Discovery of an Exceptional Optical Nebulosity in the Suspected Galactic SN Iax Remnant Pa 30 Linked to the Historical Guest Star of 1181 CE
| Autor: | Fesen, Robert A., Schaefer, Bradley E., Patchick, Dana |
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| Rok vydání: | 2023 |
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| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/2041-8213/acbb67 |
| Popis: | 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 (I[6716/H-alpha] >5), 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. Comment: 9 pages, 5 figures; revised text plus a new figure; Accepted for publication in the ApJ Letters |
| Databáze: | arXiv |
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