Investigating the Ultra-Compact X-ray Binary Candidate SLX 1735-269 with NICER and NuSTAR
arxiv(2024)
摘要
We present two simultaneous NICER and NuSTAR observations of the
ultra-compact X-ray binary (UCXB) candidate SLX 1735-269. Using various
reflection modeling techniques, we find that XILLVERCO, a model used for
fitting X-ray spectra of UCXBs with high carbon and oxygen abundances is an
improvement over RELXILL or RELXILLNS, which instead contains solar-like
chemical abundances. This provides indirect evidence in support of the source
being ultra-compact. We also use this reflection model to get a preliminary
measurement of the inclination of the system, i = 57^+23_-6 degrees. This
is consistent with our timing analysis, where a lack of eclipses indicates an
inclination lower than 80 degrees. The timing analysis is otherwise
inconclusive, and we can not confidently measure the orbital period of the
system.
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