Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A dwarf galaxy with a giant HI disk   We present Giant Meterwave Radio Telescope (GMRT) HI 21cm images of a nearby
dwarf irregular galaxy NGC 3741 (M_B ~ -13.13 mag) which show it to have a gas
disk that extends to ~ 8.3 times its Holmberg radius. This makes it probably
the most extended gas disk known. Our observations allow us to derive the
rotation curve (which is flat in the outer regions) out to ~ 38 optical scale
lengths. NGC 3741 has a dynamical mass to light ratio of ~ 107 and is one of
the ``darkest'' irregular galaxies known. However, the bulk of the baryonic
mass in NGC 3741 is in the form of gas and the ratio of the dynamic mass to the
baryonic mass (~ 8), falls within the range that is typical for galaxies. Thus
the dark matter halo of NGC 3741 has acquired its fair share of baryons, but
for some reason, these baryons have been unable to collapse to form stars. A
comparison of NGC 3741's dark halo properties with those of a sample of
galaxies with well measured rotation curves suggests that if one has to
reconcile the observations with the expectation that low mass galaxies suffer
fractionally greater baryon loss then baryon loss from halos occurs in such a
way that, in the net, the remaining baryons occupy a fractionally smaller
volume of the total halo.

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The categories of this paper are: eess
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The categories of this paper are: stat
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The categories of this paper are: supr-con
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The categories of this paper are: q-fin
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The categories of this paper are: nucl-th
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The categories of this paper are: math
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: patt-sol
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The categories of this paper are: nucl-ex
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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: chem-ph