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Article: A systematic study of soft X-ray pulse profiles of magnetars in quiescence
Title | A systematic study of soft X-ray pulse profiles of magnetars in quiescence |
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Authors | |
Keywords | stars: magnetars stars: neutron pulsars: general X-rays: stars |
Issue Date | 2019 |
Publisher | Oxford University press, co-published with Royal Astronomical Society. The Journal's web site is located at http://www.oxfordjournals.org/our_journals/mnras/ |
Citation | Monthly Notices of the Royal Astronomical Society, 2019, v. 485 n. 3, p. 4274-4286 How to Cite? |
Abstract | Magnetars are neutron stars with extremely high surface magnetic fields. They show diverse X-ray pulse profiles in the quiescent state. We perform a systematic Fourier analysis of their soft X-ray pulse profiles. We find that most magnetars have a single-peaked profile and hence have low amplitudes of the second Fourier harmonics (A2). On the other hand, the pulsed fraction (PF) spreads over a wide range. We compared the results with theoretical profiles assuming various surface hotspot asymmetries, viewing geometries, and beaming functions. We found that a single value of the intensity ratio r between two antipodal hotspots is unable to reproduce the observed distribution of A2 and PF for all magnetars. The inferred r is probably anticorrelated with the thermal luminosity, implying that high-luminosity magnetars tend to have two symmetric hotspots. Our results are consistent with theoretical predictions, for which the existence of an evolving toroidal magnetic field breaks the symmetry of the surface temperature. |
Persistent Identifier | http://hdl.handle.net/10722/272945 |
ISSN | 2023 Impact Factor: 4.7 2023 SCImago Journal Rankings: 1.621 |
ISI Accession Number ID |
DC Field | Value | Language |
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dc.contributor.author | Hu, CP | - |
dc.contributor.author | Ng, CY | - |
dc.contributor.author | Ho, WCG | - |
dc.date.accessioned | 2019-08-06T09:19:35Z | - |
dc.date.available | 2019-08-06T09:19:35Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Monthly Notices of the Royal Astronomical Society, 2019, v. 485 n. 3, p. 4274-4286 | - |
dc.identifier.issn | 0035-8711 | - |
dc.identifier.uri | http://hdl.handle.net/10722/272945 | - |
dc.description.abstract | Magnetars are neutron stars with extremely high surface magnetic fields. They show diverse X-ray pulse profiles in the quiescent state. We perform a systematic Fourier analysis of their soft X-ray pulse profiles. We find that most magnetars have a single-peaked profile and hence have low amplitudes of the second Fourier harmonics (A2). On the other hand, the pulsed fraction (PF) spreads over a wide range. We compared the results with theoretical profiles assuming various surface hotspot asymmetries, viewing geometries, and beaming functions. We found that a single value of the intensity ratio r between two antipodal hotspots is unable to reproduce the observed distribution of A2 and PF for all magnetars. The inferred r is probably anticorrelated with the thermal luminosity, implying that high-luminosity magnetars tend to have two symmetric hotspots. Our results are consistent with theoretical predictions, for which the existence of an evolving toroidal magnetic field breaks the symmetry of the surface temperature. | - |
dc.language | eng | - |
dc.publisher | Oxford University press, co-published with Royal Astronomical Society. The Journal's web site is located at http://www.oxfordjournals.org/our_journals/mnras/ | - |
dc.relation.ispartof | Monthly Notices of the Royal Astronomical Society | - |
dc.rights | Monthly Notices of the Royal Astronomical Society. Copyright © Oxford University press, co-published with Royal Astronomical Society. | - |
dc.rights | This article has been accepted for publication in [Monthly Notices of the Royal Astronomical Society] ©: [2019] [CP Hu, CY Ng and WCG Ho] Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. | - |
dc.subject | stars: magnetars | - |
dc.subject | stars: neutron | - |
dc.subject | pulsars: general | - |
dc.subject | X-rays: stars | - |
dc.title | A systematic study of soft X-ray pulse profiles of magnetars in quiescence | - |
dc.type | Article | - |
dc.identifier.email | Ng, CY: ncy@bohr.physics.hku.hk | - |
dc.identifier.authority | Ng, CY=rp01706 | - |
dc.description.nature | published_or_final_version | - |
dc.identifier.doi | 10.1093/mnras/stz513 | - |
dc.identifier.scopus | eid_2-s2.0-85067053739 | - |
dc.identifier.hkuros | 299910 | - |
dc.identifier.volume | 485 | - |
dc.identifier.issue | 3 | - |
dc.identifier.spage | 4274 | - |
dc.identifier.epage | 4286 | - |
dc.identifier.isi | WOS:000474902000097 | - |
dc.publisher.place | United Kingdom | - |
dc.identifier.issnl | 0035-8711 | - |