G 292.0 + 1.8 - Evidence for a pseudo-Crab stage in SNR evolution

Astronomy and Astrophysics – Astronomy

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Cosmic Dust, Radio Sources (Astronomy), Stellar Evolution, Supernova Remnants, Astronomical Maps, Brightness Distribution, Crab Nebula, Ejecta, Southern Sky

Scientific paper

New observations of the young type II supernova remnant (SNR) G 292.0+1.8 have been made at 843 MHz with 0arcmin.8 resolution using the Molonglo Observatory Synthesis Telescope and at 12, 25, 60, and 100 μm with IRAS. All of the available structural and kinematic data suggests that the southwest portion of the SNR is encountering the periphery of a cloud (where n = 0.4 cm-3) while the northeast portion is expanding into low density intercloud gas (n < 0.003 cm-3). A relatively small mass (<1 M_sun;) of high velocity ejecta seems responsible for the blast wave. A significant mass of slower ejecta is now encountering the reverse shock in the southwest, giving rise to a center-filled morphology. Such a pseudo-Crab phase may be a common occurrence in type II SNR of intermediate age.

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