Discovery of Kilohertz Quasi-periodic Oscillations in GX 17+2

Autores
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.
Año de publicación
1997
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We observed the low-mass X-ray binary and Z source GX 17+2 with the Rossi X-Ray Timing Explorer 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.
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Astronomía
accretion, accretion disks
stars: individual (GX 1712)
stars: neutron
X-rays: stars
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:10915/123155

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oai_identifier_str oai:sedici.unlp.edu.ar:10915/123155
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Discovery of Kilohertz Quasi-periodic Oscillations in GX 17+2Wijnands, RudyHoman, JeroenKlis, Michiel van derMéndez, Mariano R.Kuulkers, ErikParadijs, Jan vanLewin, Walter H. G.Lamb, Frederick K.Psaltis, DimitriosVaughan, Brian A.Astronomíaaccretion, accretion disksstars: individual (GX 1712)stars: neutronX-rays: starsWe 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.Facultad de Ciencias Astronómicas y Geofísicas1997-12-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf157-160http://sedici.unlp.edu.ar/handle/10915/123155enginfo:eu-repo/semantics/altIdentifier/issn/0004-637Xinfo:eu-repo/semantics/altIdentifier/doi/10.1086/311039info: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:UNLP2025-09-29T11:29:18Zoai:sedici.unlp.edu.ar:10915/123155Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:29:19.029SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Discovery of Kilohertz Quasi-periodic Oscillations in GX 17+2
title Discovery of Kilohertz Quasi-periodic Oscillations in GX 17+2
spellingShingle Discovery of Kilohertz Quasi-periodic Oscillations in GX 17+2
Wijnands, Rudy
Astronomía
accretion, accretion disks
stars: individual (GX 1712)
stars: neutron
X-rays: stars
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
dc.creator.none.fl_str_mv 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 Wijnands, Rudy
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_role author
author2 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.
author2_role author
author
author
author
author
author
author
author
author
dc.subject.none.fl_str_mv Astronomía
accretion, accretion disks
stars: individual (GX 1712)
stars: neutron
X-rays: stars
topic Astronomía
accretion, accretion disks
stars: individual (GX 1712)
stars: neutron
X-rays: stars
dc.description.none.fl_txt_mv 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.
Facultad de Ciencias Astronómicas y Geofísicas
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.
publishDate 1997
dc.date.none.fl_str_mv 1997-12-01
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/10915/123155
url http://sedici.unlp.edu.ar/handle/10915/123155
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0004-637X
info:eu-repo/semantics/altIdentifier/doi/10.1086/311039
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
157-160
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instname:Universidad Nacional de La Plata
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