Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Gaseous Trail of the Sagittarius Dwarf Galaxy   A possible gaseous component to the stream of debris from the Sagittarius
dwarf galaxy is presented. We identify 4 - 10 x 10^6 Msun of neutral hydrogen
along the orbit of the Sgr dwarf in the direction of the Galactic anticenter
(at 36 kpc, the distance to the stellar debris in this region). This is 1-2% of
the estimated total mass of the Sgr dwarf. Both the stellar and gaseous
components have negative velocities, but the gaseous component extends to
higher negative velocities. If associated, this gaseous stream was most likely
stripped from the main body of the dwarf 0.2 - 0.3 Gyr ago during its current
orbit after a passage through a diffuse edge of the Galactic disk with a
density > 10^{-4} cm^{-3}. This gas represents the dwarf's last source of star
formation fuel and explains how the galaxy was forming stars 0.5-2 Gyr ago.

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The categories of this paper are: mtrl-th
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The categories of this paper are: supr-con
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The categories of this paper are: q-alg
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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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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: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: acc-phys
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The categories of this paper are: q-bio
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-th