The Enigmatic Central Object of the RCW 103 Supernova Remnant

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Hst Proposal Id #9467

Scientific paper

X-ray observations of the young {2, 000 yrs} supernova remnant RCW 103 have revealed an enigmatic central object, originally claimed to be an isolated neutron star. However, long-term variability and 6-hr periodicity hint that this may be an accreting neutron star or a black hole, perhaps in a low-mass X-ray binary. Previous optical observations with 4-m class telescopes failed to find an optical counterpart {R > 24, V > 25.5}. Recent near-IR observations with the CTIO/OSIRIS and VLT-UT1/ISAAC revealed four objects within about 2'' radius circle around the X-ray position. One of these objects - which is 0arcs6 from the X-ray source position - is a plausible candidate for the IR counterpart of the X-ray source. To verify this hypothesis and understand the nature of the X-ray source, we propose deep imaging with NICMOS. An IR counterpart, variable at the X-ray period, and with brightness and broad-band spectrum consistent with a stellar object, would identify the source as an accreting binary with a subluminous companion. This would be the first discovery of a binary system inside a young SNR. Alternatively, a faint counterpart with a peculiar spectrum would indicate the presence of a long-hypothesized residual disk leftover after the supernova explosion.

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