The University of Southampton
University of Southampton Institutional Repository

Millihertz quasi-periodic oscillations in 4U 1636-53 associated with bursts with positive convexity only

Millihertz quasi-periodic oscillations in 4U 1636-53 associated with bursts with positive convexity only
Millihertz quasi-periodic oscillations in 4U 1636-53 associated with bursts with positive convexity only
We investigated the convexity of all type I X-ray bursts with millihertz quasi-periodic oscillations (mHz QPOs) in 4U 1636?53 using archival observations with the Rossi X-ray Timing Explorer. We found that, at a 3.5? confidence level, in all 39 cases in which the mHz QPOs disappeared at the time of an X-ray burst, the convexity of the burst is positive. The convexity measures the shape of the rising part of the burst light curve and, according to recent models, it is related to the ignition site of bursts on the neutron-star surface. This finding suggests that in 4U 1636-53 these 39 bursts and the marginally stable nuclear burning process responsible for the mHz QPOs take place at the neutron-star equator. This scenario could explain the inconsistency between the high accretion rate required for triggering mHz QPOs in theoretical models and the relatively low accretion rate derived from observations.
0035-8711
2358-2362
Lyu, Ming
6b2e28ac-079d-49f1-baeb-edd2c1b1de68
Méndez, Mariano
5cc6f759-dae2-488a-9cc2-cff89f4eca72
Altamirano, Diego
d5ccdb09-0b71-4303-9538-05b467be075b
Zhang, Guobao
4b081922-0f52-4a4d-8d51-dea291211180
Lyu, Ming
6b2e28ac-079d-49f1-baeb-edd2c1b1de68
Méndez, Mariano
5cc6f759-dae2-488a-9cc2-cff89f4eca72
Altamirano, Diego
d5ccdb09-0b71-4303-9538-05b467be075b
Zhang, Guobao
4b081922-0f52-4a4d-8d51-dea291211180

Lyu, Ming, Méndez, Mariano, Altamirano, Diego and Zhang, Guobao (2016) Millihertz quasi-periodic oscillations in 4U 1636-53 associated with bursts with positive convexity only. Monthly Notices of the Royal Astronomical Society, 463 (3), 2358-2362. (doi:10.1093/mnras/stw2158).

Record type: Article

Abstract

We investigated the convexity of all type I X-ray bursts with millihertz quasi-periodic oscillations (mHz QPOs) in 4U 1636?53 using archival observations with the Rossi X-ray Timing Explorer. We found that, at a 3.5? confidence level, in all 39 cases in which the mHz QPOs disappeared at the time of an X-ray burst, the convexity of the burst is positive. The convexity measures the shape of the rising part of the burst light curve and, according to recent models, it is related to the ignition site of bursts on the neutron-star surface. This finding suggests that in 4U 1636-53 these 39 bursts and the marginally stable nuclear burning process responsible for the mHz QPOs take place at the neutron-star equator. This scenario could explain the inconsistency between the high accretion rate required for triggering mHz QPOs in theoretical models and the relatively low accretion rate derived from observations.

Text
__filestore.soton.ac.uk_users_jao1d15_mydocuments_ePrints_Diego Altamirano 1.pdf - Accepted Manuscript
Download (387kB)

More information

Accepted/In Press date: 24 August 2016
e-pub ahead of print date: 26 August 2016
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 401478
URI: http://eprints.soton.ac.uk/id/eprint/401478
ISSN: 0035-8711
PURE UUID: ea2475fd-9b52-400c-9ef3-9e85d54b87e0
ORCID for Diego Altamirano: ORCID iD orcid.org/0000-0002-3422-0074

Catalogue record

Date deposited: 17 Oct 2016 15:16
Last modified: 10 Dec 2019 01:34

Export record

Altmetrics

Contributors

Author: Ming Lyu
Author: Mariano Méndez
Author: Guobao Zhang

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×