Discovery of millihertz quasi-periodic oscillations in the X-ray binary EXO 0748−676

We report the discovery of millihertz quasi-periodic oscillations (mHz QPOs) from the bursting, high-inclination atoll neutron star low-mass X-ray binary (NS LMXB) EXO 0748-676 with the Rossi X-ray Time Explorer (RXTE). This class of QPO, originally discovered in three NS LMXBs, has been interpreted...

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Detalles Bibliográficos
Autores principales:	Mancuso, Giulio Cesare, Altamirano, Diego, García, Federico, Lyu, Ming, Méndez, Mariano R., Combi, Jorge Ariel, Díaz Trigo, M., Zand, Jean J. M. in't
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2019
Materias:	Astronomía accretion, accretion discs stars: individual: EXO 0748−676 stars: neutron X-rays: binaries
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/125605
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-125605
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Astronomía accretion, accretion discs stars: individual: EXO 0748−676 stars: neutron X-rays: binaries
spellingShingle	Astronomía accretion, accretion discs stars: individual: EXO 0748−676 stars: neutron X-rays: binaries Mancuso, Giulio Cesare Altamirano, Diego García, Federico Lyu, Ming Méndez, Mariano R. Combi, Jorge Ariel Díaz Trigo, M. Zand, Jean J. M. in't Discovery of millihertz quasi-periodic oscillations in the X-ray binary EXO 0748−676
topic_facet	Astronomía accretion, accretion discs stars: individual: EXO 0748−676 stars: neutron X-rays: binaries
description	We report the discovery of millihertz quasi-periodic oscillations (mHz QPOs) from the bursting, high-inclination atoll neutron star low-mass X-ray binary (NS LMXB) EXO 0748-676 with the Rossi X-ray Time Explorer (RXTE). This class of QPO, originally discovered in three NS LMXBs, has been interpreted as a consequence of a special mode of nuclear burning on the NS surface. Using all the RXTE archival observations of the source, we detected significant (>3σ) mHz QPOs in 11 observations. The frequency of the oscillations was between ∼5 and ∼13 mHz. We also found a decrease of the QPO frequency with time in two occasions; in one of these the oscillations disappeared with the onset of an X-ray burst, similar to what was reported in other sources. Our analysis of the X-ray colours revealed that EXO 0748-676 was in a soft spectral state when it exhibited the QPOs. This makes EXO 0748-676 the sixth source with mHz oscillations associated with marginally stable burning, and the second one that shows a systematic frequency drift. Our results suggest that the mechanism that produces the drift might always be present if the mHz QPOs are observed in the so-called intermediate state.
format	Articulo Articulo
author	Mancuso, Giulio Cesare Altamirano, Diego García, Federico Lyu, Ming Méndez, Mariano R. Combi, Jorge Ariel Díaz Trigo, M. Zand, Jean J. M. in't
author_facet	Mancuso, Giulio Cesare Altamirano, Diego García, Federico Lyu, Ming Méndez, Mariano R. Combi, Jorge Ariel Díaz Trigo, M. Zand, Jean J. M. in't
author_sort	Mancuso, Giulio Cesare
title	Discovery of millihertz quasi-periodic oscillations in the X-ray binary EXO 0748−676
title_short	Discovery of millihertz quasi-periodic oscillations in the X-ray binary EXO 0748−676
title_full	Discovery of millihertz quasi-periodic oscillations in the X-ray binary EXO 0748−676
title_fullStr	Discovery of millihertz quasi-periodic oscillations in the X-ray binary EXO 0748−676
title_full_unstemmed	Discovery of millihertz quasi-periodic oscillations in the X-ray binary EXO 0748−676
title_sort	discovery of millihertz quasi-periodic oscillations in the x-ray binary exo 0748−676
publishDate	2019
url	http://sedici.unlp.edu.ar/handle/10915/125605
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bdutipo_str	Repositorios
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Discovery of millihertz quasi-periodic oscillations in the X-ray binary EXO 0748−676

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