Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: CO versus HI in the Tully-Fisher relation for a sample of 32 galaxies   As a basic step for establishing the CO-line Tully-Fisher relation for
distant galaxies, we made a comparative study of HI versus CO line profiles.
Total line profiles of the CO line emission from 32 galaxies have been compared
with the corresponding HI emission. We found a good correlation between the
profiles of CO and HI. This strongly supports the thesis that CO can be used in
the Tully-Fisher relation for distant galaxies where HI observations cannot
reach. We also argue that CO can be used as an alternative to HI for
un-isolated galaxies such as those in dense cluster of galaxies. Using the
B-magnitudes and a recent calibration of the HI Tully-Fisher relation, we give
the distances for the galaxies derived from the CO-line Tully-Fisher relation
and compare them with the corresponding HI distances.

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The categories of this paper are: funct-an
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The categories of this paper are: stat
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The categories of this paper are: eess
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The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: cmp-lg
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The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
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The categories of this paper are: econ