A1 Vertaisarvioitu alkuperäisartikkeli tieteellisessä lehdessä
Broad-band analysis of X-ray pulsar 2S 1845–024
Tekijät: Nabizadeh Armin, Tsygankov Sergey S., Molkov Sergey V., Karasev Dmitri I., Ji Long, Lutovinov Alexander A., Poutanen Juri
Kustantaja: EDP Sciences
Julkaisuvuosi: 2022
Journal: Astronomy and Astrophysics
Artikkelin numero: A58
Vuosikerta: 657
eISSN: 1432-0746
DOI: https://doi.org/10.1051/0004-6361/202141608
Verkko-osoite: https://www.aanda.org/articles/aa/abs/2022/01/aa41608-21/aa41608-21.html
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/68828118
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.
Ladattava julkaisu This is an electronic reprint of the original article. |