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
.jpg)
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/123089
Ver los metadatos del registro completo
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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:UNLP2025-10-22T17:10:10Zoai: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:13292025-10-22 17:10:10.253SEDICI (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 |
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1997-07-10 |
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info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Articulo http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
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