A Pan-STARRS1 VIEW OF THE BIFURCATED SAGITTARIUS STREAM

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...

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Bibliographic Details
Published in:The Astrophysical journal 2013-01, Vol.762 (1), p.1-9
Main Authors: Slater, C T, Bell, E F, Schlafly, E F, Juric, M, Martin, N F, Rix, H-W, Bernard, E J, Burgett, W S, Chambers, K C, Finkbeiner, D P
Format: Article
Language:English
Subjects:
ASTRONOMY
ASTROPHYSICS
ASTROPHYSICS, COSMOLOGY AND ASTRONOMY
Bifurcations
Clumps
DISTANCE
Fittings
Hemispheres
MILKY WAY
NORTHERN HEMISPHERE
ORBITS
Sky surveys (astronomy)
STAR MODELS
Streams
SUN
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Summary: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 ~5 kpc closer to the Sun than the bright arm, similar to the behavior seen in the northern hemisphere.
ISSN:0004-637X
1538-4357
DOI:10.1088/0004-637X/762/1/6