SIMBAD references

2003ApJ...594L.119C - Astrophys. J., 594, L119-L122 (2003/September-2)

Exploring halo substructure with giant stars: spectroscopy of stars in the Galactic Anticenter stellar structure.

CRANE J.D., MAJEWSKI S.R., ROCHA-PINTO H.J., FRINCHABOY P.M., SKRUTSKIE M.F. and LAW D.R.

Abstract (from CDS):

To determine the nature of the recently discovered, ringlike stellar structure at the Galactic anticenter, we have collected spectra of a set of presumed constituent M giants selected from the Two Micron All Sky Survey Point Source Catalog. Radial velocities have been obtained for stars spanning ∼100°, exhibiting a trend in velocity with Galactic longitude and an estimated dispersion of σv=20±4 km/s. 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 noncircular, prograde orbit about the Milky Way.

Abstract Copyright:

Journal keyword(s): Galaxies: Interactions - Galaxy: Disk - Galaxy: Structure

CDS comments: Parag. 6.4 : BH 176 = Cl VDBH 176

Simbad objects: 9

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