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XMM-Newton and NICER measurement of the Rms spectrum of the millihertz quasiperiodic oscillations in the neutron-star low-mass X-ray binary 4U 1636–53

XMM-Newton and NICER measurement of the Rms spectrum of the millihertz quasiperiodic oscillations in the neutron-star low-mass X-ray binary 4U 1636–53
XMM-Newton and NICER measurement of the Rms spectrum of the millihertz quasiperiodic oscillations in the neutron-star low-mass X-ray binary 4U 1636–53
We used two XMM-Newton and six Neutron Star Interior Composition Explorer observations to investigate the fractional rms amplitude of the millihertz quasiperiodic oscillations (mHz QPOs) in the neutron-star low-mass X-ray binary 4U 1636–53. We studied, for the first time, the fractional rms amplitude of the mHz QPOs versus energy in 4U 1636–53 down to 0.2 keV. We find that, as the energy increases from ~0.2 to ~3 keV, the rms amplitude of the mHz QPOs increases, different from the decreasing trend that has been previously observed above 3 keV. This finding has not yet been predicted by any current theoretical model; however, it provides an important observational feature to speculate whether a newly discovered mHz oscillation originates from the marginally stable nuclear burning process on the neutron-star surface.
0004-637X
Lyu, Ming
6b2e28ac-079d-49f1-baeb-edd2c1b1de68
Zhang, Guobao
4b081922-0f52-4a4d-8d51-dea291211180
Méndez, Mariano
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Altamirano, D.
d5ccdb09-0b71-4303-9538-05b467be075b
Mancuso, G. C.
59acaddd-cafd-4960-ba78-3665c0f30dcb
Xiang, Fu-yuan
87c0d04c-8e18-4e0d-85f5-dffa692dc406
Xiao, Huaping
dc6127d8-59a9-4194-98d3-814c2209c4e8
Lyu, Ming
6b2e28ac-079d-49f1-baeb-edd2c1b1de68
Zhang, Guobao
4b081922-0f52-4a4d-8d51-dea291211180
Méndez, Mariano
5cc6f759-dae2-488a-9cc2-cff89f4eca72
Altamirano, D.
d5ccdb09-0b71-4303-9538-05b467be075b
Mancuso, G. C.
59acaddd-cafd-4960-ba78-3665c0f30dcb
Xiang, Fu-yuan
87c0d04c-8e18-4e0d-85f5-dffa692dc406
Xiao, Huaping
dc6127d8-59a9-4194-98d3-814c2209c4e8

Lyu, Ming, Zhang, Guobao, Méndez, Mariano, Altamirano, D., Mancuso, G. C., Xiang, Fu-yuan and Xiao, Huaping (2020) XMM-Newton and NICER measurement of the Rms spectrum of the millihertz quasiperiodic oscillations in the neutron-star low-mass X-ray binary 4U 1636–53. The Astrophysical Journal, 895 (2), [120]. (doi:10.3847/1538-4357/ab8cbe).

Record type: Article

Abstract

We used two XMM-Newton and six Neutron Star Interior Composition Explorer observations to investigate the fractional rms amplitude of the millihertz quasiperiodic oscillations (mHz QPOs) in the neutron-star low-mass X-ray binary 4U 1636–53. We studied, for the first time, the fractional rms amplitude of the mHz QPOs versus energy in 4U 1636–53 down to 0.2 keV. We find that, as the energy increases from ~0.2 to ~3 keV, the rms amplitude of the mHz QPOs increases, different from the decreasing trend that has been previously observed above 3 keV. This finding has not yet been predicted by any current theoretical model; however, it provides an important observational feature to speculate whether a newly discovered mHz oscillation originates from the marginally stable nuclear burning process on the neutron-star surface.

Text
2006.09563 - Accepted Manuscript
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e-pub ahead of print date: 3 June 2020

Identifiers

Local EPrints ID: 442309
URI: http://eprints.soton.ac.uk/id/eprint/442309
ISSN: 0004-637X
PURE UUID: e0b63cdf-745c-4e9d-b3f5-eea478e0c5b8
ORCID for D. Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

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Date deposited: 13 Jul 2020 16:30
Last modified: 18 Feb 2021 17:23

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Contributors

Author: Ming Lyu
Author: Guobao Zhang
Author: Mariano Méndez
Author: D. Altamirano ORCID iD
Author: G. C. Mancuso
Author: Fu-yuan Xiang
Author: Huaping Xiao

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