Dense Iron-predominant Ejecta and Core-collapse Supernova Explosion in the Young Supernova Remnant G11.2-0.3

Details Dense Iron-predominant Ejecta and Core-collapse Supernova Explosion in the Young Supernova Remnant G11.2-0.3 Dense Iron-predominant Ejecta and Core-collapse Supernova Explosion in the Young Supernova Remnant G11.2-0.3

May 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21431606m&link_type=abstract

American Astronomical Society, AAS Meeting #214, #316.06; Bulletin of the American Astronomical Society, Vol. 41, p.762

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Scientific paper

We present the results of near-infrared spectroscopic observations of dense ( 103 cm-3) iron ejecta in the young core-collapse supernova remnant G11.2-0.3. Five ejecta knots projected to be close to its center show a large dispersion in their Doppler shifts: two knots in the east are blueshifted by more than 1,000 km s-1, while three western knots have blueshifts of 20-60 km s-1. One ejecta filament in the northwestern boundary, on the other hand, is redshifted by ≥ 200 km s-1, while another filament in the southeastern boundary shows a negligible radial motion. Some of the knots and filaments have secondary velocity components, deviating from a simple velocity structure. The Doppler shifts of the ejecta knots are suggestive of a systematic velocity shift of -500 km s-1 among the central ejecta knots moving in the opposite directions between the east and west, which also provides a plausible explanation of the velocity structures of some of the ejecta knots and filaments if they have been excited by the reverse shocks of the supernova remnant. The ejecta appear to be Fe-predominant, devoid of other elements, which may attest to the α-rich freezeout process in the explosive nucleosynthesis of the core-collapse supernova explosion close to the core. This is the first identification of such Fe-predominant dense ejecta in supernova remnants. The prominent bipolar distribution of the Fe ejecta in the northwestern and southeastern direction advocates that the supernova exploded primarily along this direction. The Fe ejecta knots scattered across the supernova remnant might have been seeded by a hot Ni bubble created after the supernova explosion.

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