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The harmonic component of the millihertz ouasi-periodic Oscillations in 4U 1636-53

The harmonic component of the millihertz ouasi-periodic Oscillations in 4U 1636-53
The harmonic component of the millihertz ouasi-periodic Oscillations in 4U 1636-53
We studied the harmonics of the millihertz quasi-periodic oscillations (mHz QPOs) in the neutron star low-mass X-ray binary 4U 1636–53 using the Rossi X-ray Timing Explorer observations. We detected the harmonics of the mHz QPOs in 73 data intervals, with most of them in the transitional spectra state. We found that the ratio between the rms amplitude of the harmonic and that of the fundamental remains constant in a wide range of the fundamental frequency. More importantly, we studied, for the first time, the rms amplitude of the harmonics versus energy in 4U 1636–53 in the 2–5 keV range. We found that the rms amplitude of both the harmonic and the fundamental shows a decreasing trend as the energy increases, which is different from the behaviors reported in QPOs in certain black hole systems. Furthermore, our results suggest that not all observations with mHz QPOs have the harmonic component, although the reason behind this is still unclear.
0004-637X
Altamirano, Diego
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Fei, Zhenyan
62f14785-ac4f-45c6-823d-a29c08b2287a
Lyu, Ming
6b2e28ac-079d-49f1-baeb-edd2c1b1de68
Méndez, Mariano
5cc6f759-dae2-488a-9cc2-cff89f4eca72
Zhang, Guobao
4b081922-0f52-4a4d-8d51-dea291211180
Mancuso, G.C.
59acaddd-cafd-4960-ba78-3665c0f30dcb
Xiang, Fu-yuan
87c0d04c-8e18-4e0d-85f5-dffa692dc406
Yang, X.J.
142bfe73-a51d-4380-8aeb-d2cc8d0c5d61
Altamirano, Diego
d5ccdb09-0b71-4303-9538-05b467be075b
Fei, Zhenyan
62f14785-ac4f-45c6-823d-a29c08b2287a
Lyu, Ming
6b2e28ac-079d-49f1-baeb-edd2c1b1de68
Méndez, Mariano
5cc6f759-dae2-488a-9cc2-cff89f4eca72
Zhang, Guobao
4b081922-0f52-4a4d-8d51-dea291211180
Mancuso, G.C.
59acaddd-cafd-4960-ba78-3665c0f30dcb
Xiang, Fu-yuan
87c0d04c-8e18-4e0d-85f5-dffa692dc406
Yang, X.J.
142bfe73-a51d-4380-8aeb-d2cc8d0c5d61

Altamirano, Diego, Fei, Zhenyan, Lyu, Ming, Méndez, Mariano, Zhang, Guobao, Mancuso, G.C., Xiang, Fu-yuan and Yang, X.J. (2021) The harmonic component of the millihertz ouasi-periodic Oscillations in 4U 1636-53. Astrophysical Journal, 922 (2), [119]. (doi:10.3847/1538-4357/ac2501). (In Press)

Record type: Article

Abstract

We studied the harmonics of the millihertz quasi-periodic oscillations (mHz QPOs) in the neutron star low-mass X-ray binary 4U 1636–53 using the Rossi X-ray Timing Explorer observations. We detected the harmonics of the mHz QPOs in 73 data intervals, with most of them in the transitional spectra state. We found that the ratio between the rms amplitude of the harmonic and that of the fundamental remains constant in a wide range of the fundamental frequency. More importantly, we studied, for the first time, the rms amplitude of the harmonics versus energy in 4U 1636–53 in the 2–5 keV range. We found that the rms amplitude of both the harmonic and the fundamental shows a decreasing trend as the energy increases, which is different from the behaviors reported in QPOs in certain black hole systems. Furthermore, our results suggest that not all observations with mHz QPOs have the harmonic component, although the reason behind this is still unclear.

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2109.07686 - Accepted Manuscript
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Accepted/In Press date: 7 September 2021
Additional Information: arXiv:2109.07686

Identifiers

Local EPrints ID: 453204
URI: http://eprints.soton.ac.uk/id/eprint/453204
ISSN: 0004-637X
PURE UUID: 259b1b04-10db-4b3c-b295-c38eefc4696e
ORCID for Diego Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

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Date deposited: 10 Jan 2022 18:41
Last modified: 28 Apr 2022 02:10

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Contributors

Author: Zhenyan Fei
Author: Ming Lyu
Author: Mariano Méndez
Author: Guobao Zhang
Author: G.C. Mancuso
Author: Fu-yuan Xiang
Author: X.J. Yang

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