max-Planck-Gesellschaft
  • Max-Planck-Institut für Astronomie
  • University of California, Santa Barbara
  • Kavli Institute for Theoretical Physics, University of California, Santa Barbara (PHY05-51164)
  • Fermilab
  • Los Alamos National Laboratory
Topics
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Stellar, planetary, and galactic studies
  • Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Galaxies: Formation, Evolution, Phenomena
  • Physical Sciences › Physics and Astronomy › Instrumentation › Astronomy and Astrophysical Research
Keywords
RR Lyrae stars, Galactic halo substructure, light curve templates, photometric metallicity, main-sequence stars, halo formation, SDSS Stripe 82

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