Astrometry with digital sky surveys: From SDSS to LSST

Ž Ivezić, D. G. Monet, N. Bond, M. Jurić, B. Sesar, J. A. Munn, R. H. Lupton, J. E. Gunn, G. R. Knapp, A. J. Tyson, P. Pinto, K. Cook

Research output: Contribution to journalArticle

Abstract

Major advances in our understanding of the Universe have historically come from dramatic improvements in our ability to accurately measure astronomical quantities. The astrometric observations obtained by modern digital sky surveys are enabling unprecedentedly massive and robust studies of the kinematics of the Milky Way. For example, the astrometric data from the Sloan Digital Sky Survey (SDSS), together with half a century old astrometry from the Palomar Observatory Sky Survey (POSS), have enabled the construction of a catalog that includes absolute proper motions as accurate as 3 mas/year for about 20 million stars brighter than V=20, and for 80,000 spectroscopically confirmed quasars which provide exquisite error assessment. We discuss here several ongoing studies of Milky Way kinematics based on this catalog. The upcoming next-generation surveys will maintain this revolutionary progress. For example, we show using realistic simulations that the Large Synoptic Survey Telescope (LSST) will measure proper motions accurate to 1 mas/year to a limit 4 magnitude fainter than possible with SDSS and POSS catalogs, or with the Gaia survey. LSST will also obtain geometric parallaxes with accuracy similar to Gaia's at its faint end (0.3 mas at V=20), and extend them to V=24 with an accuracy of 3 mas. We discuss the impact that these LSST measurements will have on studies of the Milky Way kinematics, and potential synergies with the Gaia survey.

Original languageEnglish (US)
Pages (from-to)537-543
Number of pages7
JournalProceedings of the International Astronomical Union
Volume3
Issue numberS248
DOIs
StatePublished - Oct 1 2007

Keywords

  • Astrometry
  • Catalogs
  • Surveys

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Astronomy and Astrophysics
  • Nutrition and Dietetics
  • Public Health, Environmental and Occupational Health
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Astrometry with digital sky surveys: From SDSS to LSST'. Together they form a unique fingerprint.

  • Cite this

    Ivezić, Ž., Monet, D. G., Bond, N., Jurić, M., Sesar, B., Munn, J. A., Lupton, R. H., Gunn, J. E., Knapp, G. R., Tyson, A. J., Pinto, P., & Cook, K. (2007). Astrometry with digital sky surveys: From SDSS to LSST. Proceedings of the International Astronomical Union, 3(S248), 537-543. https://doi.org/10.1017/S1743921308020103