Magnetic fields in star-forming galaxies at high and low redshift

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dc.creatorGarn, Timothy
dc.creatorFord, Dominic
dc.creatorAlexander, Paul
dc.creatorGreen, David A.
dc.creatorRiley, Julia M.
dc.date2008-06-05
dc.date2008-06-12
dc.date.accessioned2026-07-07T09:43:55Z
dc.date.available2026-07-07T09:43:55Z
dc.descriptionAs 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.
dc.description5 pages, 3 figures. To Appear in "The Modern Radio Universe: From Planets to Dark Energy" Conference Proceedings (Oct 1-5 2007, The University of Manchester) Editors: Beswick, Diamond & Schilizzi. Updated to reflect resubmission of MNRAS paper
dc.identifierhttps://arxiv.org/abs/0806.1014
dc.identifierhttp://arxiv.org/abs/0806.1014
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/162688
dc.subjectAstrophysics
dc.titleMagnetic fields in star-forming galaxies at high and low redshift
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