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A new faint Milky Way satellite discovered in the Pan-STARRS1 3π Survey.

Laevens, B. P. M. and Martin, N. F. and Ibata, R. A. and Rix, H.-W. and Bernard, E. J. and Bell, E. F. and Sesar, B. and Ferguson, A. M. N. and Schlafly, E. F. and Slater, C. T. and Burgett, W. S. and Chambers, K. C. and Flewelling, H. and Hodapp, K. A. and Kaiser, N. and Kudritzki, R.-P. and Lupton, R. H. and Magnier, E. A. and Metcalfe, N. and Morgan, J. S. and Price, P. A. and Tonry, J. L. and Wainscoat, R. J. and Waters, C. (2015) 'A new faint Milky Way satellite discovered in the Pan-STARRS1 3π Survey.', Astrophysical journal letters., 802 (2). L18.


We present the discovery of a faint Milky Way satellite, Laevens 2/Triangulum II, found in the Panoramic Survey Telescope And Rapid Response System (Pan-STARRS 1) 3 pi imaging data and confirmed with follow-up wide-field photometry from the Large Binocular Cameras. The stellar system, with an absolute magnitude of M_V=-1.8 +/-0.5, a heliocentric distance of 30 +2/-2 kpc, and a half-mass radius of 34 +9/-8 pc, shows remarkable similarity to faint, nearby, small satellites such as Willman 1, Segue 1, Segue 2, and Bo\"otes II. The discovery of Laevens 2/Triangulum II further populates the region of parameter space for which the boundary between dwarf galaxies and globular clusters becomes tenuous. Follow-up spectroscopy will ultimately determine the nature of this new satellite, whose spatial location hints at a possible connection with the complex Triangulum-Andromeda stellar structures.

Item Type:Article
Keywords:Galaxies: dwarf, Galaxy: structure, Globular clusters: general, Local Group.
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Publisher statement:© 2015. The American Astronomical Society. All rights reserved.
Record Created:03 Sep 2015 12:05
Last Modified:09 Mar 2017 15:31

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