The amplitude of the kilohertz quasi-periodic oscillations in 4U 1728-34, 4U 1608-52, and aquila X-1, as a function of X-ray intensity
- Autores
- Méndez, Mariano R.; Klis, Michiel van der; Ford, Eric C.
- Año de publicación
- 2001
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- We study the kilohertz quasi-periodic oscillations (kHz QPOs) in the low-mass X-ray binaries 4U 1728-34, 4U 1608-52, and Aq1 X-1. Each source traces out a set of nearly parallel tracks in a frequency versus X-ray count rate diagram. We find that between two of these tracks, for similar QPO frequency, the 2-60 keV source count rate can differ by up to a factor of ∼4, whereas at the same time the rms amplitude of the kHz QPOs is only a factor of ∼1.1 different. We also find that, for 4U 1608-52 and Aq1 X-1, the rms spectrum of the kHz QPOs does not depend upon which track the source occupies in the frequency versus X-ray count rate diagram. Our results for 4U 1728-34, 4U 1608-52, and Aq1 X-1 are inconsistent with simple "extra source of X-rays" scenarios for the parallel tracks, such as those in which the properties of the kHz QPOs are determined only by the mass accretion rate through the disk, whereas X-ray count rate also depends upon other sources of energy that do not affect the QPOs.
Facultad de Ciencias Astronómicas y Geofísicas - Materia
-
Ciencias Astronómicas
Accretion, accretion disks
Stars: individual (4U 1608-52, 4U 1728-34, Aquila X-1)
Stars: neutron
X-rays: stars - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by-nc-sa/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/84694
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The amplitude of the kilohertz quasi-periodic oscillations in 4U 1728-34, 4U 1608-52, and aquila X-1, as a function of X-ray intensityMéndez, Mariano R.Klis, Michiel van derFord, Eric C.Ciencias AstronómicasAccretion, accretion disksStars: individual (4U 1608-52, 4U 1728-34, Aquila X-1)Stars: neutronX-rays: starsWe study the kilohertz quasi-periodic oscillations (kHz QPOs) in the low-mass X-ray binaries 4U 1728-34, 4U 1608-52, and Aq1 X-1. Each source traces out a set of nearly parallel tracks in a frequency versus X-ray count rate diagram. We find that between two of these tracks, for similar QPO frequency, the 2-60 keV source count rate can differ by up to a factor of ∼4, whereas at the same time the rms amplitude of the kHz QPOs is only a factor of ∼1.1 different. We also find that, for 4U 1608-52 and Aq1 X-1, the rms spectrum of the kHz QPOs does not depend upon which track the source occupies in the frequency versus X-ray count rate diagram. Our results for 4U 1728-34, 4U 1608-52, and Aq1 X-1 are inconsistent with simple "extra source of X-rays" scenarios for the parallel tracks, such as those in which the properties of the kHz QPOs are determined only by the mass accretion rate through the disk, whereas X-ray count rate also depends upon other sources of energy that do not affect the QPOs.Facultad de Ciencias Astronómicas y Geofísicas2001info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf1016-1026http://sedici.unlp.edu.ar/handle/10915/84694enginfo:eu-repo/semantics/altIdentifier/issn/0004-637Xinfo:eu-repo/semantics/altIdentifier/doi/10.1086/323486info: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:UNLP2025-09-29T11:16:19Zoai:sedici.unlp.edu.ar:10915/84694Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:16:20.071SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
The amplitude of the kilohertz quasi-periodic oscillations in 4U 1728-34, 4U 1608-52, and aquila X-1, as a function of X-ray intensity |
title |
The amplitude of the kilohertz quasi-periodic oscillations in 4U 1728-34, 4U 1608-52, and aquila X-1, as a function of X-ray intensity |
spellingShingle |
The amplitude of the kilohertz quasi-periodic oscillations in 4U 1728-34, 4U 1608-52, and aquila X-1, as a function of X-ray intensity Méndez, Mariano R. Ciencias Astronómicas Accretion, accretion disks Stars: individual (4U 1608-52, 4U 1728-34, Aquila X-1) Stars: neutron X-rays: stars |
