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Exploring Halo Substructure with Giant Stars III: First Results from the Grid Giant Star Survey and Discovery of a Possible Nearby Sagittarius Tidal Structure in Virgo | | A. Kundu
; S.R. Majewski
; J. Rhee
; H.J. Rocha-Pinto
; A.A. Polak
; C.L. Slesnick
; W.E. Kunkel
; K.V. Johnston
; R.J. Patterson
; D. Geisler
; W. Gieren
; J. Seguel
; V.V. Smith
; C. Palma
; J. Arenas
; J.D. Crane
; C.B. Hummels
; | | Date: |
14 Aug 2002 | | Journal: | Astrophys.J. 576 (2002) L125-L130 | | Subject: | astro-ph | | Abstract: | We describe first results of a spectroscopic probe of selected fields from the Grid Giant Star Survey. Multifiber spectroscopy of several hundred stars in a strip of eleven fields along delta approximately -17^{circ}, in the range 12 <~ alpha <~ 17 hours, reveals a group of 8 giants that have kinematical characteristics differing from the main field population, but that as a group maintain coherent, smoothly varying distances and radial velocities with position across the fields. Moreover, these stars have roughly the same abundance, according to their MgH+Mgb absorption line strengths. Photometric parallaxes place these stars in a semi-loop structure, arcing in a contiguous distribution between 5.7 and 7.9 kpc from the Galactic center. The spatial, kinematical, and abundance coherence of these stars suggests that they are part of a diffuse stream of tidal debris, and one roughly consistent with a wrapped, leading tidal arm of the Sagittarius dwarf spheroidal galaxy. | | Source: | arXiv, astro-ph/0208276 | | Services: | Forum | Review | PDF | Favorites | |
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