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Discovery of an accretion-rate Independent absolute RMS amplitude of millihertz quasi-periodic oscillations in 4U 1636-53

Discovery of an accretion-rate Independent absolute RMS amplitude of millihertz quasi-periodic oscillations in 4U 1636-53
Discovery of an accretion-rate Independent absolute RMS amplitude of millihertz quasi-periodic oscillations in 4U 1636-53
We investigate the frequency and amplitude of the millihertz quasi-periodic oscillations (mHz QPOs) in the neutron-star low-mass X-ray binary 4U 1636–53 using Rossi X-ray Timing Explorer observations. We find that no mHz QPOs appear when the source is in the hard spectral state. We also find that there is no significant correlation between the frequency and the fractional RMS amplitude of the mHz QPOs. Notwithstanding, for the first time, we find that the absolute rms amplitude of the mHz QPOs is insensitive to the parameter S a , which measures the position of the source in the color–color diagram and is usually assumed to be an increasing function of mass accretion rate. This finding indicates that the transition from marginally stable burning to stable burning or unstable burning could happen very rapidly since, before the transition, the mHz QPOs do not gradually decay as the rate further changes.
0004-637X
Lyu, Ming
6b2e28ac-079d-49f1-baeb-edd2c1b1de68
Mendez, Mariano
d28e6a32-ba07-4267-a01c-a349f674b3ad
Altamirano, Diego
d5ccdb09-0b71-4303-9538-05b467be075b
Zhang, Guobao
4b081922-0f52-4a4d-8d51-dea291211180
Mancuso, G.C.
59acaddd-cafd-4960-ba78-3665c0f30dcb
Lyu, Ming
6b2e28ac-079d-49f1-baeb-edd2c1b1de68
Mendez, Mariano
d28e6a32-ba07-4267-a01c-a349f674b3ad
Altamirano, Diego
d5ccdb09-0b71-4303-9538-05b467be075b
Zhang, Guobao
4b081922-0f52-4a4d-8d51-dea291211180
Mancuso, G.C.
59acaddd-cafd-4960-ba78-3665c0f30dcb

Lyu, Ming, Mendez, Mariano, Altamirano, Diego, Zhang, Guobao and Mancuso, G.C. (2019) Discovery of an accretion-rate Independent absolute RMS amplitude of millihertz quasi-periodic oscillations in 4U 1636-53. The Astrophysical Journal, 855 (1), [5]. (doi:10.3847/1538-4357/ab44a6). (In Press)

Record type: Article

Abstract

We investigate the frequency and amplitude of the millihertz quasi-periodic oscillations (mHz QPOs) in the neutron-star low-mass X-ray binary 4U 1636–53 using Rossi X-ray Timing Explorer observations. We find that no mHz QPOs appear when the source is in the hard spectral state. We also find that there is no significant correlation between the frequency and the fractional RMS amplitude of the mHz QPOs. Notwithstanding, for the first time, we find that the absolute rms amplitude of the mHz QPOs is insensitive to the parameter S a , which measures the position of the source in the color–color diagram and is usually assumed to be an increasing function of mass accretion rate. This finding indicates that the transition from marginally stable burning to stable burning or unstable burning could happen very rapidly since, before the transition, the mHz QPOs do not gradually decay as the rate further changes.

Text
Discovery of an Accretion-rate Independent Absolute RMS Amplitude of Millihertz Quasi-periodic Oscillations in 4U 1636-53 - Accepted Manuscript
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Accepted/In Press date: 12 September 2019

Identifiers

Local EPrints ID: 436453
URI: http://eprints.soton.ac.uk/id/eprint/436453
ISSN: 0004-637X
PURE UUID: 9781151a-c62b-49fa-86f8-720d4a7e792d
ORCID for Diego Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

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Date deposited: 11 Dec 2019 17:30
Last modified: 26 Nov 2021 03:02

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Contributors

Author: Ming Lyu
Author: Mariano Mendez
Author: Guobao Zhang
Author: G.C. Mancuso

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