Soft X-ray emission lines in the X-ray binary Swift J1858.6-0814 observed with XMM-Newton Reflection Grating Spectrometer
| Autor: | N. Castro Segura, D. J. K. Buisson, Nathalie Degenaar, M. Ozbey Arabaci, Diego Altamirano, T. Muñoz-Darias, J. van den Eijnden, F. M. Vincentelli, Poshak Gandhi, Christian Knigge, Mariano Mendez, M. Armas Padilla, M. Diaz Trigo, F. A. Fogantini |
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| Přispěvatelé: | Astronomy, High Energy Astrophys. & Astropart. Phys (API, FNWI) |
| Jazyk: | angličtina |
| Rok vydání: | 2020 |
| Předmět: |
Physics
Active galactic nucleus Astrophysics::High Energy Astrophysical Phenomena black hole physics X-ray binary Astronomy and Astrophysics Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics Corona accretion discs Redshift Neutron star X-rays: binaries stars: neutron accretion Space and Planetary Science Ionization Astrophysics::Solar and Stellar Astrophysics Emission spectrum Astrophysics::Galaxy Astrophysics Line (formation) |
| Zdroj: | Monthly Notices of the Royal Astronomical Society, 498(1), 68-76. Oxford University Press |
| ISSN: | 0035-8711 |
| Popis: | We find soft X-ray emission lines from the X-ray binary Swift J1858.6–0814 in data from XMM–NewtonReflection Grating Spectrometer (RGS): N VII, O VII, and O VIII, as well as notable residuals short of a detection at Ne IX and other higher ionization transitions. These could be associated with the disc atmosphere, as in accretion disc corona sources, or with a wind, as has been detected in Swift J1858.6–0814 in emission lines at optical wavelengths. Indeed, the N VII line is redshifted, consistent with being the emitting component of a P-Cygni profile. We find that the emitting plasma has an ionization parameter log (ξ) = 1.35 ± 0.2 and a density n > 1.5 × 1011 cm−3. From this, we infer that the emitting plasma must be within 1013 cm of the ionizing source, ∼5 × 107 rg for a 1.4 M⊙ neutron star, and from the line width that it is at least 104 rg away [2 × 109(M/1.4 M⊙) cm]. We compare this with known classes of emission-line regions in other X-ray binaries and active galactic nuclei. |
| Databáze: | OpenAIRE |
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