Discovery of microsecond time lags in kilohertz QPOs

Autores
Vaughan, B. A.; Klis, M. van der; Méndez, Mariano R.; Paradijs, J. van; Wijnands, R.; Lewin, W. H. G.; Lamb, F. K.; Psaltis, D.; Kuulkers, E.; Oosterbroek, T.
Año de publicación
1997
Idioma
español castellano
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Using the Rossi X-Ray Timing Explorer, we have measured ~27 μs time delays in 830 Hz quasi-periodic oscillations (QPOs) between 4-6 and 11-17 keV in 4U 1608-52, with high-energy photons lagging low-energy photons, and found upper limits to the time delays of 45 μs between 2-6.5 and 6.5-67 keV in ~730 Hz QPOs in 4U 0614+091 and 30 μs between 8.7-12.4 and 12.4-67 keV in ~870 Hz QPOs in 4U 1636-53. We also find that the cross-coherence function between QPOs at different energies is greater than 0.85 with 95% confidence in 4U 1608-52 and 4U 1636-53. If Compton upscattering of low-energy X-rays in a region with an optical depth of a few is responsible for the delays, then the Compton upscattering region is between a few kilometers and a few tens of kilometers in size.
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Ciencias Astronómicas
Physics
Astronomy
Photon
Accretion disc
Time delays
Microsecond
Astrophysics
Spectral line
Optical depth (astrophysics)
Low energy photons
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/123089

id SEDICI_fefb0f388a67af1d9b88e051ae5c74d9
oai_identifier_str oai:sedici.unlp.edu.ar:10915/123089
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Discovery of microsecond time lags in kilohertz QPOsVaughan, B. A.Klis, M. van derMéndez, Mariano R.Paradijs, J. vanWijnands, R.Lewin, W. H. G.Lamb, F. K.Psaltis, D.Kuulkers, E.Oosterbroek, T.Ciencias AstronómicasPhysicsAstronomyPhotonAccretion discTime delaysMicrosecondAstrophysicsSpectral lineOptical depth (astrophysics)Low energy photonsUsing the Rossi X-Ray Timing Explorer, we have measured ~27 μs time delays in 830 Hz quasi-periodic oscillations (QPOs) between 4-6 and 11-17 keV in 4U 1608-52, with high-energy photons lagging low-energy photons, and found upper limits to the time delays of 45 μs between 2-6.5 and 6.5-67 keV in ~730 Hz QPOs in 4U 0614+091 and 30 μs between 8.7-12.4 and 12.4-67 keV in ~870 Hz QPOs in 4U 1636-53. We also find that the cross-coherence function between QPOs at different energies is greater than 0.85 with 95% confidence in 4U 1608-52 and 4U 1636-53. If Compton upscattering of low-energy X-rays in a region with an optical depth of a few is responsible for the delays, then the Compton upscattering region is between a few kilometers and a few tens of kilometers in size.Facultad de Ciencias Astronómicas y Geofísicas1997-07-10info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfL115-L118http://sedici.unlp.edu.ar/handle/10915/123089spainfo:eu-repo/semantics/altIdentifier/issn/0004-637Xinfo:eu-repo/semantics/altIdentifier/doi/10.1086/310740info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:29:14Zoai:sedici.unlp.edu.ar:10915/123089Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:29:15.195SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Discovery of microsecond time lags in kilohertz QPOs
title Discovery of microsecond time lags in kilohertz QPOs
spellingShingle Discovery of microsecond time lags in kilohertz QPOs
Vaughan, B. A.
Ciencias Astronómicas
Physics
Astronomy
Photon
Accretion disc
Time delays
Microsecond
Astrophysics
Spectral line
Optical depth (astrophysics)
Low energy photons
title_short Discovery of microsecond time lags in kilohertz QPOs
title_full Discovery of microsecond time lags in kilohertz QPOs
title_fullStr Discovery of microsecond time lags in kilohertz QPOs
title_full_unstemmed Discovery of microsecond time lags in kilohertz QPOs
title_sort Discovery of microsecond time lags in kilohertz QPOs
dc.creator.none.fl_str_mv Vaughan, B. A.
Klis, M. van der
Méndez, Mariano R.
Paradijs, J. van
Wijnands, R.
Lewin, W. H. G.
Lamb, F. K.
Psaltis, D.
Kuulkers, E.
Oosterbroek, T.
author Vaughan, B. A.
author_facet Vaughan, B. A.
Klis, M. van der
Méndez, Mariano R.
Paradijs, J. van
Wijnands, R.
Lewin, W. H. G.
Lamb, F. K.
Psaltis, D.
Kuulkers, E.
Oosterbroek, T.
author_role author
author2 Klis, M. van der
Méndez, Mariano R.
Paradijs, J. van
Wijnands, R.
Lewin, W. H. G.
Lamb, F. K.
Psaltis, D.
Kuulkers, E.
Oosterbroek, T.
author2_role author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Physics
Astronomy
Photon
Accretion disc
Time delays
Microsecond
Astrophysics
Spectral line
Optical depth (astrophysics)
Low energy photons
topic Ciencias Astronómicas
Physics
Astronomy
Photon
Accretion disc
Time delays
Microsecond
Astrophysics
Spectral line
Optical depth (astrophysics)
Low energy photons
dc.description.none.fl_txt_mv Using the Rossi X-Ray Timing Explorer, we have measured ~27 μs time delays in 830 Hz quasi-periodic oscillations (QPOs) between 4-6 and 11-17 keV in 4U 1608-52, with high-energy photons lagging low-energy photons, and found upper limits to the time delays of 45 μs between 2-6.5 and 6.5-67 keV in ~730 Hz QPOs in 4U 0614+091 and 30 μs between 8.7-12.4 and 12.4-67 keV in ~870 Hz QPOs in 4U 1636-53. We also find that the cross-coherence function between QPOs at different energies is greater than 0.85 with 95% confidence in 4U 1608-52 and 4U 1636-53. If Compton upscattering of low-energy X-rays in a region with an optical depth of a few is responsible for the delays, then the Compton upscattering region is between a few kilometers and a few tens of kilometers in size.
Facultad de Ciencias Astronómicas y Geofísicas
description Using the Rossi X-Ray Timing Explorer, we have measured ~27 μs time delays in 830 Hz quasi-periodic oscillations (QPOs) between 4-6 and 11-17 keV in 4U 1608-52, with high-energy photons lagging low-energy photons, and found upper limits to the time delays of 45 μs between 2-6.5 and 6.5-67 keV in ~730 Hz QPOs in 4U 0614+091 and 30 μs between 8.7-12.4 and 12.4-67 keV in ~870 Hz QPOs in 4U 1636-53. We also find that the cross-coherence function between QPOs at different energies is greater than 0.85 with 95% confidence in 4U 1608-52 and 4U 1636-53. If Compton upscattering of low-energy X-rays in a region with an optical depth of a few is responsible for the delays, then the Compton upscattering region is between a few kilometers and a few tens of kilometers in size.
publishDate 1997
dc.date.none.fl_str_mv 1997-07-10
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/123089
url http://sedici.unlp.edu.ar/handle/10915/123089
dc.language.none.fl_str_mv spa
language spa
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0004-637X
info:eu-repo/semantics/altIdentifier/doi/10.1086/310740
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
L115-L118
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
_version_ 1844616171699044352
score 13.070432