Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Galaxy Merger Morphologies and Time-Scales from Simulations of
  Equal-Mass Gas-Rich Disc Mergers   A key obstacle to understanding the galaxy merger rate and its role in galaxy
evolution is the difficulty in constraining the merger properties and
time-scales from instantaneous snapshots of the real universe.The most common
way to identify galaxy mergers is by morphology, yet current theoretical
calculations of the time-scales for galaxy disturbances are quite crude. We
present a morphological analysis of a large suite of GADGET
N-Body/hydro-dynamical equal-mass gas-rich disc galaxy mergers which have been
processed through the Monte-Carlo radiative transfer code SUNRISE. With the
resulting images, we examine the dependence of quantitative morphology (G, M20,
C, A) in the SDSS g-band on merger stage, dust, viewing angle, orbital
parameters, gas properties, supernova feedback, and total mass. We find that
mergers appear most disturbed in G-M20 and asymmetry at the first pass and at
the final coalescence of their nuclei, but can have normal quantitative
morphologies at other merger stages. The merger observability time-scales
depend on the method used to identify the merger as well as the gas fraction,
pericentric distance, and relative orientation of the merging galaxies.
Enhanced star formation peaks after and lasts significantly longer than strong
morphological disturbances. Despite their massive bulges, the majority of
merger remnants appear disc-like and dusty in g-band light because of the
presence of a low-mass star-forming disc.

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The categories of this paper are: cs
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
28
The categories of this paper are: alg-geom
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The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys
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The categories of this paper are: econ
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg
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The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
10
The categories of this paper are: q-bio
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The categories of this paper are: nlin
29
The categories of this paper are: funct-an