Simultaneous Measurements of X-Ray Luminosity and Kilohertz Quasi-Periodic Oscillations in Low-Mass X-Ray Binaries

We measure simultaneously the properties of the energy spectra and the frequencies of the kilohertz quasi-periodic oscillations (QPOs) in fifteen low mass X-ray binaries covering a wide range of X-ray luminosities. In each source the QPO frequencies cover the same range of approximately 300 Hz to 13...

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Autores principales:	Ford, Eric, van der Klis, Michiel, Méndez, Mariano R., Wijnands, Rudy, Homan, Jeroen, Jonker, Peter G., van Paradijs, Jan
Formato:	Articulo Preprint
Lenguaje:	Inglés
Publicado:	2000
Materias:	Ciencias Astronómicas Accretion Accretion disks Black holes Stars: neutron X–rays: stars
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/128051
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-128051
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 Black holes Stars: neutron X–rays: stars
spellingShingle	Ciencias Astronómicas Accretion Accretion disks Black holes Stars: neutron X–rays: stars Ford, Eric van der Klis, Michiel Méndez, Mariano R. Wijnands, Rudy Homan, Jeroen Jonker, Peter G. van Paradijs, Jan Simultaneous Measurements of X-Ray Luminosity and Kilohertz Quasi-Periodic Oscillations in Low-Mass X-Ray Binaries
topic_facet	Ciencias Astronómicas Accretion Accretion disks Black holes Stars: neutron X–rays: stars
description	We measure simultaneously the properties of the energy spectra and the frequencies of the kilohertz quasi-periodic oscillations (QPOs) in fifteen low mass X-ray binaries covering a wide range of X-ray luminosities. In each source the QPO frequencies cover the same range of approximately 300 Hz to 1300 Hz, though the sources differ by two orders of magnitude in their X-ray luminosities (as measured from the unabsorbed 2-50 keV flux). So the X-ray luminosity does not uniquely determine the QPO frequency. This is difficult to understand since the evidence from individual sources indicates that the frequency and luminosity are very well correlated at least over short timescales. Perhaps beaming effects or bolometric corrections change the observed luminosities, or perhaps part of the energy in mass accretion is used to power outflows reducing the energy emitted in X-rays. It is also possible that the parameters of a QPO model are tuned in such a way that the same range of frequencies appears in all sources. Different modes of accretion may be involved for example (disk and radial) or multiple parameters may conspire to yield the same frequencies.
format	Articulo Preprint
author	Ford, Eric van der Klis, Michiel Méndez, Mariano R. Wijnands, Rudy Homan, Jeroen Jonker, Peter G. van Paradijs, Jan
author_facet	Ford, Eric van der Klis, Michiel Méndez, Mariano R. Wijnands, Rudy Homan, Jeroen Jonker, Peter G. van Paradijs, Jan
author_sort	Ford, Eric
title	Simultaneous Measurements of X-Ray Luminosity and Kilohertz Quasi-Periodic Oscillations in Low-Mass X-Ray Binaries
title_short	Simultaneous Measurements of X-Ray Luminosity and Kilohertz Quasi-Periodic Oscillations in Low-Mass X-Ray Binaries
title_full	Simultaneous Measurements of X-Ray Luminosity and Kilohertz Quasi-Periodic Oscillations in Low-Mass X-Ray Binaries
title_fullStr	Simultaneous Measurements of X-Ray Luminosity and Kilohertz Quasi-Periodic Oscillations in Low-Mass X-Ray Binaries
title_full_unstemmed	Simultaneous Measurements of X-Ray Luminosity and Kilohertz Quasi-Periodic Oscillations in Low-Mass X-Ray Binaries
title_sort	simultaneous measurements of x-ray luminosity and kilohertz quasi-periodic oscillations in low-mass x-ray binaries
publishDate	2000
url	http://sedici.unlp.edu.ar/handle/10915/128051
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bdutipo_str	Repositorios
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Simultaneous Measurements of X-Ray Luminosity and Kilohertz Quasi-Periodic Oscillations in Low-Mass X-Ray Binaries

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