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arXiv · 1012.5703

SNR 0104-72.3: A remnant of Type Ia Supernova in a Star-forming region?

Jae-Joon Lee·Sangwook Park·John Patrick Hughes·Patrick O. Slane·David N. Burrows
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Abstract

We report our 110 ks Chandra observations of the supernova remnant (SNR) 0104-72.3 in the Small Magellanic Cloud (SMC). The X-ray morphology shows two prominent lobes along the northwest-southeast direction and a soft faint arc in the east. Previous low resolution X-ray images attributed the unresolved emission from the southeastern lobe to a Be/X-ray star. Our high resolution Chandra data clearly shows that this emission is diffuse, shock-heated plasma, with negligible X-ray emission from the Be star. The eastern arc is positionally coincident with a filament seen in optical and infrared observations. Its X-ray spectrum is well fit by plasma of normal SMC abundances, suggesting that it is from shocked ambient gas. The X-ray spectra of the lobes show overabundant Fe, which is interpreted as emission from the reverse-shocked Fe-rich ejecta. The overall spectral characteristics of the lobes and the arc are similar to those of Type Ia SNRs, and we propose that SNR 0104-72.3 is the first case for a robust candidate Type Ia SNR in the SMC. On the other hand, the remnant appears to be interacting with dense clouds toward the east and to be associated with a nearby star-forming region. These features are unusual for a standard Type Ia SNR. Our results suggest an intriguing possibility that the progenitor of SNR 0104-72.3 might have been a white dwarf of a relatively young population.

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Jae-Joon Lee, Sangwook Park, John Patrick Hughes, Patrick O. Slane, David N. Burrows. 2011-02-03. SNR 0104-72.3: A remnant of Type Ia Supernova in a Star-forming region?. https://doi.org/10.1088/2041-8205%2F731%2F1%2Fl8

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