Journal
ASTROPHYSICAL JOURNAL
Volume 813, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/813/1/44
Keywords
galaxies: dwarf; Galaxy: structure; globular clusters: general; Local Group
Categories
Funding
- Strasbourg IDEX (Initiative d'Excellence) grant - University of Strasbourg
- CNRS through PICS [PICS06183]
- DFG [SFB 881]
- NSF [AST 1008342]
- National Aeronautics and Space Administration through the Planetary Science Division of the NASA Science Mission Directorate [NNX08AR22G]
- National Science Foundation [AST-1238877]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1008342, 1238877] Funding Source: National Science Foundation
Ask authors/readers for more resources
We present the discovery of three new Milky Way satellites from our search for compact stellar overdensities in the photometric catalog of the Panoramic Survey Telescope and Rapid Response System 1 (Pan-STARRS 1, or PS1) 3 pi survey. The first satellite, Laevens 3, is located at a heliocentric distance of d = 67 +/- 3 kpc. With a total magnitude of M-V = -4.4 +/- 0.3 and a half-light radius of r(h) = 7 +/- 2 pc, its properties resemble those of outer halo globular clusters. The second system, Draco II/Laevens 4, is a closer and fainter satellite (d similar to 20 kpc, M-V = -2.9 +/- 0.8), whose uncertain size (r(h) = 19(-6)(+8) pc) renders its classification difficult without kinematic information; it could either be a faint and extended globular cluster or a faint and compact dwarf galaxy. The third satellite, Sagittarius II/Laevens 5 (Sgr II), has an ambiguous nature, as it is either the most compact dwarf galaxy or the most extended globular cluster in its luminosity range (r(h) 37(-8)(+9) pc and M-V = -5.2 +/- 0.4). At a heliocentric distance of 67 +/- 5 kpc, this satellite lies intriguingly close to the expected location of the trailing arm of the Sagittarius stellar stream behind the Sagittarius dwarf spheroidal galaxy (Sgr dSph). If confirmed through spectroscopic follow up, this connection would locate this part of the trailing arm of the Sagittarius stellar stream that has so far gone undetected. It would further suggest that Sgr II was brought into the Milky Way halo as a satellite of the Sgr dSph.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available