Correlated Timing and Spectral Variations of the Soft X-Ray Transient Aquila X-1 : Evidence for an Atoll Classification
- Autores
- Reig, Pablo; Méndez, Mariano R.; van der Klis, M.; Ford, Eric
- Año de publicación
- 2000
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- Based on Rossi X-Ray Timing Explorer data, we discuss the classification of the soft X-ray transient Aquila X-1 in the Z/atoll scheme and the relation of its kilohertz quasi-periodic oscillations (kHz QPOs) properties to the X-ray colors. The color-color diagram shows one elongated ("banana") structure and several "islands" of data points. The power spectra of the island are best represented by a broken power law whereas those of the banana by a power law below ~1 Hz plus an exponentially cutoff component at intermediate frequencies (30-60 Hz). The parameters of these two components change in correlation with the position of the source in the color-color diagram. Based on the pattern that the source shows in the color-color diagram and its aperiodic variability, we conclude that Aquila X-1 is an atoll source. We have also investigated the possible correlation between the frequency of the kHz QPOs and the position of the source in the color-color diagram. The complexity seen in the frequency versus count rate diagram is reduced to a single track when the frequency is plotted against hard or soft color.
Facultad de Ciencias Astronómicas y Geofísicas - Materia
-
Astronomía
Ciencias Astronómicas
accretion, accretion disks
stars : individual (Aquila X-1)
stars : neutron
X-rays : stars - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- http://creativecommons.org/licenses/by/4.0/
- Repositorio
- Institución
- Universidad Nacional de La Plata
- OAI Identificador
- oai:sedici.unlp.edu.ar:10915/127256
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Correlated Timing and Spectral Variations of the Soft X-Ray Transient Aquila X-1 : Evidence for an Atoll ClassificationReig, PabloMéndez, Mariano R.van der Klis, M.Ford, EricAstronomíaCiencias Astronómicasaccretion, accretion disksstars : individual (Aquila X-1)stars : neutronX-rays : starsBased on Rossi X-Ray Timing Explorer data, we discuss the classification of the soft X-ray transient Aquila X-1 in the Z/atoll scheme and the relation of its kilohertz quasi-periodic oscillations (kHz QPOs) properties to the X-ray colors. The color-color diagram shows one elongated ("banana") structure and several "islands" of data points. The power spectra of the island are best represented by a broken power law whereas those of the banana by a power law below ~1 Hz plus an exponentially cutoff component at intermediate frequencies (30-60 Hz). The parameters of these two components change in correlation with the position of the source in the color-color diagram. Based on the pattern that the source shows in the color-color diagram and its aperiodic variability, we conclude that Aquila X-1 is an atoll source. We have also investigated the possible correlation between the frequency of the kHz QPOs and the position of the source in the color-color diagram. The complexity seen in the frequency versus count rate diagram is reduced to a single track when the frequency is plotted against hard or soft color.Facultad de Ciencias Astronómicas y Geofísicas2000-02-20info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf916-922http://sedici.unlp.edu.ar/handle/10915/127256enginfo:eu-repo/semantics/altIdentifier/url/https://iopscience.iop.org/article/10.1086/308399info:eu-repo/semantics/altIdentifier/issn/0004-637xinfo:eu-repo/semantics/altIdentifier/issn/1538-4357info:eu-repo/semantics/altIdentifier/doi/10.1086/308399info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-09-29T11:30:42Zoai:sedici.unlp.edu.ar:10915/127256Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:30:43.204SEDICI (UNLP) - Universidad Nacional de La Platafalse |
dc.title.none.fl_str_mv |
Correlated Timing and Spectral Variations of the Soft X-Ray Transient Aquila X-1 : Evidence for an Atoll Classification |
title |
Correlated Timing and Spectral Variations of the Soft X-Ray Transient Aquila X-1 : Evidence for an Atoll Classification |
spellingShingle |
