Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Absolute Proper Motion of the Canis Major Dwarf Galaxy Candidate   We have measured the absolute proper motion of the candidate Canis Major
dwarf galaxy (CMa) at $(l,b) = (240\arcdeg, -8\arcdeg)$. Likely main-sequence
stars in CMa have been selected from a region in the color-magnitude diagram
that has very little contamination from known Milky Way components. We obtain
$\mu_{l} cos b = -1.47 \pm 0.37$ and $\mu_{b} = -1.07 \pm 0.38$ mas yr$^{-1}$,
on the ICRS system via Hipparcos stars. Together with the radial velocity of
109 km s$^{-1}$, and the assumed distance of 8 kpc, these results imply a space
motion of $(\Pi, \Theta, W) = (-5 \pm 12, 188 \pm 10, -49 \pm 15)$ km s$^{-1}$.
While CMa has in-plane rotation similar to the mean of thick disk stars, it
shows significant $(3\sigma)$ motion perpendicular to the disk, and differs
even more $(7\sigma)$ from that expected for the Galactic warp. The $W$
velocity lends support to the argument that the CMa overdensity is part of a
satellite galaxy remnant.

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The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: physics
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The categories of this paper are: patt-sol
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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: math
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The categories of this paper are: quant-ph
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The categories of this paper are: q-fin
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The categories of this paper are: supr-con
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The categories of this paper are: bayes-an
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
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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: nucl-ex