A Possible Discovery of the Optical Counterpart of the X-ray source NuSTAR J053449+2126.0

E. N. Ercan; E. Aktekin Çalışkan; M. H. Erkut; A. Farhan; E. P. J. van den Heuvel

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arXiv · 2302.08994

A Possible Discovery of the Optical Counterpart of the X-ray source NuSTAR J053449+2126.0

E. N. Ercan·E. Aktekin Çalışkan·M. H. Erkut·A. Farhan·E. P. J. van den Heuvel

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Abstract

We report the observation of a possible optical counterpart to the recently discovered X-ray source NuSTAR J053449+2126.0 (J0534 in short). We observed the source location using the 1.5-m Telescope (RTT150) to search for an optical counterpart, and detected a possible optical counterpart and analysed its spectrum using the $B$, $V$, $R$, and $I$ images of J0534, and found that the possible optical counterpart of J0534 is likely to be a long-known optical source, namely PSO J083.7063+21.4333. However, this source has been misclassified as a star rather than being an extragalactic source. We determined the source distance accurately for the first time based on our spectral analysis. J0534 could be a high-redshift ($z\simeq2.2$) member of an Active Galactic Nucleus (AGN) sub-group identified as quasars. Our analysis favours an accreting black hole of mass $\sim 7\times 10^8 M_{\odot}$ as a power supply for the quasar. Further observations in optical and other wavelengths are needed to confirm its precise nature.

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E. N. Ercan, E. Aktekin Çalışkan, M. H. Erkut, A. Farhan, E. P. J. van den Heuvel. 2023-02-17. A Possible Discovery of the Optical Counterpart of the X-ray source NuSTAR J053449+2126.0. https://arxiv.org/abs/2302.08994

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