dc.contributor.author | Brightman, Murray | |
dc.contributor.author | Kosec, Peter | |
dc.contributor.author | Fürst, Felix | |
dc.contributor.author | Earnshaw, Hannah | |
dc.contributor.author | Heida, Marianne | |
dc.contributor.author | Middleton, Matthew J | |
dc.contributor.author | Stern, Daniel | |
dc.contributor.author | Walton, Dominic J | |
dc.date.accessioned | 2022-07-13T12:45:02Z | |
dc.date.available | 2022-07-13T12:45:02Z | |
dc.date.issued | 2022-04-21 | |
dc.identifier.citation | Brightman , M , Kosec , P , Fürst , F , Earnshaw , H , Heida , M , Middleton , M J , Stern , D & Walton , D J 2022 , ' An 8.56 keV absorption line in the hyperluminous X-ray source in NGC 4045: Ultra-fast outflow or cyclotron line? ' , The Astrophysical Journal , vol. 929 , no. 2 . https://doi.org/10.3847/1538-4357/ac5e37 | |
dc.identifier.issn | 0004-637X | |
dc.identifier.other | ArXiv: http://arxiv.org/abs/2203.11955v1 | |
dc.identifier.other | ORCID: /0000-0001-5819-3552/work/128033195 | |
dc.identifier.uri | http://hdl.handle.net/2299/25622 | |
dc.description | © 2022. The Author(s). Published by the American Astronomical Society. This is an open access article distributed under the Creative Commons Attribution License, to view a copy of the license, see: https://creativecommons.org/licenses/by/4.0/ | |
dc.description.abstract | We report on the discovery of an absorption line at $E=8.56^{+0.05}_{-0.11}$ keV detected with a significance of $>3.3\sigma$ in the NuSTAR and XMM-Newton spectra of a newly discovered hyperluminous X-ray source (HLX, $L_{\rm X}>10^{41}$ ergs$^{-1}$) in the galaxy NGC 4045 at a distance of 32 Mpc. The source was first discovered serendipitously in a Swift/XRT observation of the galaxy, and Swift monitoring reveals a highly variable source changing by over an order of magnitude from maximum to minimum. The origin of the absorption line appears likely to be by highly ionized iron with a blue shift of 0.19$c$, indicating an ultrafast outflow (UFO). However, the large equivalent width of the line (EW$=-0.22^{+0.08}_{-0.09}$ keV) paired with the lack of other absorption lines detected are difficult to reconcile with models. An alternative explanation is that the line is due to a cyclotron resonance scattering feature (CRSF), produced by the interaction of X-ray photons with the powerful magnetic field of a neutron star. | en |
dc.format.extent | 9 | |
dc.format.extent | 963348 | |
dc.language.iso | eng | |
dc.relation.ispartof | The Astrophysical Journal | |
dc.subject | astro-ph.HE | |
dc.title | An 8.56 keV absorption line in the hyperluminous X-ray source in NGC 4045: Ultra-fast outflow or cyclotron line? | en |
dc.contributor.institution | School of Physics, Engineering & Computer Science | |
dc.contributor.institution | Centre for Astrophysics Research (CAR) | |
dc.contributor.institution | Department of Physics, Astronomy and Mathematics | |
dc.description.status | Peer reviewed | |
rioxxterms.versionofrecord | 10.3847/1538-4357/ac5e37 | |
rioxxterms.type | Journal Article/Review | |
herts.preservation.rarelyaccessed | true | |