# Planck intermediate results. XXXI. Microwave survey of Galactic supernova remnants

Abstract : The all-sky Planck survey in 9 frequency bands was used to search for emission from all 274 known Galactic supernova remnants. Of these, 17 were detected in at least two Planck frequencies. The radio-through-microwave spectral energy distributions were compiled to determine the emission mechanism for microwave emission. In only one case, IC 443, is the high-frequency emission clearly from dust associated with the supernova remnant. In all cases, the low-frequency emission is from synchrotron radiation. A single power law, as predicted for a population of relativistic particles with energy distribution that extends continuously to high energies, is evident for many sources, including the Crab and PKS 1209-51/52. A decrease in flux density relative to the extrapolation of radio emission is evident in several sources. Their spectral energy distributions can be approximated as broken power laws, $S_\nu\propto\nu^{-\alpha}$, with the spectral index, $\alpha$, with the spectral index, alpha, increasing by 0.5 to 1 above a break frequency in the range 10 to 60 GHz. The break could be due to synchrotron losses.
Type de document :
Article dans une revue
Astronomy and Astrophysics - A&A, EDP Sciences, 2016, 586, pp.A134. 〈10.1051/0004-6361/201425022〉

http://hal.in2p3.fr/in2p3-01217094
Contributeur : Emmanuelle Vernay <>
Soumis le : lundi 19 octobre 2015 - 09:17:59
Dernière modification le : lundi 9 avril 2018 - 12:22:07

### Citation

M. Arnaud, M. Ashdown, F. Atrio-Barandela, J. Aumont, C. Baccigalupi, et al.. Planck intermediate results. XXXI. Microwave survey of Galactic supernova remnants. Astronomy and Astrophysics - A&A, EDP Sciences, 2016, 586, pp.A134. 〈10.1051/0004-6361/201425022〉. 〈in2p3-01217094〉

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