SXP 1323 is a peculiar high-mass X-ray binary located in the Small Magellanic Cloud, renowned for its rapid spin-up. We investigate for the first time broadband X-ray properties of SXP1323, as observed by the Mikhail Pavlinsky ART-XC and eRosita telescopes on board the SRG observatory. Using ART-XC and eRosita, data we produced first broadband 1-20 keV X-ray spectrum and estimated pulsed fraction above 8 keV. With the addition of archival XMM-Newton observations we traced evolution of the SXP 1323 spin period over the last five years and found that after 2016 the source switched to a linear spin-up with rate of -29.9 s yr−1. Broadband X-ray spectrum is typical for accreting X-ray pulsars, with steep powerlaw index (Γ=-0.15) and exponential cutoff energy of 5.1 keV. No significant difference between spectra obtained in states with and without pulsations were found.
@article{arxiv.2107.05589,
title = {Losing a minute every two years: SRG X-ray view on the rapidly accelerating X-ray pulsar SXP1323},
author = {I. A. Mereminskiy and A. A. Mushtukov and A. A. Lutovinov and S. S. Tsygankov and A. N. Semena and S. V. Molkov and A. E. Shtykovsky},
journal= {arXiv preprint arXiv:2107.05589},
year = {2022}
}
Comments
Submitted to A&A for the Special Issue: The Early Data Release of eROSITA and Mikhail Pavlinsky ART-XC on the SRG Mission. 5 pages, 3 figures