A persistent ultraviolet outflow from an accreting neutron star binary transient.

Autor: Castro Segura N; Department of Physics & Astronomy, University of Southampton, Southampton, UK. N.Castro-Segura@soton.ac.uk., Knigge C; Department of Physics & Astronomy, University of Southampton, Southampton, UK., Long KS; Space Telescope Science Institute, Baltimore, MD, USA.; Eureka Scientific, Inc., Oakland, CA, USA., Altamirano D; Department of Physics & Astronomy, University of Southampton, Southampton, UK., Armas Padilla M; Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain.; Departamento de Astrofísica, Universidad de La Laguna, La Laguna, Tenerife, Spain., Bailyn C; Department of Astronomy, Yale University, New Haven, CT, USA., Buckley DAH; South African Astronomical Observatory, Cape Town, South Africa., Buisson DJK; Department of Physics & Astronomy, University of Southampton, Southampton, UK., Casares J; Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain.; Departamento de Astrofísica, Universidad de La Laguna, La Laguna, Tenerife, Spain., Charles P; Department of Physics & Astronomy, University of Southampton, Southampton, UK., Combi JA; Instituto Argentino de Radioastronoma (CONICET; CICPBA; UNLP), Villa Elisa, Argentina., Cúneo VA; Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain.; Departamento de Astrofísica, Universidad de La Laguna, La Laguna, Tenerife, Spain., Degenaar ND; Anton Pannekoek Institute for Astronomy, University of Amsterdam, Amsterdam, The Netherlands., Del Palacio S; Instituto Argentino de Radioastronoma (CONICET; CICPBA; UNLP), Villa Elisa, Argentina., Díaz Trigo M; ESO, Garching bei München, Germany., Fender R; Astrophysics, Department of Physics, University of Oxford, Oxford, UK., Gandhi P; Department of Physics & Astronomy, University of Southampton, Southampton, UK., Georganti M; Department of Physics & Astronomy, University of Southampton, Southampton, UK., Gutiérrez C; Department of Physics & Astronomy, University of Southampton, Southampton, UK.; Finnish Centre for Astronomy with ESO (FINCA), University of Turku, Turku, Finland.; Tuorla Observatory, Department of Physics and Astronomy, University of Turku, Turku, Finland., Hernandez Santisteban JV; SUPA School of Physics & Astronomy, University of St Andrews, St Andrews, UK., Jiménez-Ibarra F; Department of Physics and Astronomy, Macquarie University, Sydney, New South Wales, Australia.; Research Centre in Astronomy, Astrophysics and Astrophotonics, Macquarie University, Sydney, New South Wales, Australia., Matthews J; Institute of Astronomy, University of Cambridge, Cambridge, UK., Méndez M; Kapteyn Astronomical Institute, University of Groningen, Groningen, The Netherlands., Middleton M; Department of Physics & Astronomy, University of Southampton, Southampton, UK., Muñoz-Darias T; Instituto de Astrofísica de Canarias, La Laguna, Tenerife, Spain.; Departamento de Astrofísica, Universidad de La Laguna, La Laguna, Tenerife, Spain., Özbey Arabacı M; Department of Physics & Astronomy, University of Southampton, Southampton, UK., Pahari M; Department of Physics & Astronomy, University of Southampton, Southampton, UK.; Department of Physics, IIT Hyderabad, Hyderabad, India., Rhodes L; Astrophysics, Department of Physics, University of Oxford, Oxford, UK., Russell TD; Anton Pannekoek Institute for Astronomy, University of Amsterdam, Amsterdam, The Netherlands.; INAF, Istituto di Astrofisica Spaziale e Fisica Cosmica, Palermo, Italy., Scaringi S; Centre for Extragalactic Astronomy, Department of Physics, Durham University, Durham, UK., van den Eijnden J; Anton Pannekoek Institute for Astronomy, University of Amsterdam, Amsterdam, The Netherlands.; Astrophysics, Department of Physics, University of Oxford, Oxford, UK., Vasilopoulos G; Department of Astronomy, Yale University, New Haven, CT, USA.; Université de Strasbourg, CNRS, Observatoire Astronomique de Strasbourg, UMR 7550, Strasbourg, France., Vincentelli FM; Department of Physics & Astronomy, University of Southampton, Southampton, UK., Wiseman P; Department of Physics & Astronomy, University of Southampton, Southampton, UK.
Jazyk: angličtina
Zdroj: Nature [Nature] 2022 Mar; Vol. 603 (7899), pp. 52-57. Date of Electronic Publication: 2022 Mar 02.
DOI: 10.1038/s41586-021-04324-2
Abstrakt: All disc-accreting astrophysical objects produce powerful disc winds. In compact binaries containing neutron stars or black holes, accretion often takes place during violent outbursts. The main disc wind signatures during these eruptions are blue-shifted X-ray absorption lines, which are preferentially seen in disc-dominated 'soft states' 1,2 . By contrast, optical wind-formed lines have recently been detected in 'hard states', when a hot corona dominates the luminosity 3 . The relationship between these signatures is unknown, and no erupting system has as yet revealed wind-formed lines between the X-ray and optical bands, despite the many strong resonance transitions in this ultraviolet (UV) region 4 . Here we report that the transient neutron star binary Swift J1858.6-0814 exhibits wind-formed, blue-shifted absorption lines associated with C IV, N V and He II in time-resolved UV spectroscopy during a luminous hard state, which we interpret as a warm, moderately ionized outflow component in this state. Simultaneously observed optical lines also display transient blue-shifted absorption. Decomposing the UV data into constant and variable components, the blue-shifted absorption is associated with the former. This implies that the outflow is not associated with the luminous flares in the data. The joint presence of UV and optical wind features reveals a multi-phase and/or spatially stratified evaporative outflow from the outer disc 5 . This type of persistent mass loss across all accretion states has been predicted by radiation-hydrodynamic simulations 6 and helps to explain the shorter-than-expected duration of outbursts 7 .
(© 2022. The Author(s), under exclusive licence to Springer Nature Limited.)
Databáze: MEDLINE
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