Large Ejecta Fragments in Evolved SNRs

Details Large Ejecta Fragments in Evolved SNRs Large Ejecta Fragments in Evolved SNRs

Feb 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sgrb.confe..50p&link_type=abstract

Presented at the KITP Conference: Supernova and Gamma-Ray Burst Remnants, Feb 10, 2006, Kavli Institute for Theoretical Physics,

Physics

Scientific paper

Standard models of SNR evolution indicate that after the shock has swept-up an amount of mass significantly larger the SN ejecta, the ejecta should be well-mixed with the swept-up ISM and difficult to observe. Aschenbachet.al. (1995) suggested that the "bullet-like" features seen near the outer rim of the Vela SNR are large fragments of ejecta which have recently caught up to and passed through the shock. Follow-up observations on the Vela fragments A (Miyata et.al. 2001) and D (Plucinsky et.al. 2001 and Katsuda et.al. 2005) indicated significantly enhanced abundances consistent with the ejecta hypothesis. It is somewhat surprising to find such large fragments of ejecta in a SNR which is approximately 18,000 yrold. Simulations by Wang and Chevalier (2002) indicate that such fragment scan only survive if they are rather massive and have a density contrast which is 1000 times that of the ambient medium. We will review the properties of the apparent fragments in Vela and review the possible existence of such fragments in other SNRs.

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