Multi-frequency study of Local Group supernova remnants
نویسندگان
چکیده
منابع مشابه
Multifrequency Observations of One of the Largest Supernova Remnants in the Local Group of Galaxies, Lmc
We present the results of new Australia Telescope Compact Array (ATCA) observations of one of the largest supernova remnants, SNR J0450–709, in the Local Group of galaxies. We found that this Large Magellanic Cloud (LMC) object exhibits a typical morphology of an old supernova remnant (SNR) with diameter D=102×75±1 pc and radio spectral index α=–0.43±0.06. Regions of high polarisation were dete...
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We study in detail the effect of different particle release times from sources on the cosmic-ray (CR) spectrum below 10eV in the Galaxy. We discuss different possible forms of particle injection such as burst-like injection, continuous injection for a finite time, injection from a stationary source and energy dependent injection. When applied to the nearby known supernova remnants, we find that...
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We have used MERLIN at 408 MHz to image the central starburst region of M82 with a resolution of 0.5 arcsec. We detect 20 supernova remnants at this frequency which is a much smaller number than we detect at higher frequencies (50). We attribute this diierence to free-free absorption by ionised gas. We nd that 7 remnants show low-frequency turnovers in their spectra consistent with free-free ab...
متن کاملEffect of nearby supernova remnants to the local Cosmic-Rays
The effect of different particle release time from the sources to the cosmic-ray (CR) spectrum below 10eV in the Galaxy are studied in detail. We discuss different possible forms of particle injection like the burst-like injection, continuous injection for a finite time, injection from a stationary source and energy dependent injection. When applied to the nearby known supernova remnants, it is...
متن کاملShell-type Supernova Remnants
The role of Supernova Remnants (SNRs) for the production of the Galactic Cosmic Rays is reviewed from the point of view of theory and very high energy gamma-ray experiments. The point is made that theory can describe young SNRs very well, if the evidence from the synchrotron emission is used to empirically determine several parameters of the theory, and thus theory can predict the relative cont...
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ژورنال
عنوان ژورنال: Astronomy and Astrophysics
سال: 2010
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201014767