Published in
American Astronomical Society, Astrophysical Journal Letters, 1(786), p. L3, 2014
DOI: 10.1088/2041-8205/786/1/l3
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A new distant Milky Way globular cluster in the Pan-STARRS1 3{π} survey
,
Nicolas F. Martin ,
Branimir Sesar,
Edouard J. Bernard ,
Hans-Walter Rix ,
Colin T. Slater ,
Eric F. Bell ,
Annette M. N. Ferguson,
Edward F. Schlafly ,
William S. Burgett ,
Kenneth C. Chambers,
Larry Denneau,
Peter W. Draper ,
Nicholas Kaiser ,
Rolf-Peter Kudritzki
and other authors.
Full text: Download
Abstract
We present a new satellite in the outer halo of the Galaxy, the first Milky Way satellite found in the stacked photometric catalog of the Panoramic Survey Telescope and Rapid Response System 1 (Pan-STARRS1) Survey. From follow-up photometry obtained with WFI on the MPG/ESO 2.2m telescope, we argue that the object, located at a heliocentric distance of 145+/-17 kpc, is the most distant Milky Way globular cluster yet known. With a total magnitude of M_V=-4.3+/-0.2 and a half-light radius of 20+/-2 pc, it shares the properties of extended globular clusters found in the outer halo of our Galaxy and the Andromeda galaxy. The discovery of this distant cluster shows that the full spatial extent of the Milky Way globular cluster system has not yet been fully explored. ; Comment: 6 pages, 4 figures, accepted