Other
Scientific paper
Oct 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997phdt.........5h&link_type=abstract
Thesis (PHD). COLUMBIA UNIVERSITY , Source DAI-B 58/04, p. 1924, Oct 1997, 215 pages.
Other
Synchrotron Nebula, Pulsar
Scientific paper
We present a study of composite supernova remnants (SNRs) and the detailed description of two of them, each one a good example of the two classes of composite SNRs. W44 is a thermal-dominated SNR with a shell-like morphology in the radio band and a distinctly peaked centered one in the X-ray. We have analyzed two different models to explain this particular X-ray-emission spatial distribution. In addition, we have for the first time detected the X-ray synchrotron nebula associated with the radio pulsar PSR B1853+01 located within the boundaries of the SNR. MSH 11-62 is a power-law-dominated remnant but no pulsar associated with the remnant has been detected until now. We have isolated the point-like source of high-energy emission coming from this SNR and deduce from the spectral analysis some characteristics of the pulsar yet to be detected in the radio band. Both of these SNRs present the characteristic of the center-filled remnants in contradiction with the standard scenarios of supernova evolution although they are very different from each other. It is very likely that W44 gets its centered-peaked profile from the dominating radiative losses as it is probably entering the radiative phase of standard supernova evolution, while MSH 11-62 gets its from the yet undetected radio pulsar most probably present at the center of the synchrotron emission detected. In addition, we have presented data on a middle age pulsar with no remnant counterpart but for which we detect synchrotron emission in much the same way that the emission is detected for MSH 11-62.
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