TY - JOUR
T1 - Planck intermediate results. XXXI. Microwave survey of Galactic supernova remnants
AU - Arnaud, M.
AU - Ashdown, M.
AU - Atrio-Barandela, F-
AU - Aumont, J.
AU - Baccigalupi, C.
AU - Banday, A.J.
AU - Barreiro, R.B.
AU - Battaner, E.
AU - Benabed, K.
AU - Benoit, Lévy
AU - Bernard, J.-P
AU - Christensen, Per Rex
AU - Nasselski, Pavel
AU - Novikov, Igor Dmitrievich
PY - 2016/2/1
Y1 - 2016/2/1
N2 - 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.
AB - 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.
U2 - 10.1051/0004-6361/201425022
DO - 10.1051/0004-6361/201425022
M3 - Journal article
SN - 0004-6361
VL - 586
JO - Astronomy & Astrophysics
JF - Astronomy & Astrophysics
M1 - A134
ER -