Radio to infrared spectra of late-type galaxies with Planck and Wilkinson Microwave Anisotropy Probe data
作者： Rodney Davies , M. W. Peel , R. J. Beswick , C. Dickinson , D. L. Clements
DOI: 10.1111/J.1745-3933.2011.01108.X
关键词:
摘要: We use the Planck Early Release Compact Source Catalogue combined with Wilkinson Microwave Anisotropy Probe (WMAP) and other archival measurements to construct continuum spectra of three nearby dusty star-forming galaxies: Messier 82, NGC 253 4945. carry out a least-squares fit using combination simple synchrotron, free-free thermal dust models, look for evidence anomalous microwave emission (AME). find that radio all galaxies are consistent steep spectrum synchrotron emission, significant amount required explain WMAP data points in frequency range 30-150 GHz. This brings star formation rate based on into better agreement from non-thermal emission. place limits presence AME these galaxies, finding it is lower than expectations ratio far-infrared Galaxy. Nevertheless, shape 4945 hints at peak around 30 Future will let us more closely as well extend analysis many galaxies.
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