2021/11/30 by B. O'Connor, Brendan O’Connor, Ersin Göğüş +42
Physics and Astronomy · #Astronomy #Astrophysical Phenomena and Observations #Astrophysics #Astrophysics and Cosmic Phenomena #Infrared #Neutron star #Optics #Orbital period #Photon #Physics #Pulsar #Pulsars and Gravitational Waves Research #Stars #Telescope #X-ray #X-ray binary #X-ray pulsar #astro-ph.HE
paper · pdf · doi:10.3847/1538-4357/ac5032
Revised manuscript. Accepted to ApJ
arxiv created 2022/02/01 · openalex publication_date 2022/03/01 · arxiv updated 2022/03/14 · openalex created_date 2022/04/03 · openalex updated_date 2026/08/05
We report on observations of the candidate Be/X-ray binary IGR J18219-1347 with Swift/XRT, NuSTAR, and NICER during Type-I outbursts in March and June 2020. Our timing analysis revealed the spin period of a neutron star with P_\textrmspin=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 Γ ∼ 0.5 and cutoff energy at ∼ 13 keV.