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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 448339.0, MPI für Astronomie / Publikationen_mpia
Tracing Sagittarius structure with SDSS and SEGUE imaging and spectroscopy
Authors:Yanny, B.; Newberg, H. J.; Johnson, J. A.; Lee, Y. S.; Beers, T. C.; Bizyaev, D.; Brewington, H.; Fiorentin, P. R.; Harding, P.; Malanushenko, E.; Malanushenko, V.; Oravetz, D.; Pan, K.; Simmons, A.; Snedden, S.
Date of Publication (YYYY-MM-DD):2009
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Issue / Number:2
Start Page:1282
End Page:1298
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We show that the Sagittarius dwarf tidal stream can be traced with very red K/M-giant stars, selected from Sloan Digital Sky Survey (SDSS) photometry. A subset of these stars are spectroscopically confirmed with SEGUE and SDSS spectra, and the distance scale of 2MASS and SDSS M giants is calibrated to the RR Lyrae distance scale. The absolute magnitude of the K/M-giant stars at the tip of the giant branch is M-g0 = -1.0. The line-of-sight velocities of the M giant and blue horizontal-branch (BHB) stars that are spatially coincident with the Sgr dwarf tidal stream are consistent with those of previous authors, reinforcing the need for new models that can explain all of the Sgr tidal debris stream observations. We estimate stellar densities along the tidal tails that can be used to help constrain future models. The K/M giant, BHB, and F-turnoff stars in the lower surface brightness tidal stream that is adjacent to the main leading Sgr dwarf tidal tail have velocities and metallicities that are similar to those of the stars in the leading tidal tail. The ratio of K/M giants to BHBs and BHBs to F-turnoff stars are also similar for both branches of the leading tidal tail. We show that there is an additional low-metallicity tidal stream near the Sgr trailing tidal tail.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.1088/0004-637x/700/2/1282 [ID No:1]
URL:<Go to ISI>://WOS:000268098100036 [ID No:2]
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