Cas A's Older, Bigger Cousin: G292.0+1.8

Details Cas A's Older, Bigger Cousin: G292.0+1.8 Cas A's Older, Bigger Cousin: G292.0+1.8

Feb 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007noao.prop..296w&link_type=abstract

NOAO Proposal ID #2007A-0296

Computer Science

Scientific paper

There are only two ejecta-dominated (O-rich) supernova remnants (SNRs) in the Galaxy: Cas A and G292.0+1.8. Cas A, prototype of this class, has been well studied at all wavelengths. G292.0, which may well be a more typical remnant of a core-collapse supernova, has been relatively neglected until recently. We are working to redress this imbalance through a multi-pronged effort using ground- and space-based observatories. Here we propose to use the SOAR Optical Imager for narrow-band emission-line imagery to provide a detailed, comprehensive inventory of the SNR's filaments and their morphology. In our earlier imaging studies using the CTIO 0.9m we have identified many O III- emitting filaments whose geometries suggest Rayleigh-Taylor instabilities, perhaps tracing back to the supernova itself. We have also discovered a few filaments with S II emission (and, like the oxygen filaments, no H)-the first evidence for oxygen-burning products in G292's undiluted ejecta. We plan to use the SOAR images, which should have higher resolution and go significantly deeper than ones from the 0.9m, to probe the full extent of filaments of both types. This proposal was approved last year, but problems with the SOAR mirror supports prevented its execution-hence this resubmission.

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