Journal
ASTROPHYSICAL JOURNAL
Volume 762, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/762/1/6
Keywords
Galaxy: halo; Galaxy: structure; Local Group
Categories
Funding
- NSF grant [AST 1008342]
- Sonderforschungsbereich The Milky Way System of the German Research Foundation (DFG) [SFB 881, A3]
- Institute for Astronomy
- University of Hawaii
- Pan-STARRS Project Office
- Max-Planck Society
- Max Planck Institute for Astronomy, Heidelberg
- Max Planck Institute for Extraterrestrial Physics, Garching
- The Johns Hopkins University
- Durham University
- University of Edinburgh
- Queens University Belfast
- Harvard-Smithsonian Center for Astrophysics
- Las Cumbres Observatory Global Telescope Network, Incorporated
- National Central University of Taiwan
- National Aeronautics and Space Administration through the Planetary Science Division of the NASA Science Mission Directorate [NNX08AR22G]
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1008342, 1238877, 1009749] Funding Source: National Science Foundation
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We use data from the Pan-STARRS1 survey to present a panoramic view of the Sagittarius tidal stream in the southern Galactic hemisphere. As a result of the extensive sky coverage of Pan-STARRS1, the southern stream is visible along more than 60 degrees of its orbit, nearly double the length seen by the Sloan Digital Sky Survey. The recently discovered southern bifurcation of the stream is also apparent, with the fainter branch of the stream visible over at least 30 degrees. Using a combination of fitting both the main-sequence turnoff and the red clump, we measure the distance to both arms of the stream in the south. We find that the distances to the bright arm of the stream agree very well with the N-body models of Law & Majewski. We also find that the faint arm lies similar to 5 kpc closer to the Sun than the bright arm, similar to the behavior seen in the northern hemisphere.
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