Using Optical and Mid-Infrared Spectroscopy to Trace the Kinematics and Composition of Ejecta in the Galactic Supernova Remnant G292.0+1.8

Details Using Optical and Mid-Infrared Spectroscopy to Trace the Kinematics and Composition of Ejecta in the Galactic Supernova Remnant G292.0+1.8 Using Optical and Mid-Infrared Spectroscopy to Trace the Kinematics and Composition of Ejecta in the Galactic Supernova Remnant G292.0+1.8

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...208.6104g&link_type=abstract

American Astronomical Society Meeting 208, #61.04; Bulletin of the American Astronomical Society, Vol. 38, p.141

Astronomy and Astrophysics

Astronomy

Scientific paper

Of the known Galactic core collapse SNRs, G292.0+1.8 is the only object exhibiting all the expected characteristics of a core-collapse SN: X-ray and optical emission from metal-rich ejecta, a recently discovered active pulsar and pulsar wind nebula, and evidence for equatorially distributed circumstellar material. This makes G292.0+1.8 a very important benchmark for studying all aspects of supernova explosions, from heavy element nucleosynthesis to the formation of neutron stars. I will present results of an optical kinematic study of this 'older cousin' of Cas A, showing that the optical emission in G292.0+1.8 can be divided into three distinct components: (1) Stationary circumstellar wind material seen in Halpha, [O III] and X-rays, (2) mostly blueshifted, fast-moving knots (FMKs similar to Cas A) kinematically distributed like an expanding shell, and (3) a large spur of mostly redshifted ejecta distorted by Rayleigh-Taylor instabilities. I will also describe results of our recent IRS spectroscopy of the spur, highlighting the importance of mid-IR emission lines as probes of both the temperature and chemical composition of the radiatively shocked ejecta. The IRS spectra indicate that unlike Cas A, the radiatively shocked ejecta in G292.0+1.8 consist mostly of hydrostatic burning products from the massive stellar progenitor.

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