title_short |
The amplitude of the kilohertz quasi-periodic oscillations in 4U 1728-34, 4U 1608-52, and aquila X-1, as a function of X-ray intensity |
title_full |
The amplitude of the kilohertz quasi-periodic oscillations in 4U 1728-34, 4U 1608-52, and aquila X-1, as a function of X-ray intensity |
title_fullStr |
The amplitude of the kilohertz quasi-periodic oscillations in 4U 1728-34, 4U 1608-52, and aquila X-1, as a function of X-ray intensity |
title_full_unstemmed |
The amplitude of the kilohertz quasi-periodic oscillations in 4U 1728-34, 4U 1608-52, and aquila X-1, as a function of X-ray intensity |
title_sort |
The amplitude of the kilohertz quasi-periodic oscillations in 4U 1728-34, 4U 1608-52, and aquila X-1, as a function of X-ray intensity |
dc.creator.none.fl_str_mv |
Méndez, Mariano R. Klis, Michiel van der Ford, Eric C. |
author |
Méndez, Mariano R. |
author_facet |
Méndez, Mariano R. Klis, Michiel van der Ford, Eric C. |
author_role |
author |
author2 |
Klis, Michiel van der Ford, Eric C. |
author2_role |
author author |
dc.subject.none.fl_str_mv |
Ciencias Astronómicas Accretion, accretion disks Stars: individual (4U 1608-52, 4U 1728-34, Aquila X-1) Stars: neutron X-rays: stars |
topic |
Ciencias Astronómicas Accretion, accretion disks Stars: individual (4U 1608-52, 4U 1728-34, Aquila X-1) Stars: neutron X-rays: stars |
dc.description.none.fl_txt_mv |
We study the kilohertz quasi-periodic oscillations (kHz QPOs) in the low-mass X-ray binaries 4U 1728-34, 4U 1608-52, and Aq1 X-1. Each source traces out a set of nearly parallel tracks in a frequency versus X-ray count rate diagram. We find that between two of these tracks, for similar QPO frequency, the 2-60 keV source count rate can differ by up to a factor of ∼4, whereas at the same time the rms amplitude of the kHz QPOs is only a factor of ∼1.1 different. We also find that, for 4U 1608-52 and Aq1 X-1, the rms spectrum of the kHz QPOs does not depend upon which track the source occupies in the frequency versus X-ray count rate diagram. Our results for 4U 1728-34, 4U 1608-52, and Aq1 X-1 are inconsistent with simple "extra source of X-rays" scenarios for the parallel tracks, such as those in which the properties of the kHz QPOs are determined only by the mass accretion rate through the disk, whereas X-ray count rate also depends upon other sources of energy that do not affect the QPOs. Facultad de Ciencias Astronómicas y Geofísicas |
description |
We study the kilohertz quasi-periodic oscillations (kHz QPOs) in the low-mass X-ray binaries 4U 1728-34, 4U 1608-52, and Aq1 X-1. Each source traces out a set of nearly parallel tracks in a frequency versus X-ray count rate diagram. We find that between two of these tracks, for similar QPO frequency, the 2-60 keV source count rate can differ by up to a factor of ∼4, whereas at the same time the rms amplitude of the kHz QPOs is only a factor of ∼1.1 different. We also find that, for 4U 1608-52 and Aq1 X-1, the rms spectrum of the kHz QPOs does not depend upon which track the source occupies in the frequency versus X-ray count rate diagram. Our results for 4U 1728-34, 4U 1608-52, and Aq1 X-1 are inconsistent with simple "extra source of X-rays" scenarios for the parallel tracks, such as those in which the properties of the kHz QPOs are determined only by the mass accretion rate through the disk, whereas X-ray count rate also depends upon other sources of energy that do not affect the QPOs. |
publishDate |
2001 |
dc.date.none.fl_str_mv |
2001 |
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/10915/84694 |
url |
http://sedici.unlp.edu.ar/handle/10915/84694 |
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/10.1086/323486 |
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) |
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openAccess |
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http://creativecommons.org/licenses/by-nc-sa/4.0/ Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0) |
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