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Fast Blast Wave and Ejecta in the Young Core-Collapse Supernova Remnant MSH 15-52/RCW 89 | | Kazimierz J. Borkowski
; Stephen P. Reynolds
; William Miltich
; | | Date: |
15 May 2020 | | Abstract: | One of the youngest known remnants of a core-collapse supernova (SN) in our
Galaxy is G320.4$-$1.2/MSH 15-52, containing an energetic pulsar with a very
short (1700 yr) spindown age, and likely produced by a stripped-envelope SN
Ibc. Bright X-ray and radio emission north of the pulsar overlaps with an
H$alpha$ nebula RCW 89. The bright X-rays there have a highly unusual and
quite puzzling morphology, consisting of both very compact thermally-emitting
knots and much more diffuse emission of nonthermal origin. We report new X-ray
observations of RCW 89 in 2017 and 2018 with Chandra that allowed us to measure
the motions of many knots and filaments on decade-long time baselines. We
identify a fast blast wave with a velocity of $(4000 pm 500)d_{5.2}$ km/s
($d_{5.2}$ is the distance in units of 5.2 kpc) with a purely nonthermal
spectrum, and without any radio counterpart. Many compact X-ray emission knots
are moving vary fast, with velocities as high as 5000 km/s, predominantly
radially away from the pulsar. Their spectra show that they are Ne- and Mg-rich
heavy-element SN ejecta. They have been significantly decelerated upon their
recent impact with the dense ambient medium north of the pulsar. We see fast
evolution in brightness and morphology of knots in just a few years. Ejecta
knots in RCW 89 resemble those seen in Cas A at optical wavelengths in terms of
their initial velocities and densities. They might have the same origin, still
not understood but presumably related to stripped-envelope SN explosions
themselves. | | Source: | arXiv, 2005.7721 | | Services: | Forum | Review | PDF | Favorites | |
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