A New Distant Milky Way Globular Cluster in the Pan-STARRS1 3π Survey

Laevens, B.P.M.; Martin, N.F.; Sesar, B.; Bernard, E.J.; Rix, H.-W.; Slater, C.T.; Bell, E.F.; Ferguson, A.M.N.; Schlafly, E.F.; Burgett, W.S.; Chambers, K.C.; Denneau, L.; Draper, P.W.; Kaiser, N.; Kudritzki, R.-P.; Magnier, E.A.; Metcalfe, N.; Morgan, J.S.; Price, P.A.; Sweeney, W.E.; Tonry, J.L.; Wainscoat, R.J.; Waters, C.

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 2.2 m 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 MV = –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.

Citation

Laevens, B., Martin, N., Sesar, B., Bernard, E., Rix, H., Slater, C., …Waters, C. (2014). A New Distant Milky Way Globular Cluster in the Pan-STARRS1 3π Survey. Astrophysical Journal Letters, 786(1), Article L3. https://doi.org/10.1088/2041-8205/786/1/l3

• Journal Article Type: Article
• Acceptance Date: Mar 24, 2014
• Publication Date: May 1, 2014
• Deposit Date: Jun 16, 2015
• Publicly Available Date: Jun 30, 2015
• Journal: Astrophysical Journal Letters
• Print ISSN: 2041-8205
• Electronic ISSN: 2041-8213
• Publisher: American Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 786
• Issue: 1
• Article Number: L3
• DOI: https://doi.org/10.1088/2041-8205/786/1/l3
• Keywords: Globular clusters: individual (PSO J174.0675-10.8774), Local Group.
• Public URL: https://durham-repository.worktribe.com/output/1426876