Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The minor role of gas-rich major mergers in the rise of
  intermediate-mass early types at z <~ 1   We study the evolution of galaxy structure since z ~ 1 to the present. From a
GOODS-S multi-band catalog we define (blue) luminosity- and mass-weighted
samples, limited by M_B <= -20 and M_star >= 10^10 M_Sun, comprising 1122 and
987 galaxies, respectively. We extract early-type (E/S0/Sa) and late-type
(Sb-Irr) subsamples by their position in the concentration-asymmetry plane, in
which galaxies exhibit a clear bimodality.
  We find that the early-type fraction, f_ET, rises with cosmic time, with a
corresponding decrease in the late-type fraction, f_LT, in both luminosity- and
mass-selected samples. However, the evolution of the comoving number density is
very different: the decrease in the total number density of M_B <= -20 galaxies
since z = 1 is due to the decrease in the late-type population, which accounts
for ~75% of the total star-formation rate in the range under study, while the
increase in the total number density of M_star >= 10^10 M_Sun galaxies in the
same redshift range is due to the evolution of early types. This suggests that
we need a structural transformation between late-type galaxies that form stars
actively and early-type galaxies in which the stellar mass is located.
  Comparing the observed evolution with the gas-rich major merger rate in
GOODS-S, we infer that only ~20% of the new early-type galaxies with M_star >=
10^10 M_Sun appeared since z ~ 1 can be explained by this kind of mergers,
suggesting that minor mergers and secular processes may be the driving
mechanisms of the structural evolution of intermediate-mass (M_star ~ 4x10^10
M_Sun) galaxies since z ~ 1.

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The categories of this paper are: eess
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
35
The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org
13
The categories of this paper are: quant-ph
0
The categories of this paper are: hep-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: hep-lat
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The categories of this paper are: physics