RXTE observations of the neutron star low-mass X-ray binary GX 17+2: Correlated X-ray spectral and timing behavior

Autores
Homan, Jeroen; Klis, Michiel V. van der; Jonker, Peter G.; Wijnands, Rudy; Kuulkers, Erik; Méndez, Mariano R.; Lewin, Walter H. G.
Año de publicación
2002
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
We have analyzed ∼600 ks of Rossi X-Ray Timing Explorer data of the neutron star low-mass X-ray binary and Z source GX 17+2. A study was performed of the properties of the noise components and quasi-periodic oscillations (QPOs) as a function of the broadband spectral properties, with the main goal to study the relation between the frequencies of the horizontal branch (HBO) and upper kHz QPOs. It was found that when the upper kHz QPO frequency is below 1030 Hz these frequencies correlate, whereas above 1030 Hz they anticorrelate. GX 17+2 is the first source in which this is observed. We also found that the frequency difference of the high-frequency QPOs was not constant and that the quality factors (Q-values) of the HBO, its second harmonic, and the kHz QPOs are similar and vary almost hand in hand by a factor of more than 3. Observations of the normal branch oscillations during two type I X-ray bursts showed that their absolute amplitude decreased as the flux from the neutron star became stronger. We discuss these and other findings in terms of models that have been proposed for these phenomena. We also compare the behavior of GX 17+2 and other Z sources with that of black hole sources and consider the possibility that the mass accretion rate might not be the driving force behind all spectral and variability changes.
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Ciencias Astronómicas
Accretion, accretion disks
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:10915/84610

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oai_identifier_str oai:sedici.unlp.edu.ar:10915/84610
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling RXTE observations of the neutron star low-mass X-ray binary GX 17+2: Correlated X-ray spectral and timing behaviorHoman, JeroenKlis, Michiel V. van derJonker, Peter G.Wijnands, RudyKuulkers, ErikMéndez, Mariano R.Lewin, Walter H. G.Ciencias AstronómicasAccretion, accretion disksX-rays: starsWe have analyzed ∼600 ks of <i>Rossi X-Ray Timing Explorer</i> data of the neutron star low-mass X-ray binary and Z source GX 17+2. A study was performed of the properties of the noise components and quasi-periodic oscillations (QPOs) as a function of the broadband spectral properties, with the main goal to study the relation between the frequencies of the horizontal branch (HBO) and upper kHz QPOs. It was found that when the upper kHz QPO frequency is below 1030 Hz these frequencies correlate, whereas above 1030 Hz they anticorrelate. GX 17+2 is the first source in which this is observed. We also found that the frequency difference of the high-frequency QPOs was not constant and that the quality factors (Q-values) of the HBO, its second harmonic, and the kHz QPOs are similar and vary almost hand in hand by a factor of more than 3. Observations of the normal branch oscillations during two type I X-ray bursts showed that their absolute amplitude decreased as the flux from the neutron star became stronger. We discuss these and other findings in terms of models that have been proposed for these phenomena. We also compare the behavior of GX 17+2 and other Z sources with that of black hole sources and consider the possibility that the mass accretion rate might not be the driving force behind all spectral and variability changes.Facultad de Ciencias Astronómicas y Geofísicas2002info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf878-900http://sedici.unlp.edu.ar/handle/10915/84610enginfo:eu-repo/semantics/altIdentifier/issn/0004-637Xinfo:eu-repo/semantics/altIdentifier/doi/10.1086/339057info: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:UNLP2025-09-29T11:16:15Zoai:sedici.unlp.edu.ar:10915/84610Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:16:16.303SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv RXTE observations of the neutron star low-mass X-ray binary GX 17+2: Correlated X-ray spectral and timing behavior
title RXTE observations of the neutron star low-mass X-ray binary GX 17+2: Correlated X-ray spectral and timing behavior
spellingShingle RXTE observations of the neutron star low-mass X-ray binary GX 17+2: Correlated X-ray spectral and timing behavior
Homan, Jeroen
Ciencias Astronómicas
Accretion, accretion disks
X-rays: stars
title_short RXTE observations of the neutron star low-mass X-ray binary GX 17+2: Correlated X-ray spectral and timing behavior
title_full RXTE observations of the neutron star low-mass X-ray binary GX 17+2: Correlated X-ray spectral and timing behavior
title_fullStr RXTE observations of the neutron star low-mass X-ray binary GX 17+2: Correlated X-ray spectral and timing behavior
title_full_unstemmed RXTE observations of the neutron star low-mass X-ray binary GX 17+2: Correlated X-ray spectral and timing behavior
title_sort RXTE observations of the neutron star low-mass X-ray binary GX 17+2: Correlated X-ray spectral and timing behavior
dc.creator.none.fl_str_mv Homan, Jeroen
Klis, Michiel V. van der
Jonker, Peter G.
