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Article: On the connection between radiative outbursts and timing irregularities in magnetars

TitleOn the connection between radiative outbursts and timing irregularities in magnetars
Authors
Keywordspulsars
general – X-rays
stars – stars
neutron – stars
Magnetar
Issue Date2019
PublisherWiley - V C H Verlag GmbH & Co KGaA. The Journal's web site is located at http://www.wiley-vch.de/home/an
Citation
Astronomische Nachrichten, 2019, v. 340 n. 4, p. 340-345 How to Cite?
AbstractMagnetars are strongly magnetized pulsars and they occasionally show violent radiative outbursts. They also often exhibit glitches that are sudden changes in the spin frequency. It was found that some glitches were associated with outbursts but their connection remains unclear. We present a systematic study to identify possible correlations between them. We find that the glitch size of magnetars likely shows a bimodal distribution, different from the distribution of the Vela‐like recurrent glitches but consistent with the high‐end of that of normal pulsars. A glitch is likely a necessary condition for an outburst but not a sufficient condition because only 30% of glitches were associated with outbursts. In the outburst cases, the glitches tend to induce larger frequency changes compared to those unassociated ones. We argue that a larger glitch is more likely to trigger the outburst mechanism, either by reconfiguration of the magnetosphere or deformation of the crust. A more frequent and deeper monitoring of magnetars is necessary for further investigation of their connection.
Persistent Identifierhttp://hdl.handle.net/10722/271421
ISSN
2017 Impact Factor: 1.322
2015 SCImago Journal Rankings: 0.701

 

DC FieldValueLanguage
dc.contributor.authorHu, CP-
dc.contributor.authorNg, CY-
dc.date.accessioned2019-06-24T01:09:33Z-
dc.date.available2019-06-24T01:09:33Z-
dc.date.issued2019-
dc.identifier.citationAstronomische Nachrichten, 2019, v. 340 n. 4, p. 340-345-
dc.identifier.issn0004-6337-
dc.identifier.urihttp://hdl.handle.net/10722/271421-
dc.description.abstractMagnetars are strongly magnetized pulsars and they occasionally show violent radiative outbursts. They also often exhibit glitches that are sudden changes in the spin frequency. It was found that some glitches were associated with outbursts but their connection remains unclear. We present a systematic study to identify possible correlations between them. We find that the glitch size of magnetars likely shows a bimodal distribution, different from the distribution of the Vela‐like recurrent glitches but consistent with the high‐end of that of normal pulsars. A glitch is likely a necessary condition for an outburst but not a sufficient condition because only 30% of glitches were associated with outbursts. In the outburst cases, the glitches tend to induce larger frequency changes compared to those unassociated ones. We argue that a larger glitch is more likely to trigger the outburst mechanism, either by reconfiguration of the magnetosphere or deformation of the crust. A more frequent and deeper monitoring of magnetars is necessary for further investigation of their connection.-
dc.languageeng-
dc.publisherWiley - V C H Verlag GmbH & Co KGaA. The Journal's web site is located at http://www.wiley-vch.de/home/an-
dc.relation.ispartofAstronomische Nachrichten-
dc.subjectpulsars-
dc.subjectgeneral – X-rays-
dc.subjectstars – stars-
dc.subjectneutron – stars-
dc.subjectMagnetar-
dc.titleOn the connection between radiative outbursts and timing irregularities in magnetars-
dc.typeArticle-
dc.identifier.emailNg, CY: ncy@astro.physics.hku.hk-
dc.identifier.authorityNg, CY=rp01706-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1002/asna.201913621-
dc.identifier.scopuseid_2-s2.0-85063269974-
dc.identifier.hkuros297941-
dc.identifier.volume340-
dc.identifier.issue4-
dc.identifier.spage340-
dc.identifier.epage345-
dc.publisher.placeGermany-

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