Correlated Timing and Spectral Variations of the Soft X-Ray Transient Aquila X-1 : Evidence for an Atoll Classification Reig, Pablo Astronomía Ciencias Astronómicas accretion, accretion disks stars : individual (Aquila X-1) stars : neutron X-rays : stars |
title_short |
Correlated Timing and Spectral Variations of the Soft X-Ray Transient Aquila X-1 : Evidence for an Atoll Classification |
title_full |
Correlated Timing and Spectral Variations of the Soft X-Ray Transient Aquila X-1 : Evidence for an Atoll Classification |
title_fullStr |
Correlated Timing and Spectral Variations of the Soft X-Ray Transient Aquila X-1 : Evidence for an Atoll Classification |
title_full_unstemmed |
Correlated Timing and Spectral Variations of the Soft X-Ray Transient Aquila X-1 : Evidence for an Atoll Classification |
title_sort |
Correlated Timing and Spectral Variations of the Soft X-Ray Transient Aquila X-1 : Evidence for an Atoll Classification |
dc.creator.none.fl_str_mv |
Reig, Pablo Méndez, Mariano R. van der Klis, M. Ford, Eric |
author |
Reig, Pablo |
author_facet |
Reig, Pablo Méndez, Mariano R. van der Klis, M. Ford, Eric |
author_role |
author |
author2 |
Méndez, Mariano R. van der Klis, M. Ford, Eric |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
Astronomía Ciencias Astronómicas accretion, accretion disks stars : individual (Aquila X-1) stars : neutron X-rays : stars |
topic |
Astronomía Ciencias Astronómicas accretion, accretion disks stars : individual (Aquila X-1) stars : neutron X-rays : stars |
dc.description.none.fl_txt_mv |
Based on Rossi X-Ray Timing Explorer data, we discuss the classification of the soft X-ray transient Aquila X-1 in the Z/atoll scheme and the relation of its kilohertz quasi-periodic oscillations (kHz QPOs) properties to the X-ray colors. The color-color diagram shows one elongated ("banana") structure and several "islands" of data points. The power spectra of the island are best represented by a broken power law whereas those of the banana by a power law below ~1 Hz plus an exponentially cutoff component at intermediate frequencies (30-60 Hz). The parameters of these two components change in correlation with the position of the source in the color-color diagram. Based on the pattern that the source shows in the color-color diagram and its aperiodic variability, we conclude that Aquila X-1 is an atoll source. We have also investigated the possible correlation between the frequency of the kHz QPOs and the position of the source in the color-color diagram. The complexity seen in the frequency versus count rate diagram is reduced to a single track when the frequency is plotted against hard or soft color. Facultad de Ciencias Astronómicas y Geofísicas |
description |
Based on Rossi X-Ray Timing Explorer data, we discuss the classification of the soft X-ray transient Aquila X-1 in the Z/atoll scheme and the relation of its kilohertz quasi-periodic oscillations (kHz QPOs) properties to the X-ray colors. The color-color diagram shows one elongated ("banana") structure and several "islands" of data points. The power spectra of the island are best represented by a broken power law whereas those of the banana by a power law below ~1 Hz plus an exponentially cutoff component at intermediate frequencies (30-60 Hz). The parameters of these two components change in correlation with the position of the source in the color-color diagram. Based on the pattern that the source shows in the color-color diagram and its aperiodic variability, we conclude that Aquila X-1 is an atoll source. We have also investigated the possible correlation between the frequency of the kHz QPOs and the position of the source in the color-color diagram. The complexity seen in the frequency versus count rate diagram is reduced to a single track when the frequency is plotted against hard or soft color. |
publishDate |
2000 |
dc.date.none.fl_str_mv |
2000-02-20 |
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/10915/127256 |
url |
http://sedici.unlp.edu.ar/handle/10915/127256 |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
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info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) |
eu_rights_str_mv |
openAccess |
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http://creativecommons.org/licenses/by/4.0/ Creative Commons Attribution 4.0 International (CC BY 4.0) |
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