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Title:
Variations of the Radio Synchrotron Spectral Index in M 33
Authors:
Tabatabaei, F. S.; Beck, R.; Krügel, E.; Krause, M.; Berkhuijsen, E. M.; Gordon, K. D.; Menten, K. M.
Publication:
Formation and Evolution of Galaxy Disks ASP Conference Series, Vol. 396, Proceedings of the conference held 1-5 October, 2007 at the Centro Convegni Matteo Ricci, Rome, Italy. Edited by José G. Funes, S.J., and Enrico Maria Corsini. San Francisco: Astronomical Society of the Pacific, 2008., p.87
Publication Date:
10/2008
Origin:
ASPC
Bibliographic Code:
2008ASPC..396...87T

Abstract

We determine the variation in the nonthermal radio spectral index in the nearby spiral galaxy M 33. We separate the thermal and nonthermal components of the radio continuum emission without the assumption of a constant nonthermal spectral index. Using the Spitzer FIR data at 70 and 160 μm and a standard dust model, we de-redden the Hα emission. The extinction-corrected Hα emission serves as a template for the thermal free-free radio emission. Subtracting from the observed 3.6 and 20 cm emission (Effelsberg and the VLA) this free-free emission, we obtain maps of the nonthermal intensity and spectral index.
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