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27 April 2024 |
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Variations of the Radio Synchrotron Spectral Index in M33 | | F. S. Tabatabaei
; R. Beck
; E. Krügel
; M. Krause
; E. M. Berkhuijsen
; K. D. Gordon
; K. M. Menten
; | | Date: |
5 Feb 2008 | | Abstract: | We determine the variation in the nonthermal radio spectral index in the
nearby spiral galaxy M33. 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 $mu$m and a standard
dust model, we de-redden the H$alpha$ emission. The extinction-corrected
H$alpha$ emission serves as a template for the thermal free-free radio
emission. Subtracting from the observed 3.6 and 20cm emission (Effelsberg and
the VLA) this free-free emission, we obtain maps of the nonthermal intensity
and spectral index. | | Source: | arXiv, 0802.0642 | | Services: | Forum | Review | PDF | Favorites | |
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