Mathematics – Logic
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999head....4.0104w&link_type=abstract
American Astronomical Society, HEAD meeting #4, #01.04; Bulletin of the American Astronomical Society, Vol. 31, p.695
Mathematics
Logic
Scientific paper
Based on an ultra deep (230 ks) ROSAT HRI imaging of M101, we have detected 5 X-ray sources that coincide spatially with optical emission line features previously classified as supernova remnants in this nearby galaxy. 2 of these coincidences (SNR MF83 and NGC5471B) most likely represent the true physical association of X-ray emission with shock-heated interstellar gas. MF83, with a radius of ~ 134 pc, is one of the largest remnants known. NGC5471B, with a radius of 30 pc and a velocity of at least 350 km s(-1) (FWZI), is extremely bright in both radio and optical. The X-ray luminosities of these two shell-like remnants are ~ 1 and 3 x 10(38) ergs s(-1) (0.5-2 keV), about an order of magnitude brighter than the brightest supernova remnants known in our Galaxy and in Magellanic Clouds. The inferred blastwave energy is ~ 5 x 10(52) ergs for NGC5471B and ~ 5 x 10(53) ergs for MF83. Therefore, the remnants likely originate in hypernovae, which are gtrsim 10(2) times more energetic than typical supernovae and are postulated as being responsible for gamma -ray bursts observed at cosmological distances. The study of such hypernova remnants in nearby galaxies have the potential to provide important constraints on the progenitor type, rate, energetics, and beaming effect of gamma -ray bursts.
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