Wijnands, Rudy
Kuulkers, Erik
Méndez, Mariano R.
Lewin, Walter H. G.
author Homan, Jeroen
author_facet Homan, Jeroen
Klis, Michiel V. van der
Jonker, Peter G.
Wijnands, Rudy
Kuulkers, Erik
Méndez, Mariano R.
Lewin, Walter H. G.
author_role author
author2 Klis, Michiel V. van der
Jonker, Peter G.
Wijnands, Rudy
Kuulkers, Erik
Méndez, Mariano R.
Lewin, Walter H. G.
author2_role author
author
author
author
author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Accretion, accretion disks
X-rays: stars
topic Ciencias Astronómicas
Accretion, accretion disks
X-rays: stars
dc.description.none.fl_txt_mv We have analyzed ∼600 ks of <i>Rossi X-Ray Timing Explorer</i> data of the neutron star low-mass X-ray binary and Z source GX 17+2. A study was performed of the properties of the noise components and quasi-periodic oscillations (QPOs) as a function of the broadband spectral properties, with the main goal to study the relation between the frequencies of the horizontal branch (HBO) and upper kHz QPOs. It was found that when the upper kHz QPO frequency is below 1030 Hz these frequencies correlate, whereas above 1030 Hz they anticorrelate. GX 17+2 is the first source in which this is observed. We also found that the frequency difference of the high-frequency QPOs was not constant and that the quality factors (Q-values) of the HBO, its second harmonic, and the kHz QPOs are similar and vary almost hand in hand by a factor of more than 3. Observations of the normal branch oscillations during two type I X-ray bursts showed that their absolute amplitude decreased as the flux from the neutron star became stronger. We discuss these and other findings in terms of models that have been proposed for these phenomena. We also compare the behavior of GX 17+2 and other Z sources with that of black hole sources and consider the possibility that the mass accretion rate might not be the driving force behind all spectral and variability changes.
Facultad de Ciencias Astronómicas y Geofísicas
description We have analyzed ∼600 ks of <i>Rossi X-Ray Timing Explorer</i> data of the neutron star low-mass X-ray binary and Z source GX 17+2. A study was performed of the properties of the noise components and quasi-periodic oscillations (QPOs) as a function of the broadband spectral properties, with the main goal to study the relation between the frequencies of the horizontal branch (HBO) and upper kHz QPOs. It was found that when the upper kHz QPO frequency is below 1030 Hz these frequencies correlate, whereas above 1030 Hz they anticorrelate. GX 17+2 is the first source in which this is observed. We also found that the frequency difference of the high-frequency QPOs was not constant and that the quality factors (Q-values) of the HBO, its second harmonic, and the kHz QPOs are similar and vary almost hand in hand by a factor of more than 3. Observations of the normal branch oscillations during two type I X-ray bursts showed that their absolute amplitude decreased as the flux from the neutron star became stronger. We discuss these and other findings in terms of models that have been proposed for these phenomena. We also compare the behavior of GX 17+2 and other Z sources with that of black hole sources and consider the possibility that the mass accretion rate might not be the driving force behind all spectral and variability changes.
publishDate 2002
dc.date.none.fl_str_mv 2002
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/10915/84610
url http://sedici.unlp.edu.ar/handle/10915/84610
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/10.1086/339057
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
878-900
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
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instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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