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2013MNRAS.433.2958I - Mon. Not. R. Astron. Soc., 433, 2958-2974 (2013/August-3)
The 617MHz-λ850µm correlation (cosmic rays and cold dust) in NGC 3044 and NGC 4157.
IRWIN J.A., BRAR R.S., SAIKIA D.J. and HENRIKSEN R.N.
Abstract (from CDS):
The dust spectrum at long wavelengths required fitting with a two-temperature model for both galaxies, implying the presence of cold dust (Tc=9.5K for NGC 3044 and Tc=15.3K for NGC 4157). Dust masses are Md=1.6x108M☉ and Md=2.1x107M☉ for NGC 3044 and NGC 4157, respectively, and are dominated by the cold component.
There is a clear correlation between the 617MHz and λ850µm emission in the two galaxies. In the case of NGC 3044 for which the λ850µm data are strongly dominated by cold dust, this implies a relation between the non-thermal synchrotron emission and cold dust. The 617MHz component represents an integration of massive star formation over the past 107-8yr and the λ850µm emission represents heating from the diffuse interstellar radiation field (ISRF).
The 617MHz-λ850µm correlation improves when a smoothing kernel is applied to the λ850µm data to account for differences between the cosmic ray (CR) electron diffusion scale and the mean free path of an ISRF photon to dust. The best-fitting relation is L_617_MHz ∝ L_850µm^2.1 ± 0.2 for NGC 3044. If variations in the cold dust emissivity are dominated by variations in dust density, and the synchrotron emission depends on magnetic field strength (a function of gas density) as well as CR electron generation (a function of massive star formation rate and therefore density via the Schmidt law) then the expected correlation for NGC 3044 is L_617_MHz ∝ L_850µm^2.2, in agreement with the observed correlation.
Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)
Journal keyword(s): galaxies: individual (NGC 3044, NGC 4157) - galaxies: ISM - infrared: galaxies - radio continuum: galaxies
Simbad objects: 14
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