Discovery of a second kilohertz quasi-periodic oscillation peak in 4U 1608-52

Using a new technique to improve the sensitivity to weak quasi-periodic oscillations (QPOs), we discovered a new QPO peak at about 1100 Hz in the March 1996 outburst observations of 4U 1608-52, simultaneous with the ~600-900 Hz peak previously reported from these data. The frequency separation betwe...

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Detalles Bibliográficos
Autores principales: Méndez, Mariano R., Klis, M. van der, Paradijs, J. van, Lewin, Walter H. G., Vaughan, Brian A., Kuulkers, Erik, Zhang, W. W., Lamb, Frederick K., Psaltis, Dimitrios
Formato: Articulo
Lenguaje:Inglés
Publicado: 1998
Materias:
Astronomía
Física
accretion, accretion disks
stars: neutron
stars: individual (4U 1608252)
X-rays: stars
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/123023
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-123023
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Astronomía
Física
accretion, accretion disks
stars: neutron
stars: individual (4U 1608252)
X-rays: stars
spellingShingle Astronomía
Física
accretion, accretion disks
stars: neutron
stars: individual (4U 1608252)
X-rays: stars
Méndez, Mariano R.
Klis, M. van der
Paradijs, J. van
Lewin, Walter H. G.
Vaughan, Brian A.
Kuulkers, Erik
Zhang, W. W.
Lamb, Frederick K.
Psaltis, Dimitrios
Discovery of a second kilohertz quasi-periodic oscillation peak in 4U 1608-52
topic_facet Astronomía
Física
accretion, accretion disks
stars: neutron
stars: individual (4U 1608252)
X-rays: stars
description Using a new technique to improve the sensitivity to weak quasi-periodic oscillations (QPOs), we discovered a new QPO peak at about 1100 Hz in the March 1996 outburst observations of 4U 1608-52, simultaneous with the ~600-900 Hz peak previously reported from these data. The frequency separation between the upper and the lower QPO peaks varied significantly from 232.7±11.5 Hz on March 3 to 293.1±6.6 Hz on March 6. This is the first case of a variable kilohertz peak separation in an atoll source. We discuss to what extent this result could be accommodated in beat-frequency models such as proposed for the kilohertz QPOs. We measured the rms fractional amplitude of both QPOs as a function of energy, and we found that the relation is steeper for the lower than for the upper frequency peak. This is the first source where such a difference between the energy spectrum of the two kilohertz QPOs could be measured.
format Articulo
Articulo
author Méndez, Mariano R.
Klis, M. van der
Paradijs, J. van
Lewin, Walter H. G.
Vaughan, Brian A.
Kuulkers, Erik
Zhang, W. W.
Lamb, Frederick K.
Psaltis, Dimitrios
author_facet Méndez, Mariano R.
Klis, M. van der
Paradijs, J. van
Lewin, Walter H. G.
Vaughan, Brian A.
Kuulkers, Erik
Zhang, W. W.
Lamb, Frederick K.
Psaltis, Dimitrios
author_sort Méndez, Mariano R.
title Discovery of a second kilohertz quasi-periodic oscillation peak in 4U 1608-52
title_short Discovery of a second kilohertz quasi-periodic oscillation peak in 4U 1608-52
title_full Discovery of a second kilohertz quasi-periodic oscillation peak in 4U 1608-52
title_fullStr Discovery of a second kilohertz quasi-periodic oscillation peak in 4U 1608-52
title_full_unstemmed Discovery of a second kilohertz quasi-periodic oscillation peak in 4U 1608-52
title_sort discovery of a second kilohertz quasi-periodic oscillation peak in 4u 1608-52
publishDate 1998
url http://sedici.unlp.edu.ar/handle/10915/123023
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bdutipo_str Repositorios
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