Swift, NuSTAR, and INTEGRAL observations of the symbiotic X-ray binary IGR J16194-2810

Article Article scientifique Article Swift, NuSTAR, and INTEGRAL observations of the symbiotic X-ray binary IGR J16194-2810 eng 2023-11-14 2024-01-09 author Bozzo Enrico 0000-0002-8201-1525 698333 Département d'astronomie (ASTRO) author Romano Patrizia 0000-0003-0258-7469 author Ferrigno Carlo 0000-0003-1429-1059 680316 Département d'astronomie (ASTRO) author Ducci Lorenzo 0000-0002-9989-538X 823036 3585-3591 10.1093/mnras/stad3509 0035-8711 https://academic.oup.com/mnras/article/527/2/3585/7420522 We report on a simultaneous observational campaign with both Swift/XRT and NuSTAR targeting the symbiotic X-ray binary (SyXB) IGR J16194-2810. The main goal of the campaign was to investigate the possible presence of cyclotron scattering absorption features in the broad-band spectrum of the source, and help advance our understanding of the process of neutron star formation via the accretion-induced collapse of a white dwarf. The 1–30 keV spectrum of the source, as measured during our campaign, did not reveal the presence of any statistically significant absorption feature. The spectrum could be well described using a model comprising a thermal black-body hot component, most likely emerging from the surface of the accreting neutron star, and a power law with no measurable cut-off energy (and affected by a modest absorption column density). Compared to previous analyses in the literature, we could rule out the presence of a colder thermal component emerging from an accretion disc, compatible with the idea that IGR J16194-2810 is a wind-fed binary (as most of the SyXBs). Our results were strengthened by exploiting the archival XRT and INTEGRAL data, extending the validity of the spectral model used up to 0.3–40 keV and demonstrating that IGR J16194-2810 is unlikely to undergo significant spectral variability over time in the X-ray domain. X-rays: binaries Stars: individual: IGR J16194-2810 Dewey 520 26 Département d'astronomie 12 false Monthly notices of the Royal Astronomical Society 527 2 4f402444-2148-4e84-b4a4-49161d2e5181 Article (Published version) Public stad3509.pdf 585857 application/pdf CC BY-4.0 a74eba518fddce35e5c9b3be46d863fa0bd8a6f90fb38b8974029513afe57d97 openAccess Faculté des sciences / Département d'astronomie

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Swift, NuSTAR, and INTEGRAL observations of the symbiotic X-ray binary IGR J16194-2810	Monthly notices of the Royal Astronomical Society			2024	46	186

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Ducci, Lorenzo