|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'504'928
Articles rated: 2609
25 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Discovery of Sub-Millisecond Quasi-Periodic Oscillations in the X-Ray Flux of Scorpius X-1 | | M. Van der Klis
; J.H. Swank
; W. Zhang
; K. Jahoda
; E.H. Morgan
; W.H.G. Lewin
; B. Vaughan
; J. Van Paradijs
; | | Date: |
9 Jul 1996 | | Subject: | astro-ph | | Affiliation: | Astronomical Institute ``Anton Pannekoek’’, University of Amsterdam and Center for High-Energy Astrophysics, Amsterdam), J.H. Swank, W. Zhang, K. Jahoda (Goddard Space Flight Center, NASA), E.H. Morgan, W.H.G. Lewin (MIT), B. Vaughan (Calte | | Abstract: | We report the discovery, with NASA’s Rossi X-ray Timing Explorer (RXTE), of the first sub-millisecond oscillation found in a celestial X-ray source. The quasi-periodic oscillations (QPO) come from Sco X-1 and have a frequency of approximately 1100 Hz, amplitudes of 0.6-1.2% (rms) and are relatively coherent, with Q up to ~10^2. The frequency of the QPO increases with accretion rate, rising from 1050 to 1130 Hz when the source moves from top to bottom along the normal branch in the X-ray color-color diagram, and shows a strong, approximately linear correlation with the frequency of the well-known 6-20 Hz normal/flaring branch QPO. We also report the discovery of QPO with a frequency near 800 Hz that occurs, simultaneously with the 1100 Hz QPO, in the upper normal branch. We discuss several possible interpretations, one involving a millisecond X-ray pulsar whose pulses we see reflected off accretion-flow inhomogeneities. Finally, we report the discovery of ~45 Hz QPO, most prominent in the middle of the normal branch, which might be magnetospheric beat-frequency QPO. | | Source: | arXiv, astro-ph/9607047 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER