Planck intermediate results: XXXI. Microwave survey of Galactic supernova remnants
Loading...
Access rights
openAccess
publishedVersion
URL
Journal Title
Journal ISSN
Volume Title
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This publication is imported from Aalto University research portal.
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
View publication in the Research portal (opens in new window)
View/Open full text file from the Research portal (opens in new window)
Other link related to publication (opens in new window)
Authors
Date
2016-02-01
Major/Subject
Mcode
Degree programme
Language
en
Pages
21
Series
Astronomy and Astrophysics, Volume 586, pp. 1-21
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, 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.Description
Keywords
cosmic rays, ISM: supernova remnants, radio continuum: ISM
Other note
Citation
Planck Collaboration 2016, ' Planck intermediate results : XXXI. Microwave survey of Galactic supernova remnants ', Astronomy and Astrophysics, vol. 586, A134, pp. 1-21 . https://doi.org/10.1051/0004-6361/201425022