Big fish, little fish: Two new ultra-faint satellites of the milky way

V. Belokurov, M. G. Walker, N. W. Evans, G. Gilmore, M. J. Irwin, D. Just, S. Koposov, M. Mateo, Edward W Olszewski, L. Watkins, L. Wyrzykowski

Research output: Contribution to journalArticle

132 Citations (Scopus)

Abstract

We report the discovery of two new Milky Way satellites in the neighboring constellations of Pisces and Pegasus identified in data from the Sloan Digital Sky Survey. Pisces II, an ultra-faint dwarf galaxy lies at the distance of 180 kpc, some 15°away from the recently detected Pisces I. Segue 3, an ultra-faint star cluster lies at the distance of 16 kpc. We use deep follow-up imaging obtained with the 4-m Mayall Telescope at Kitt Peak National Observatory to derive their structural parameters. Pisces II has a half-light radius of 60 pc, while Segue 3 is 20 times smaller at only 3 pc.

Original languageEnglish (US)
JournalAstrophysical Journal Letters
Volume712
Issue number1 PART 2
DOIs
StatePublished - 2010

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Keywords

  • Galaxies: dwarf
  • Galaxies: individual (Pisces, Pegasus)
  • Local Group

ASJC Scopus subject areas

  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Belokurov, V., Walker, M. G., Evans, N. W., Gilmore, G., Irwin, M. J., Just, D., ... Wyrzykowski, L. (2010). Big fish, little fish: Two new ultra-faint satellites of the milky way. Astrophysical Journal Letters, 712(1 PART 2). https://doi.org/10.1088/2041-8205/712/1/L103

Big fish, little fish : Two new ultra-faint satellites of the milky way. / Belokurov, V.; Walker, M. G.; Evans, N. W.; Gilmore, G.; Irwin, M. J.; Just, D.; Koposov, S.; Mateo, M.; Olszewski, Edward W; Watkins, L.; Wyrzykowski, L.

In: Astrophysical Journal Letters, Vol. 712, No. 1 PART 2, 2010.

Research output: Contribution to journalArticle

Belokurov, V, Walker, MG, Evans, NW, Gilmore, G, Irwin, MJ, Just, D, Koposov, S, Mateo, M, Olszewski, EW, Watkins, L & Wyrzykowski, L 2010, 'Big fish, little fish: Two new ultra-faint satellites of the milky way', Astrophysical Journal Letters, vol. 712, no. 1 PART 2. https://doi.org/10.1088/2041-8205/712/1/L103
Belokurov, V. ; Walker, M. G. ; Evans, N. W. ; Gilmore, G. ; Irwin, M. J. ; Just, D. ; Koposov, S. ; Mateo, M. ; Olszewski, Edward W ; Watkins, L. ; Wyrzykowski, L. / Big fish, little fish : Two new ultra-faint satellites of the milky way. In: Astrophysical Journal Letters. 2010 ; Vol. 712, No. 1 PART 2.
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