Refereed journal article or data article (A1)

Broad-band analysis of X-ray pulsar 2S 1845–024

List of AuthorsNabizadeh Armin, Tsygankov Sergey S., Molkov Sergey V., Karasev Dmitri I., Ji Long, Lutovinov Alexander A., Poutanen Juri

PublisherEDP Sciences

Publication year2022

JournalAstronomy and Astrophysics

Volume number657




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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. = −225'25".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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Last updated on 2022-31-03 at 07:59