http://arxiv.org/abs/2301.04809
A newly recognized young Galactic SN remnant, Pa 30 (G123.1+4.6), centered on a hot central star with a ~16,000 km/s wind velocity has recently been proposed to be the result of a double-degenerate merger leading to a SN Iax event associated with the guest star of 1181 CE. Here we present deep optical [S II] 6716,6731 images of Pa 30 which reveal an extraordinary and highly structured nebula 170″ in diameter with dozens of long (5″ – 20″) radially aligned filaments with a convergence point near the hot central star. Optical spectra of filaments indicate a peak expansion velocity ~1100 km/s with electron densities of 100 to 700 cm^-3, and a thick shell-like structure resembling its appearance in 22 micron WISE images. No H-alpha emission was seen (6716/H-alpha >8), with the only other line emission detected being faint [Ar III] 7136 suggesting a S, Ar-rich but H-poor remnant. The nebula’s angular size, estimated 2.3 kpc distance, and 1100 km/s expansion velocity are consistent with an explosion date around 1181 CE. The remnant’s unusual appearance may be due to the photoionization of wind-driven ejecta due to clump-wind interactions caused by the central star’s high-luminosity wind.
R. Fesen, B. Schaefer and D. Patchick
Fri, 13 Jan 23
71/72
Comments: 8 pages, 4 figures
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