Physics
Scientific paper
Jul 1972
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1972natur.238..144s&link_type=abstract
Nature, Volume 238, Issue 5360, pp. 144 (1972).
Physics
2
Scientific paper
OF the five X-ray sources which are identified with remnants of supernovae, the Tycho 1572 source is of particular interest. In this case the X-ray emission cannot be considered as the continuation of the synchrotron radio spectrum because it can easily be shown that, independent of the mechanism of injection, the spectrum must be ``bent'' in the frequency region ν<1013 Hz. Also, it cannot be assumed that the observed X-radiation is thermal and caused by hot plasma behind the front of shock-wave produced by the expanding envelope of a remnant. This mechanism qualitatively explains X-radiation from Cassiopeia A if the undisturbed density n0 of interstellar matter in the vicinity of the explosion is about 30 cm-3. This value of n0 is in excellent agreement with the density of the HII region which is observed around Cas A (ref. 1). But in the case of the Tycho remnant one must assume that n0 ~5 cm-3 if the radiation is thermal. Such a value of n0 contradicts the observed large dimensions of this remnant, which, according to all indications, has exploded in a relatively rare medium between the clouds of interstellar matter, where n0<=0.1 cm-3. This excludes the possibility of explaining X-radiation from Tycho as thermal radiation from hot plasma.
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