Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Molecular and atomic line surveys of galaxies II: unbiased estimates of
  their star formation mode   We make use of our 'minimal' cold interstellar medium (ISM) emission line
model that predicts the molecular and atomic line emission per unit dense,
star-forming gas mass (Geach & Papadopoulos 2012; Paper I) to examine the
utility of key line ratios in surveys of the so-called star formation 'mode' as
traced by xi_SF = M_dense(H_2)/M_total(H_2). We argue that xi_SF and its
proxies provide very sensitive, extinction-free discriminators of rapid
starburst/merger-driven versus secular quiescent/disk-like stellar mass
assembly, with the most promising diagnostic to be applied in the near-future
being CO(4-3)/[CI](1-0). These lines are accessible across nearly the full
range 0<z<2 (thus covering the bulk of galaxy evolution) with the Atacama Large
Millimeter Array. In addition to their diagnostic power, another advantage of
this combination is the similar observed frequencies (Delta nu_0 ~ 30 GHz) of
the lines, resulting in nearly spatially-matched beams for a fixed aperture,
thus mitigating the effects of resolution/morphology bias in the interpretation
of galaxy-averaged line ratios. Finally we discuss the capability of deep blind
redshift surveys with the high frequency component of the Square Kilometer
Arrray (SKA) in discovering H_2-rich galaxies with very low xi_SF values. These
could be the progenitors of starburst galaxies seen prior to the onset of star
formation; such galaxies could be a class of extreme outliers from local (gas
surface density)-(star formation rate) scaling laws, which would exclude them
from current star formatation or stellar mass selected samples. Our
conservative model suggests that SKA could detect such systems residing at z~3
at a rate of 20-200 per hour.

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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
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The categories of this paper are: math
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The categories of this paper are: math-ph
7
The categories of this paper are: hep-th
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The categories of this paper are: nlin
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The categories of this paper are: nucl-th
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: ao-sci
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The categories of this paper are: q-alg
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The categories of this paper are: plasm-ph
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The categories of this paper are: cond-mat
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The categories of this paper are: solv-int
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The categories of this paper are: hep-ph