Swift UVOT observations of the 2015 outburst of V404 Cygni

The black hole binary, V404 Cygni, went into outburst in 2015 June, after 26 years of X-ray quiescence. We observed the outburst with the Neil Gehrels Swift observatory. We present optical/UV observations taken with the Swift Ultra-violet Optical Telescope, and compare them with the X-ray observatio...

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Autores: Oates, S.R., Motta, S., Beardmore, A. P., Russell, D. M., Gandhi, Poshak, Kuin, N. P. M., De Pasquale, M., Altamirano, Diego, Breeveld, A. A., Castro-Tirado, Alberto J., Knigge, C., Page, Matt, Steeghs, D.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2019
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/191919
Acceso en línea:http://hdl.handle.net/10261/191919
Access Level:acceso abierto
Palabra clave:X-ray binaries
X-ray bursts
X-rays: individual: V404 Cyg
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spelling Swift UVOT observations of the 2015 outburst of V404 CygniOates, S.R.Motta, S.Beardmore, A. P.Russell, D. M.Gandhi, PoshakKuin, N. P. M.De Pasquale, M.Altamirano, DiegoBreeveld, A. A.Castro-Tirado, Alberto J.Knigge, C.Page, MattSteeghs, D.X-ray binariesX-ray burstsX-rays: individual: V404 CygThe black hole binary, V404 Cygni, went into outburst in 2015 June, after 26 years of X-ray quiescence. We observed the outburst with the Neil Gehrels Swift observatory. We present optical/UV observations taken with the Swift Ultra-violet Optical Telescope, and compare them with the X-ray observations obtained with the Swift X-ray Telescope. We find that dust extinction affecting the optical/UV does not correlate with absorption due to neutral hydrogen that affects the X-ray emission. We suggest there is a small inhomogeneous high-density absorber containing a negligible amount of dust, close to the black hole. Overall, temporal variations in the optical/UV appear to trace those in the X-rays. During some epochs we observe an optical time-lag of (15–35) s. For both the optical/UV and X-rays, the amplitude of the variations correlates with flux, but this correlation is less significant in the optical/UV. The variability in the light curves may be produced by a complex combination of processes. Some of the X-ray variability may be due to the presence of a local, inhomogeneous and dust-free absorber, while variability visible in both the X-ray and optical/UV may instead be driven by the accretion flow: the X-rays are produced in the inner accretion disc, some of which are reprocessed to the optical/UV; and/or the X-ray and optical/UV emission is produced within the jet. © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical SocietySRO gratefully acknowledges the support of the Leverhulme Trust Early Career Fellowship. AJCT and SRO acknowledge support from the Spanish Ministry, Project Number AYA2012-39727-C03-01. SEM acknowledges the Violette and Samuel Glasstone Research Fellowship program and the UK Science and Technology Facilities Council (STFC) for financial support. PG thanks STFC and UKIERI for support. This work was also supported by the UK Space Agency.Peer reviewedOxford University PressLeverhulme TrustMinisterio de Economía y Competitividad (España)Science and Technology Facilities Council (UK)UK-India Education and Research InitiativeUK Space AgencyViolette & Samuel Glasstone Research Fellowships in ScienceConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201920192019info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501Publisher's versioninfo:eu-repo/semantics/publishedVersionhttp://hdl.handle.net/10261/191919reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1093/mnras/stz1998Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1919192026-05-22T06:33:51Z
dc.title.none.fl_str_mv Swift UVOT observations of the 2015 outburst of V404 Cygni
title Swift UVOT observations of the 2015 outburst of V404 Cygni
spellingShingle Swift UVOT observations of the 2015 outburst of V404 Cygni
Oates, S.R.
X-ray binaries
X-ray bursts
X-rays: individual: V404 Cyg
title_short Swift UVOT observations of the 2015 outburst of V404 Cygni
title_full Swift UVOT observations of the 2015 outburst of V404 Cygni
title_fullStr Swift UVOT observations of the 2015 outburst of V404 Cygni
title_full_unstemmed Swift UVOT observations of the 2015 outburst of V404 Cygni
title_sort Swift UVOT observations of the 2015 outburst of V404 Cygni
dc.creator.none.fl_str_mv Oates, S.R.
Motta, S.
Beardmore, A. P.
Russell, D. M.
Gandhi, Poshak
Kuin, N. P. M.
De Pasquale, M.
Altamirano, Diego
Breeveld, A. A.
Castro-Tirado, Alberto J.
Knigge, C.
Page, Matt
Steeghs, D.
author Oates, S.R.
author_facet Oates, S.R.
Motta, S.
Beardmore, A. P.
Russell, D. M.
Gandhi, Poshak
Kuin, N. P. M.
De Pasquale, M.
Altamirano, Diego
Breeveld, A. A.
Castro-Tirado, Alberto J.
Knigge, C.
Page, Matt
Steeghs, D.
author_role author
author2 Motta, S.
Beardmore, A. P.
Russell, D. M.
Gandhi, Poshak
Kuin, N. P. M.
De Pasquale, M.
Altamirano, Diego
Breeveld, A. A.
Castro-Tirado, Alberto J.
Knigge, C.
Page, Matt
Steeghs, D.
author2_role author
author
author
author
author
author
author
author
author
author
author
author
dc.contributor.none.fl_str_mv Leverhulme Trust
Ministerio de Economía y Competitividad (España)
Science and Technology Facilities Council (UK)
UK-India Education and Research Initiative
UK Space Agency
Violette & Samuel Glasstone Research Fellowships in Science
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv X-ray binaries
X-ray bursts
X-rays: individual: V404 Cyg
topic X-ray binaries
X-ray bursts
X-rays: individual: V404 Cyg
description The black hole binary, V404 Cygni, went into outburst in 2015 June, after 26 years of X-ray quiescence. We observed the outburst with the Neil Gehrels Swift observatory. We present optical/UV observations taken with the Swift Ultra-violet Optical Telescope, and compare them with the X-ray observations obtained with the Swift X-ray Telescope. We find that dust extinction affecting the optical/UV does not correlate with absorption due to neutral hydrogen that affects the X-ray emission. We suggest there is a small inhomogeneous high-density absorber containing a negligible amount of dust, close to the black hole. Overall, temporal variations in the optical/UV appear to trace those in the X-rays. During some epochs we observe an optical time-lag of (15–35) s. For both the optical/UV and X-rays, the amplitude of the variations correlates with flux, but this correlation is less significant in the optical/UV. The variability in the light curves may be produced by a complex combination of processes. Some of the X-ray variability may be due to the presence of a local, inhomogeneous and dust-free absorber, while variability visible in both the X-ray and optical/UV may instead be driven by the accretion flow: the X-rays are produced in the inner accretion disc, some of which are reprocessed to the optical/UV; and/or the X-ray and optical/UV emission is produced within the jet. © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
publishDate 2019
dc.date.none.fl_str_mv 2019
2019
2019
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
Publisher's version
info:eu-repo/semantics/publishedVersion
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/191919
url http://hdl.handle.net/10261/191919
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1093/mnras/stz1998
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Oxford University Press
publisher.none.fl_str_mv Oxford University Press
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812429

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