A {S}tudy of {C}omposite {S}upernova {R}emnants

Abstract

We present a study ofcomposite supernova remnants (SNRs) and the detailed description of twoof them, each one a good example of the two classes of compositeSNRs. W44 is a thermal-dominated SNR with a shell-like morphology inthe radio band and a distinctly peaked centered one in the X-ray.We have analyzed two different models to explain this particularX-ray-emission spatial distribution. In addition, we have for thefirst time detected the X-ray synchrotron nebula associated with theradio pulsar PSR B1853+01 located within the boundaries of the SNR.MSH 11-62 is a power-law-dominated remnant but no pulsar associatedwith the remnant has been detected until now. We have isolated thepoint-like source of high-energy emission coming from this SNR anddeduce from the spectral analysis some characteristics of the pulsaryet to be detected in the radio band. Both of these SNRs presentthe characteristic of the center-filled remnants in contradictionwith the standard scenarios of supernova evolution although they arevery different from each other. It is very likely that W44 gets itscentered-peaked profile from the dominating radiative losses as it isprobably entering the radiative phase of standard supernova evolution,while MSH 11-62 gets its from the yet undetected radio pulsar mostprobably present at the center of the synchrotron emission detected.In addition, we have presented data on a middle age pulsar with noremnant counterpart but for which we detect synchrotron emission inmuch the same way that the emission is detected for MSH 11-62.