Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hierarchical Disk Galaxy Assembly as the Origin of Scatter in the z~1
  Stellar Mass Tully-Fisher Relation   Recent observations of distant disk galaxies show that there is little to no
evolution in the relation between maximum rotation speed and stellar mass at z
< 1.2. There is however a significant scatter between these two quantities
whose origin is uncertain. We show in this paper that this scatter is at least
partially the result of galaxy merging, revealing that disk galaxy growth at z
< 1 is fundamentally hierarchical. We carry this out by calculating CAS
(concentration, asymmetry, clumpiness) structural parameters using archival
Hubble Space Telescope imaging of 91 high-redshift disk galaxies at 0.4 < z <
1.0 with robustly measured stellar masses and rotational maximum velocities
taken from Conselice et al. (2005). We separate our sample into two redshift
bins divided at z = 0.7, and investigate deviations from the stellar-mass
Tully-Fisher relation in both the M_* and V_max directions, and how these
correlate with structural asymmetries. We find a significant (> 3 sigma)
correlation between the residuals from the stellar-mass Tully-Fisher relation
in both the M_* and V_max directions, and high asymmetries. This result holds
after we remove contributions from star formation and edge-on galaxies which
can produce higher asymmetries unrelated to merging. While there are a few
cases in which our disk galaxies have very large asymmetries, and are
potentially involved in major mergers, in general these asymmetries are smaller
than the major merger limit. It is therefore likely that these galaxies are
forming hierarchically through minor galaxy mergers, which is also suggested by
the constant slope and zero point of the stellar mass Tully-Fisher relation
during the same epoch.

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The categories of this paper are: supr-con
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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: hep-th
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The categories of this paper are: hep-ex
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The categories of this paper are: chao-dyn
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The categories of this paper are: hep-ph
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The categories of this paper are: cs
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The categories of this paper are: nucl-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: math
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The categories of this paper are: stat