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Discovery of a correlation between the frequency of the mHz quasi-periodic oscillations and the neutron-star temperature in the low-mass X-ray binary 4U 1636–53

Discovery of a correlation between the frequency of the mHz quasi-periodic oscillations and the neutron-star temperature in the low-mass X-ray binary 4U 1636–53
Discovery of a correlation between the frequency of the mHz quasi-periodic oscillations and the neutron-star temperature in the low-mass X-ray binary 4U 1636–53
We detected millihertz quasi-periodic oscillations (QPOs) in an XMM–Newton observation of the neutron-star low-mass X-ray binary 4U 1636-53. These QPOs have been interpreted as marginally stable burning on the neutron-star surface. At the beginning of the observation the QPO was at around 8 mHz, together with a possible second harmonic. About 12 ks into the observation a type I X-ray burst occurred and the QPO disappeared; the QPO reappeared ~25 ks after the burst and it was present until the end of the observation. We divided the observation into four segments to study the evolution of the spectral properties of the source during intervals with and without mHz QPO. We find that the temperature of the neutron-star surface increases from the QPO segment to the non-QPO segment, and vice versa. We also find a strong correlation between the frequency of the mHz QPO and the temperature of a blackbody component in the energy spectrum representing the temperature of neutron-star surface. Our results are consistent with previous results that the frequency of the mHz QPO depends on the variation of the heat flux from the neutron-star crust, and therefore supports the suggestion that the observed QPO frequency drifts could be caused by the cooling of deeper layers.
0035-8711
3659-3668
Lyu, Ming
6b2e28ac-079d-49f1-baeb-edd2c1b1de68
Mendez, Mariano
d28e6a32-ba07-4267-a01c-a349f674b3ad
Altamirano, Diego
d5ccdb09-0b71-4303-9538-05b467be075b
Lyu, Ming
6b2e28ac-079d-49f1-baeb-edd2c1b1de68
Mendez, Mariano
d28e6a32-ba07-4267-a01c-a349f674b3ad
Altamirano, Diego
d5ccdb09-0b71-4303-9538-05b467be075b

Lyu, Ming, Mendez, Mariano and Altamirano, Diego (2014) Discovery of a correlation between the frequency of the mHz quasi-periodic oscillations and the neutron-star temperature in the low-mass X-ray binary 4U 1636–53. Monthly Notices of the Royal Astronomical Society, 445 (4), 3659-3668. (doi:10.1093/mnras/stu1992).

Record type: Article

Abstract

We detected millihertz quasi-periodic oscillations (QPOs) in an XMM–Newton observation of the neutron-star low-mass X-ray binary 4U 1636-53. These QPOs have been interpreted as marginally stable burning on the neutron-star surface. At the beginning of the observation the QPO was at around 8 mHz, together with a possible second harmonic. About 12 ks into the observation a type I X-ray burst occurred and the QPO disappeared; the QPO reappeared ~25 ks after the burst and it was present until the end of the observation. We divided the observation into four segments to study the evolution of the spectral properties of the source during intervals with and without mHz QPO. We find that the temperature of the neutron-star surface increases from the QPO segment to the non-QPO segment, and vice versa. We also find a strong correlation between the frequency of the mHz QPO and the temperature of a blackbody component in the energy spectrum representing the temperature of neutron-star surface. Our results are consistent with previous results that the frequency of the mHz QPO depends on the variation of the heat flux from the neutron-star crust, and therefore supports the suggestion that the observed QPO frequency drifts could be caused by the cooling of deeper layers.

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Accepted/In Press date: 22 September 2014
e-pub ahead of print date: 30 October 2014
Published date: 21 December 2014
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 396180
URI: http://eprints.soton.ac.uk/id/eprint/396180
ISSN: 0035-8711
PURE UUID: e2ab6b93-02b5-4308-854a-7fb3a8761e0f
ORCID for Diego Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

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Date deposited: 02 Jun 2016 14:36
Last modified: 26 Nov 2021 03:02

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Author: Ming Lyu
Author: Mariano Mendez

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