Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The small scatter of the baryonic Tully-Fisher relation   In a LCDM cosmology, the baryonic Tully-Fisher relation (BTFR) is expected to
show significant intrinsic scatter resulting from the mass-concentration
relation of dark matter halos and the baryonic-to-halo mass ratio. We study the
BTFR using a sample of 118 disc galaxies (spirals and irregulars) with data of
the highest quality: extended HI rotation curves (tracing the outer velocity)
and Spitzer photometry at 3.6 $\mu$m (tracing the stellar mass). Assuming that
the stellar mass-to-light ratio (M*/L) is nearly constant at 3.6 $\mu$m, we
find that the scatter, slope, and normalization of the BTFR systematically vary
with the adopted M*/L. The observed scatter is minimized for M*/L > 0.5,
corresponding to nearly maximal discs in high-surface-brightness galaxies and
BTFR slopes close to ~4. For any reasonable value of M*/L, the intrinsic
scatter is ~0.1 dex, below general LCDM expectations. The residuals show no
correlations with galaxy structural parameters (radius or surface brightness),
contrary to the predictions from some semi-analytic models of galaxy formation.
These are fundamental issues for LCDM cosmology.

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The categories of this paper are: q-alg
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The categories of this paper are: comp-gas
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The categories of this paper are: chem-ph
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The categories of this paper are: stat
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The categories of this paper are: hep-ex
1
The categories of this paper are: cs
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The categories of this paper are: eess
5
The categories of this paper are: gr-qc
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The categories of this paper are: funct-an
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The categories of this paper are: nlin
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The categories of this paper are: dg-ga
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The categories of this paper are: q-bio
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The categories of this paper are: math-ph
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The categories of this paper are: bayes-an
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin