Refereed journal article or data article (A1)
Broad-band analysis of X-ray pulsar 2S 1845–024
List of Authors: Nabizadeh Armin, Tsygankov Sergey S., Molkov Sergey V., Karasev Dmitri I., Ji Long, Lutovinov Alexander A., Poutanen Juri
Publisher: EDP Sciences
Publication year: 2022
Journal: Astronomy and Astrophysics
Volume number: 657
eISSN: 1432-0746
DOI: http://dx.doi.org/10.1051/0004-6361/202141608
URL: https://www.aanda.org/articles/aa/abs/2022/01/aa41608-21/aa41608-21.html
Self-archived copy’s web address: https://arxiv.org/abs/2110.06642
We present the results of a detailed investigation of the poorly studied X-ray pulsar 2S 1845−024 based on data obtained at the NuSTAR observatory during the type I outburst in 2017. Neither pulse phase-averaged nor phase-resolved spectra of the source show evidence for a cyclotron absorption feature. We also used data obtained from other X-ray observatories (Swift, XMM-Newton and Chandra) to study the spectral properties as a function of orbital phase. The analysis reveals a high hydrogen column density for the source reaching ∼1024 cm−2 around periastron. Using high-quality Chandra data we were able to obtain an accurate localization of 2S 1845−024 at 18h48m16s.8 and Dec. = −2◦25'25".1 (J2000), which allowed us to use infrared (IR) data to roughly classify the optical counterpart of the source as an OB supergiant at a distance of ≳15 kpc.
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