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The resolved radio–FIR correlation in nearby galaxies with Herschel and Spitzer

Published online by Cambridge University Press:  17 August 2012

Fatemeh S. Tabatabaei ,
Eva Schinnerer ,
Eric Murphy ,
Rainer Beck ,
Annie Hughes  and
Brent Groves
Fatemeh S. Tabatabaei
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117-Heidelberg, Germany email: taba@mpia.de email: taba@mpia.de email: taba@mpia.de email: taba@mpia.de
Eva Schinnerer
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117-Heidelberg, Germany email: taba@mpia.de email: taba@mpia.de email: taba@mpia.de email: taba@mpia.de
Eric Murphy
Affiliation:
The Observatories of the Carnegie Institution for Science, CA 911101, USA
Rainer Beck
Affiliation:
Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, 53121-Bonn, Germany
Annie Hughes
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117-Heidelberg, Germany email: taba@mpia.de email: taba@mpia.de email: taba@mpia.de email: taba@mpia.de
Brent Groves
Affiliation:
Max-Planck-Institut für Astronomie, Königstuhl 17, 69117-Heidelberg, Germany email: taba@mpia.de email: taba@mpia.de email: taba@mpia.de email: taba@mpia.de
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Abstract

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We investigate the correlation between the far-infrared (FIR) and radio continuum emission from NGC6946 on spatial scales between 0.9 and 17 kpc. We use the Herschel PACS (70, 100, 160μm) and SPIRE (250μm) data from the KINGFISH project. Separating the free-free and synchrotron components of the radio continuum emission, we find that FIR is better correlated with the free-free than the synchrotron emission. Compared to a similar study in M33 and M31, we find that the scale dependence of the synchrotron–FIR correlation in NGC6946 is more similar to M31 than M33. The scale dependence of the synchrotron–FIR correlation can be explained by the turbulent-to-ordered magnetic field ratio or, equivalently, the diffusion length of the cosmic ray electrons in these galaxies.

Keywords

Star formationISMMagnetic fieldCosmic ray electrons
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 7 , Symposium S284: The Spectral Energy Distribution of Galaxies , September 2011 , pp. 400 - 403
Copyright
Copyright © International Astronomical Union 2012

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