학술논문
Identification of an X-ray Pulsar in the BeXRB system IGR J18219$-$1347
Document Type
Working Paper
Author
O'Connor, B.; Gogus, E.; Huppenkothen, D.; Kouveliotou, C.; Gorgone, N.; Townsend, L. J.; Calamida, A.; Fruchter, A.; Buckley, D. A. H.; Baring, M. G.; Kennea, J. A.; Younes, G.; Arzoumanian, Z.; Bellm, E.; Cenko, S. B.; Gendreau, K.; Granot, J.; Hailey, C.; Harrison, F.; Hartmann, D.; Kaper, L.; Kutyrev, A.; Slane, P. O.; Stern, D.; Troja, E.; van der Horst, A. J.; Wijers, R. A. M. J.; Woudt, P.
Source
Subject
Language
Abstract
We report on observations of the candidate Be/X-ray binary IGR J18219$-$1347 with \textit{Swift}/XRT, \textit{NuSTAR}, and \textit{NICER} during Type-I outbursts in March and June 2020. Our timing analysis revealed the spin period of a neutron star with $P_\textrm{spin}=52.46$ s. This periodicity, combined with the known orbital period of $72.4$ d, indicates that the system is a BeXRB. Furthermore, by comparing the infrared counterpart's spectral energy distribution to known BeXRBs, we confirm this classification and set a distance of approximately $10-15$ kpc for the source. The source's broadband X-ray spectrum ($1.5-50$ keV) is described by an absorbed power-law with photon index $\Gamma$\,$\sim$\,$0.5$ and cutoff energy at $\sim$\,$13$ keV.
Comment: Revised manuscript. Accepted to ApJ
Comment: Revised manuscript. Accepted to ApJ