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17 April 2024 |
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Article overview
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Exploring Halo Substructure with Giant Stars: Spectroscopy of Stars in the Galactic Anticenter Stellar Structure | Jeffrey D. Crane
; Steven R. Majewski
; Helio J. Rocha-Pinto
; Peter M. Frinchaboy
; Michael F. Skrutskie
; David R. Law
; | Date: |
29 Jul 2003 | Journal: | Astrophys.J. 594 (2003) L119-L122 | Subject: | astro-ph | Abstract: | To determine the nature of the recently discovered, ring-like stellar structure at the Galactic anticenter, we have collected spectra of a set of presumed constituent M giants selected from the 2MASS point source catalog. Radial velocities have been obtained for stars spanning ~100 degrees, exhibiting a trend in velocity with Galactic longitude and an estimated dispersion of 20 +/- 4 km/sec. A mean metallicity [Fe/H] = -0.4 +/- 0.3 measured for these stars combines with previous evidence from the literature to suggest a population with a significant metallicity spread. In addition, a curious alignment of at least four globular clusters of lower mean metallicity is noted to be spatially and kinematically consistent with this stellar distribution. We interpret the M giant sample position and velocity variation with Galactic longitude as suggestive of a satellite galaxy currently undergoing tidal disruption in a non-circular, prograde orbit about the Milky Way. | Source: | arXiv, astro-ph/0307505 | Services: | Forum | Review | PDF | Favorites |
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