Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Magnetic fields in star-forming galaxies at high and low redshift   As part of an ongoing series of deep GMRT surveys we have observed the
Spitzer extragalactic First Look Survey field, producing the deepest wide-field
610-MHz survey published to date. We reach an rms noise of 30 microJy/beam
before primary beam correction, with a resolution of ~6 arcsec over an area of
~4 square degrees. By combining these observations with the existing 1.4-GHz
VLA survey produced by Condon et al. (2003), along with infrared data in up to
seven wavebands from the Spitzer Space Telescope, optical photometry from SDSS
and a range of spectroscopic redshift surveys, we are able to study the
relationship between radio luminosity and star formation rate in star-forming
galaxies up to z ~ 1. The large amount of multi-wavelength data available
allows accurate k-corrections to be performed in the radio due to the knowledge
of the radio spectral index, and in the infrared through the use of a
semi-empirical radiative transfer model which models star-forming regions, warm
dust surrounding these regions, and diffuse interstellar dust, taking into
account the star formation rate, star formation history and hydrogen column
density within each galaxy. A strong correlation is seen between radio
luminosity and infrared-derived star formation rates, which is best fit by a
slightly non-linear power-law. We look for cosmic evolution in the comparative
radio brightness of star-forming galaxies by searching for deviations away from
the global relationship. Any such deviation would indicate a systematic
variation in one or more of the properties controlling synchrotron radiation,
in particular an increase in the magnetic field strengths of star-forming
galaxies. The data shows no evidence for such an effect, suggesting that there
has been little evolution in the magnetic fields of galaxies since z ~ 1.

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The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
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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: solv-int
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The categories of this paper are: cmp-lg
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The categories of this paper are: math
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: hep-ph
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The categories of this paper are: supr-con
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: dg-ga
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The categories of this paper are: eess
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The categories of this paper are: physics