A new distant Milky Way globular cluster in the Pan-STARRS1 3{\pi} survey
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.
Keywords
Cite
@article{arxiv.1403.6593,
title = {A new distant Milky Way globular cluster in the Pan-STARRS1 3{\pi} survey},
author = {Benjamin P. M. Laevens and Nicolas F. Martin and Branimir Sesar and Edouard J. Bernard and Hans-Walter Rix and Colin T. Slater and Eric F. Bell and Annette M. N. Ferguson and Edward F. Schlafly and William S. Burgett and Kenneth C. Chambers and Larry Denneau and Peter W. Draper and Nicholas Kaiser and Rolf-Peter Kudritzki and Eugene A. Magnier and Nigel Metcalfe and Jeffrey S. Morgan and Paul A. Price and William E. Sweeney and John L. Tonry and Richard J. Wainscoat and Christopher Waters},
journal= {arXiv preprint arXiv:1403.6593},
year = {2015}
}
Comments
6 pages, 4 figures, accepted