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Serendipitous discovery of a thin stellar stream near the Galactic bulge in the Pan-STARRS1 3π Survey

Research output: Contribution to journalArticle

  • Edward F. Schlafly
  • Mohamad Abbas
  • Eric F. Bell
  • Niall R. Deacon
  • Nicolas F. Martin
  • Hans-Walter Rix
  • Branimir Sesar
  • Colin T. Slater
  • Rosemary F. G. Wyse
  • William S. Burgett
  • Kenneth C. Chambers
  • Peter W. Draper
  • Klaus W. Hodapp
  • Nicholas Kaiser
  • Rolf-Peter Kudritzki
  • Eugene A. Magnier
  • Nigel Metcalfe
  • Jeffrey S. Morgan
  • Paul A. Price
  • John L. Tonry
  • Richard J. Wainscoat
  • Christopher Waters

Related Edinburgh Organisations

Original languageEnglish
JournalMonthly Notices of the Royal Astronomical Society: Letters
Publication statusPublished - 1 Sep 2014


We report the discovery of a thin stellar stream found in Pan-STARRS1 photometry near the Galactic bulge in the constellation of Ophiuchus. It appears as a coherent structure in the colour-selected stellar density maps produced to search for tidal debris around nearby globular clusters. The stream is exceptionally short and narrow; it is about 2.5° long and 6 arcmin wide in projection. The colour-magnitude diagram of this object, which harbours a blue horizontal-branch, is consistent with an old and relatively metal-poor population ([Fe/H] ˜-1.3) located 9.5 ± 0.9 kpc away at (l, b) ˜ (5°, +32°), and 5.0 ± 1.0 kpc from the Galactic centre. These properties argue for a globular cluster as progenitor. The finding of such a prominent, nearby stream suggests that many streams could await discovery in the more densely populated regions of our Galaxy.

    Research areas

  • surveys, globular clusters: general, Galaxy: halo, Galaxy: structure

ID: 18632365