Discovery of microsecond time lags in kilohertz QPOs
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 ~73...
| Autores principales: | , , , , , , , , , |
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| Formato: | Articulo |
| Lenguaje: | Español |
| Publicado: |
1997
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/123089 |
| Aporte de: |
| id |
I19-R120-10915-123089 |
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| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Español |
| topic |
Ciencias Astronómicas Physics Astronomy Photon Accretion disc Time delays Microsecond Astrophysics Spectral line Optical depth (astrophysics) Low energy photons |
| spellingShingle |
Ciencias Astronómicas Physics Astronomy Photon Accretion disc Time delays Microsecond Astrophysics Spectral line Optical depth (astrophysics) Low energy photons 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. Discovery of microsecond time lags in kilohertz QPOs |
| topic_facet |
Ciencias Astronómicas Physics Astronomy Photon Accretion disc Time delays Microsecond Astrophysics Spectral line Optical depth (astrophysics) Low energy photons |
| 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. |
| format |
Articulo Articulo |
| author |
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_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_sort |
Vaughan, B. A. |
| title |
Discovery of microsecond time lags in kilohertz QPOs |
| 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 |
| publishDate |
1997 |
| url |
http://sedici.unlp.edu.ar/handle/10915/123089 |
| work_keys_str_mv |
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Repositorios |
| _version_ |
1764820449698512896 |