dc.contributor.author | Fuerst, F. | |
dc.contributor.author | Walton, D. J. | |
dc.contributor.author | Israel, Gian Luca | |
dc.contributor.author | Bachetti, M. | |
dc.contributor.author | Barret, D. | |
dc.contributor.author | Brightman, Murray | |
dc.contributor.author | Earnshaw, H. P. | |
dc.contributor.author | Fabian, A. | |
dc.contributor.author | Heida, M. | |
dc.contributor.author | Imbrogno, M. | |
dc.contributor.author | Middleton, M. J. | |
dc.contributor.author | Pinto, C. | |
dc.contributor.author | Salvaterra, R. | |
dc.contributor.author | Roberts, T. P. | |
dc.contributor.author | Castillo, G. A. Rodríguez | |
dc.contributor.author | Webb, N. | |
dc.date.accessioned | 2023-09-15T09:45:15Z | |
dc.date.available | 2023-09-15T09:45:15Z | |
dc.date.issued | 2023-04-12 | |
dc.identifier.citation | Fuerst , F , Walton , D J , Israel , G L , Bachetti , M , Barret , D , Brightman , M , Earnshaw , H P , Fabian , A , Heida , M , Imbrogno , M , Middleton , M J , Pinto , C , Salvaterra , R , Roberts , T P , Castillo , G A R & Webb , N 2023 , ' Probing the nature of the low state in the extreme ultraluminous X-ray pulsar NGC 5907 ULX1 ' , Astronomy & Astrophysics , vol. 672 , A140 , pp. 1-10 . https://doi.org/10.1051/0004-6361/202245048 | |
dc.identifier.issn | 0004-6361 | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/2302.03425v1 | |
dc.identifier.other | ORCID: /0000-0001-5819-3552/work/142451283 | |
dc.identifier.uri | http://hdl.handle.net/2299/26667 | |
dc.description | © 2023 The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY), https://creativecommons.org/licenses/by/4.0/ | |
dc.description.abstract | NGC 5907 ULX1 is the most luminous ultra-luminous X-ray pulsar (ULXP) known to date, reaching luminosities in excess of 1041 erg s-1. The pulsar is known for its fast spin-up during the on-state. Here, we present a long-term monitoring of the X-ray flux and the pulse period between 2003 and 2022. We find that the source was in an off- or low-state between mid-2017 to mid-2020. During this state, our pulse period monitoring shows that the source had spun down considerably. We interpret this spin-down as likely being due to the propeller effect, whereby accretion onto the neutron star surface is inhibited. Using state-of-the-art accretion and torque models, we use the spin-up and spin-down episodes to constrain the magnetic field. For the spin-up episode, we find solutions for magnetic field strengths of either around 1012 G or 1013 G, however, the strong spin-down during the off-state seems only to be consistent with a very high magnetic field, namely, > 1013 G. This is the first time a strong spin-down is seen during a low flux state in a ULXP. Based on the assumption that the source entered the propeller regime, this gives us the best estimate so far for the magnetic field of NGC 5907 ULX1. | en |
dc.format.extent | 10 | |
dc.format.extent | 333001 | |
dc.language.iso | eng | |
dc.relation.ispartof | Astronomy & Astrophysics | |
dc.subject | astro-ph.HE | |
dc.subject | X-rays: individuals: NGC 5907 ULX1 | |
dc.subject | X-rays: binaries | |
dc.subject | Stars: neutron | |
dc.subject | Magnetic fields | |
dc.subject | Accretion, accretion disks | |
dc.subject | Astronomy and Astrophysics | |
dc.subject | Space and Planetary Science | |
dc.title | Probing the nature of the low state in the extreme ultraluminous X-ray pulsar NGC 5907 ULX1 | en |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.contributor.institution | Department of Physics, Astronomy and Mathematics | |
dc.contributor.institution | School of Physics, Engineering & Computer Science | |
dc.description.status | Peer reviewed | |
dc.identifier.url | http://www.scopus.com/inward/record.url?scp=85153405381&partnerID=8YFLogxK | |
rioxxterms.versionofrecord | 10.1051/0004-6361/202245048 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |