A 0.5 Msec Glance at the Supernova Remnant G21.5-0.9 with the Chandra X-ray Observatory

Details A 0.5 Msec Glance at the Supernova Remnant G21.5-0.9 with the Chandra X-ray Observatory A 0.5 Msec Glance at the Supernova Remnant G21.5-0.9 with the Chandra X-ray Observatory

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jrasc..99s.140m&link_type=abstract

Journal of the Royal Astronomical Society of Canada, Vol. 99, No. 4, p.140

Astronomy and Astrophysics

Astronomy

Scientific paper

G21.5-0.9 is one of approximately 15 currently known Galactic filledcentre supernova remnants (plerions), the most well-known being the Crab Nebula. These filled-centre remnants lack a supernova remnant shell and typically have a larger size in radio than in X-ray. Early Chandra observations of G21.5-0.9 showed that the 40. radius plerion surrounded a 2. compact centre, and revealed a faint 150. radius X-ray halo around G21.5-0.9, making its size in X-ray larger than its radio size. The origin of the X-ray halo remains uncertain. It has been suggested that the halo could be partially due to dust scattering since G21.5-0.9 is a bright and heavily absorbed source (Safi-Harb et al. 2001). We will present an analysis of the brightest regions in the halo of G21.5-0.9 and show the results of a search for line emission using 0.5 Msec of data acquired with the Advanced CCD Imaging Spectrometer (ACIS) on the Chandra X-ray Observatory over the last six years. We will also show the deepest and highest resolution image of G21.5-0.9 to date. This deep image reveals for the first time 1) a limb-brightened morphology in the eastern section of the halo, and 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.

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