Other
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006phdt........35m&link_type=abstract
Proquest Dissertations And Theses 2006. Section 0303, Part 0606 132 pages; [M.Sc. dissertation].Canada: University of Manitoba
Other
Scientific paper
The absence of a supernova remnant (SNR) shell surrounding the Crab and other plerions (pulsar wind nebulae) has been a mystery for three decades. G21.5-0.9 is a particularly intriguing SNR in which the central powering engine (PSR J1833-1034) has been recently detected. Early Chandra observations revealed a faint extended X-ray halo which was associated with the SNR shell; however its spectrum was non-thermal, unlike that expected from an SNR shell. On the other hand, a plerionic origin to the halo was problematic since the X-ray plerion would be larger than the radio plerion. This thesis presents the analysis of an integrated 278 ks of archival Chandra data acquired with the High-Resolution Camera (HRC) and 579 ks aquired with the Advanced CCD Imaging Spectrometer (ACIS). This study presents the deepest and highest resolution images of any plerionic SNR to date. The resulting images reveal for the first time: (1) a limb-brightened morphology in the eastern section of the halo, (2) a rich structure in the inner (40" radius) bright plerion including wisps and a double-lobed morphology with an axis of symmetry running in the northwest- southeast direction, and (3) the dynamic nature of the plerion with knots appearing, moving, and disappearing with time. The spatially resolved spectroscopic study indicates that the photon index steepens with increasing distance from the central point source out to a radius of 40" then becomes constant at ~2.6 in the X-ray halo (for a column density of N H = 2.33 × 10 22 atoms cm -2 ). Evidence of line emission due to Mg, Si, and S was found in the halo's northern knots, indicating that these features are shock-heated ejecta from the SN explosion. The limb lacked the evidence for heavy elements, indicating that it is the SNR, shell (shock-heated ISM). This study illustrates the need for deep Chandra observations to reveal the missing SNR material in Crab-like plerions.
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