Discovery of a kilohertz quasi-periodic oscillation in 2S 0918‒549
We report the discovery of a kilohertz quasi-periodic oscillation (kHz QPO) in the low-mass X-ray binary (LMXB) 2S 0918-549. The kHz QPO has a frequency of 1156 ± 9 Hz, an FWHM of 70 ± 20 Hz, and a fractional rms amplitude of 18% ± 2%. We also detected for the first time a type I X-ray burst in this...
Autores principales: | , , , , , , , , |
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Formato: | Articulo |
Lenguaje: | Inglés |
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2001
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Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/84707 |
Aporte de: |
id |
I19-R120-10915-84707 |
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record_format |
dspace |
institution |
Universidad Nacional de La Plata |
institution_str |
I-19 |
repository_str |
R-120 |
collection |
SEDICI (UNLP) |
language |
Inglés |
topic |
Ciencias Astronómicas Accretion, accretion disks Binaries: Close Stars: Individual (2S 0918-549) Stars: Neutron Stars: Oscillations X-rays: Stars |
spellingShingle |
Ciencias Astronómicas Accretion, accretion disks Binaries: Close Stars: Individual (2S 0918-549) Stars: Neutron Stars: Oscillations X-rays: Stars Jonker, Peter G. Klis, Michiel van der Homan, Jeroen Méndez, Mariano R. Paradijs, Jan van Belloni, Tomaso Koueliotou, Chryssa Lewin, Walter Ford, Eric C. Discovery of a kilohertz quasi-periodic oscillation in 2S 0918‒549 |
topic_facet |
Ciencias Astronómicas Accretion, accretion disks Binaries: Close Stars: Individual (2S 0918-549) Stars: Neutron Stars: Oscillations X-rays: Stars |
description |
We report the discovery of a kilohertz quasi-periodic oscillation (kHz QPO) in the low-mass X-ray binary (LMXB) 2S 0918-549. The kHz QPO has a frequency of 1156 ± 9 Hz, an FWHM of 70 ± 20 Hz, and a fractional rms amplitude of 18% ± 2%. We also detected for the first time a type I X-ray burst in this source. The compact object must therefore be a neutron star. Finally, we were able to classify the source as an atoll source exhibiting the full complement of spectral/timing states of this class (island and banana). From the peak burst flux, an upper limit on the persistent luminosity can be derived of 0.5% of the Eddington luminosity, making 2S 0918-549 one of the least luminous LMXBs showing a kHz QPO. We compare the fractional rms amplitudes of the upper kHz QPO across the ensemble of LMXBs. We find a strong anticorrelation with luminosity. In LMXBs with luminosities ∼ 100 times lower than those of Z sources, the fractional rms amplitude is a factor ∼ 10 larger. |
format |
Articulo Articulo |
author |
Jonker, Peter G. Klis, Michiel van der Homan, Jeroen Méndez, Mariano R. Paradijs, Jan van Belloni, Tomaso Koueliotou, Chryssa Lewin, Walter Ford, Eric C. |
author_facet |
Jonker, Peter G. Klis, Michiel van der Homan, Jeroen Méndez, Mariano R. Paradijs, Jan van Belloni, Tomaso Koueliotou, Chryssa Lewin, Walter Ford, Eric C. |
author_sort |
Jonker, Peter G. |
title |
Discovery of a kilohertz quasi-periodic oscillation in 2S 0918‒549 |
title_short |
Discovery of a kilohertz quasi-periodic oscillation in 2S 0918‒549 |
title_full |
Discovery of a kilohertz quasi-periodic oscillation in 2S 0918‒549 |
title_fullStr |
Discovery of a kilohertz quasi-periodic oscillation in 2S 0918‒549 |
title_full_unstemmed |
Discovery of a kilohertz quasi-periodic oscillation in 2S 0918‒549 |
title_sort |
discovery of a kilohertz quasi-periodic oscillation in 2s 0918‒549 |
publishDate |
2001 |
url |
http://sedici.unlp.edu.ar/handle/10915/84707 |
work_keys_str_mv |
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bdutipo_str |
Repositorios |
_version_ |
1764820489126019075 |