Discovery of a Second Kilohertz QPO in the X-Ray Binary 4U 1735–44

In recent observations with the Rossi X–Ray Timing Explorer we have detected two simultaneous quasi-periodic oscillation (QPO) peaks in the low mass X–ray binary and atoll source 4U 1735–44. The lower and higher frequency QPOs have frequencies varying between 632 and 729 Hz, and 982 and 1026 Hz, res...

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Autores principales: Ford, Eric, van der Klis, Michiel, van Paradijs, Jan, Méndez, Mariano R., Wijnands, Rudy, Kaaret, Philip
Formato: Articulo Preprint
Lenguaje:Inglés
Publicado: 1998
Materias:
Ciencias Exactas
Ciencias Astronómicas
Accretion disks
Black holes
stars: individual (4U 1735-44)
stars: neutron
X–rays: stars
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/123157
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-123157
record_format dspace
institution Universidad Nacional de La Plata
institution_str I-19
repository_str R-120
collection SEDICI (UNLP)
language Inglés
topic Ciencias Exactas
Ciencias Astronómicas
Accretion disks
Black holes
stars: individual (4U 1735-44)
stars: neutron
X–rays: stars
spellingShingle Ciencias Exactas
Ciencias Astronómicas
Accretion disks
Black holes
stars: individual (4U 1735-44)
stars: neutron
X–rays: stars
Ford, Eric
van der Klis, Michiel
van Paradijs, Jan
Méndez, Mariano R.
Wijnands, Rudy
Kaaret, Philip
Discovery of a Second Kilohertz QPO in the X-Ray Binary 4U 1735–44
topic_facet Ciencias Exactas
Ciencias Astronómicas
Accretion disks
Black holes
stars: individual (4U 1735-44)
stars: neutron
X–rays: stars
description In recent observations with the Rossi X–Ray Timing Explorer we have detected two simultaneous quasi-periodic oscillation (QPO) peaks in the low mass X–ray binary and atoll source 4U 1735–44. The lower and higher frequency QPOs have frequencies varying between 632 and 729 Hz, and 982 and 1026 Hz, respectively. The fractional rms amplitudes are 3.7 to 8.1% and 5.0 to 5.8%. The frequency separation between the two QPOs changes from 341±7 Hz to 296±12 Hz. The inferred mass accretion rate during our observations is relatively low compared to that during the previous observations, where only a single QPO was present. There is weak evidence that the frequency of the QPOs correlates with the mass accretion rate, as observed in other binaries. Five X–ray bursts were recorded with no detectable oscillations with upper limits for the rms fraction of 4% to 13%.
format Articulo
Preprint
author Ford, Eric
van der Klis, Michiel
van Paradijs, Jan
Méndez, Mariano R.
Wijnands, Rudy
Kaaret, Philip
author_facet Ford, Eric
van der Klis, Michiel
van Paradijs, Jan
Méndez, Mariano R.
Wijnands, Rudy
Kaaret, Philip
author_sort Ford, Eric
title Discovery of a Second Kilohertz QPO in the X-Ray Binary 4U 1735–44
title_short Discovery of a Second Kilohertz QPO in the X-Ray Binary 4U 1735–44
title_full Discovery of a Second Kilohertz QPO in the X-Ray Binary 4U 1735–44
title_fullStr Discovery of a Second Kilohertz QPO in the X-Ray Binary 4U 1735–44
title_full_unstemmed Discovery of a Second Kilohertz QPO in the X-Ray Binary 4U 1735–44
title_sort discovery of a second kilohertz qpo in the x-ray binary 4u 1735–44
publishDate 1998
url http://sedici.unlp.edu.ar/handle/10915/123157
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