Correlated Timing and Spectral Variations of the Soft X-Ray Transient Aquila X-1 : Evidence for an Atoll Classification
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&quo...
| Autores principales: | , , , |
|---|---|
| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
2000
|
| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/127256 https://iopscience.iop.org/article/10.1086/308399 |
| Aporte de: |
| id |
I19-R120-10915-127256 |
|---|---|
| record_format |
dspace |
| institution |
Universidad Nacional de La Plata |
| institution_str |
I-19 |
| repository_str |
R-120 |
| collection |
SEDICI (UNLP) |
| language |
Inglés |
| topic |
Astronomía Ciencias Astronómicas accretion, accretion disks stars : individual (Aquila X-1) stars : neutron X-rays : stars |
| spellingShingle |
Astronomía Ciencias Astronómicas accretion, accretion disks stars : individual (Aquila X-1) stars : neutron X-rays : stars Reig, Pablo Méndez, Mariano R. van der Klis, M. Ford, Eric Correlated Timing and Spectral Variations of the Soft X-Ray Transient Aquila X-1 : Evidence for an Atoll Classification |
| topic_facet |
Astronomía Ciencias Astronómicas accretion, accretion disks stars : individual (Aquila X-1) stars : neutron X-rays : stars |
| 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. |
| format |
Articulo Articulo |
| author |
Reig, Pablo Méndez, Mariano R. van der Klis, M. Ford, Eric |
| author_facet |
Reig, Pablo Méndez, Mariano R. van der Klis, M. Ford, Eric |
| author_sort |
Reig, Pablo |
| title |
Correlated Timing and Spectral Variations of the Soft X-Ray Transient Aquila X-1 : Evidence for an Atoll Classification |
| 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 |
| publishDate |
2000 |
| url |
http://sedici.unlp.edu.ar/handle/10915/127256 https://iopscience.iop.org/article/10.1086/308399 |
| work_keys_str_mv |
AT reigpablo correlatedtimingandspectralvariationsofthesoftxraytransientaquilax1evidenceforanatollclassification AT mendezmarianor correlatedtimingandspectralvariationsofthesoftxraytransientaquilax1evidenceforanatollclassification AT vanderklism correlatedtimingandspectralvariationsofthesoftxraytransientaquilax1evidenceforanatollclassification AT forderic correlatedtimingandspectralvariationsofthesoftxraytransientaquilax1evidenceforanatollclassification |
| bdutipo_str |
Repositorios |
| _version_ |
1764820451513597952 |