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Title

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

AuthorsBarreiro, R. Belén ; Curto, Andrés ; Diego, José María ; González-Nuevo, J. ; Herranz, D. ; López-Caniego, M. ; Macías-Pérez, J. F.; Martínez-González, Enrique ; Toffolatti, L. ; Vielva, P. ; Reach, W. T.; Planck Collaboration
KeywordsISM: supernova remnants
Cosmic rays
Radio continuum: ISM
Issue Date2016
PublisherEDP Sciences
CitationAstronomy and Astrophysics 586: A134 (2016)
AbstractThe all-sky Planck survey in 9 frequency bands was used to search for emission from all 274 known Galactic supernova remnants. Of these, 16 were detected in at least two Planck frequencies. The radio-through-microwave spectral energy distributions were compiled to determine the mechanism for microwave emission. In only one case, IC 443, is there high-frequency emission clearly from dust associated with the supernova remnant. In all cases, the low-frequency emission is from synchrotron radiation. As predicted for a population of relativistic particles with energy distribution that extends continuously to high energies, a single power law 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, Sν ∝ ν−α, with the spectral index, α, increasing by 0.5–1 above a break frequency in the range 10–60 GHz. The break could be due to synchrotron losses.
DescriptionInterstellar and circumstellar matter.-- et al.
Publisher version (URL)http://dx.doi.org/10.1051/0004-6361/201425022
URIhttp://hdl.handle.net/10261/140623
DOI10.1051/0004-6361/201425022
Identifiersdoi: 10.1051/0004-6361/201425022
e-issn: 1432-0746
issn: 0004-6361
Appears in Collections:(IFCA) Artículos
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