Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Figure Rotation and the Mass of the Galactic Bulge   The mass of the Galactic bulge, $M_B$, is estimated from the tensor virial
theorem. By including the effects of a barred stellar distribution and figure
rotation (81 \kms kpc $^{-1}$) and by assuming that the bar is oriented at
$\theta$ $=$ 20\deg \ to our line of sight, $M_B$ is found to be as high as
2.8$\times$10$^{10}$ M$_{\odot}$. This estimate is in good agreement with the
total mass inferred from the observed optical depth to microlensing for stars
toward the inner Galaxy. For larger angles, $\theta$ $\sim$ 40\deg, or smaller
pattern speeds (20 \kms kpc $^{-1}$), $M_B$ is found to be $\sim$ 1.7 $-$
1.9$\times$10$^{10}$ M$_{\odot}$, similar to previous estimates for a barred
bulge (2$\times$10$^{10}$ M$_{\odot}$) and axisymmetric bulge
(1.8$\times$10$^{10}$ M$_{\odot}$).

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The categories of this paper are: comp-gas
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The categories of this paper are: hep-th
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The categories of this paper are: alg-geom
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The categories of this paper are: funct-an
3
The categories of this paper are: physics
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The categories of this paper are: atom-ph
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The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
5
The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: quant-ph
2
The categories of this paper are: math
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci