Discovery of Kilohertz Quasi-periodic Oscillations in GX 17+2
We observed the low-mass X-ray binary and Z source GX 17+2 with the <i>Rossi X-Ray Timing Explorer</i> during 1997 February 6-8, April 1-4, and July 26-27. The X-ray color-color diagram shows a clear Z track. Two simultaneous kHz quasi-periodic oscillations (QPOs) are present in each obs...
| Autores principales: | , , , , , , , , , |
|---|---|
| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
1997
|
| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/123155 |
| Aporte de: |
| id |
I19-R120-10915-123155 |
|---|---|
| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Astronomía accretion, accretion disks stars: individual (GX 1712) stars: neutron X-rays: stars |
| spellingShingle |
Astronomía accretion, accretion disks stars: individual (GX 1712) stars: neutron X-rays: stars Wijnands, Rudy Homan, Jeroen Klis, Michiel van der Méndez, Mariano R. Kuulkers, Erik Paradijs, Jan van Lewin, Walter H. G. Lamb, Frederick K. Psaltis, Dimitrios Vaughan, Brian A. Discovery of Kilohertz Quasi-periodic Oscillations in GX 17+2 |
| topic_facet |
Astronomía accretion, accretion disks stars: individual (GX 1712) stars: neutron X-rays: stars |
| description |
We observed the low-mass X-ray binary and Z source GX 17+2 with the <i>Rossi X-Ray Timing Explorer</i> during 1997 February 6-8, April 1-4, and July 26-27. The X-ray color-color diagram shows a clear Z track. Two simultaneous kHz quasi-periodic oscillations (QPOs) are present in each observation, whose frequencies are well correlated with the position of the source on the Z track. At the left end of the horizontal branch (HB), only the higher frequency peak is observed, at 645 ± 9 Hz, with an rms amplitude of 5.7% ± 0.5% and an FWHM of 183 ± 35 Hz. When the source moves down the Z track to the upper normal branch, the frequency of the kHz QPO increases to 1087 ± 12 Hz, and the rms amplitude and FWHM decrease by a factor of 2. Farther down the Z track, the QPO becomes undetectable, with rms upper limits typically of 2.0%. Halfway down the HB, a second QPO appears in the power spectra with a frequency of 480 ± 23 Hz. The frequency of this QPO also increases when the source moves along the Z track, up to 781 ± 11 Hz halfway down the normal branch, while the rms amplitude and FWHM stay approximately constant at 2.5% and 70 Hz. The QPO frequency difference is constant at 293.5 ± 7.5 Hz. Simultaneously with the kHz QPOs, we detect HB QPOs (HBOs). The simultaneous presence of HBOs and kHz QPOs excludes the magnetospheric beat-frequency model as the explanation for at least one of these two phenomena. |
| format |
Articulo Articulo |
| author |
Wijnands, Rudy Homan, Jeroen Klis, Michiel van der Méndez, Mariano R. Kuulkers, Erik Paradijs, Jan van Lewin, Walter H. G. Lamb, Frederick K. Psaltis, Dimitrios Vaughan, Brian A. |
| author_facet |
Wijnands, Rudy Homan, Jeroen Klis, Michiel van der Méndez, Mariano R. Kuulkers, Erik Paradijs, Jan van Lewin, Walter H. G. Lamb, Frederick K. Psaltis, Dimitrios Vaughan, Brian A. |
| author_sort |
Wijnands, Rudy |
| title |
Discovery of Kilohertz Quasi-periodic Oscillations in GX 17+2 |
| title_short |
Discovery of Kilohertz Quasi-periodic Oscillations in GX 17+2 |
| title_full |
Discovery of Kilohertz Quasi-periodic Oscillations in GX 17+2 |
| title_fullStr |
Discovery of Kilohertz Quasi-periodic Oscillations in GX 17+2 |
| title_full_unstemmed |
Discovery of Kilohertz Quasi-periodic Oscillations in GX 17+2 |
| title_sort |
discovery of kilohertz quasi-periodic oscillations in gx 17+2 |
| publishDate |
1997 |
| url |
http://sedici.unlp.edu.ar/handle/10915/123155 |
| work_keys_str_mv |
AT wijnandsrudy discoveryofkilohertzquasiperiodicoscillationsingx172 AT homanjeroen discoveryofkilohertzquasiperiodicoscillationsingx172 AT klismichielvander discoveryofkilohertzquasiperiodicoscillationsingx172 AT mendezmarianor discoveryofkilohertzquasiperiodicoscillationsingx172 AT kuulkerserik discoveryofkilohertzquasiperiodicoscillationsingx172 AT paradijsjanvan discoveryofkilohertzquasiperiodicoscillationsingx172 AT lewinwalterhg discoveryofkilohertzquasiperiodicoscillationsingx172 AT lambfrederickk discoveryofkilohertzquasiperiodicoscillationsingx172 AT psaltisdimitrios discoveryofkilohertzquasiperiodicoscillationsingx172 AT vaughanbriana discoveryofkilohertzquasiperiodicoscillationsingx172 |
| bdutipo_str |
Repositorios |
| _version_ |
1764820449831682049 |