Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Redshift and Mass Dependence on the Formation of The Hubble Sequence
  at z>1 from CANDELS/UDS   In this paper we present a detailed study of the structures and morphologies
of a sample of 1188 massive galaxies with Mstar>10^10Msun between redshifts
z=1-3 within the Ultra Deep Survey (UDS) region of the Cosmic Assembly
Near-infrared Deep Extragalactic Legacy Survey (CANDELS) field. Using this
sample we determine how galaxy structure and morphology evolve with time. We
visually classify our sample into disks, ellipticals and peculiar systems and
correct for redshift effects on our classifications through simulations. We
find evolution in the fractions of galaxies at a given visual classification as
a function of redshift. The peculiar population is dominant at z>2 with a
substantial spheroid population, and a negligible disk population. We compute
the transition redshift, ztrans, where the combined fraction of spheroids and
disks is equal to that of peculiar galaxies, as ztrans=1.86+/-0.62 for galaxies
in our stellar mass range. We find that this changes as a function of stellar
mass, with Hubble-type systems becoming dominant at higher redshifts for higher
mass galaxies (ztrans=2.22+/-0.82), than for the lower mass galaxies
(ztrans=1.73+/-0.57). Higher mass galaxies become morphologically settled
before their lower mass counterparts, a form of morphological downsizing. We
furthermore compare our visual classifications with Sersic index, the
concentration, asymmetry and clumpiness (CAS) parameters, star formation rate
and rest frame U-B colour. We find links between the colour of a galaxy, its
star formation rate and how extended or peculiar it appears. Finally, we
discuss the negligible z>2 disk fraction based on visual morphologies and
speculate that this is an effect of forming disks appearing peculiar through
processes such as violent disk instabilities or mergers. We conclude that to
properly define high redshift morphology a new and more exact classification
scheme is needed.

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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
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The categories of this paper are: patt-sol
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The categories of this paper are: dg-ga
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The categories of this paper are: nucl-th
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The categories of this paper are: funct-an
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The categories of this paper are: supr-con
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The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: gr-qc
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-ex
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The categories of this paper are: q-bio
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The categories of this paper are: acc-phys
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The categories of this paper are: math