Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Field Stars and Clusters of the Galactic Bulge: Implications for Galaxy
  Formation   The results of a kinematic study of the Galactic bulge based on spectra of
red giants in fields at projected distances of 1.4-1.8 kpc from the Galactic
center are presented. There is a marked trend of kinematics with metallicity,
in the sense that the more metal-poor population has higher velocity dispersion
and lower rotation velocity than the metal-rich population. The K giants more
metal--poor than [Fe/H] = -1 have halo-like kinematics, with no significant
rotation and sigma = 120 km/s independent of Galactocentric distance. The
velocity dispersion of the giants with [Fe/H] > -1 decreases with increasing
Galactocentric distance, and this population is rotating with V = 0.9
km/s/degree. The present observations, together with the observed metallicity
gradient imply bulge formation through dissipational collapse. In such a
picture, low angular momentum gas lost from the formation of the halo was
deposited in the bulge. The bulge would then be younger than the halo.
Observations of the Galactic globular cluster system are consistent with this
picture, if we associate the metal-rich globular clusters within 3 kpc of the
Galactic center with the bulge rather than with the thick disk or halo. Data on
the RR Lyr in Baade's window are also consistent with this picture if these
stars are considered part of the inner halo rather than the bulge.

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The categories of this paper are: gr-qc
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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: math-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: solv-int
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The categories of this paper are: mtrl-th
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The categories of this paper are: q-alg
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The categories of this paper are: eess
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The categories of this paper are: quant-ph