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First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Savolainen, Tuomas
dc.contributor.author , Event Horizon Telescope Collaborat
dc.date.accessioned 2019-05-06T09:22:40Z
dc.date.available 2019-05-06T09:22:40Z
dc.date.issued 2019-04-10
dc.identifier.citation Savolainen , T & Event Horizon Telescope Collaboration 2019 , ' First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring ' , Astrophysical Journal Letters , vol. 875 , no. 1 , 5 . https://doi.org/10.3847/2041-8213/ab0f43 en
dc.identifier.issn 2041-8205
dc.identifier.issn 2041-8213
dc.identifier.other PURE UUID: bfa68734-84c7-414d-92c5-35e896637417
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/bfa68734-84c7-414d-92c5-35e896637417
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=85064463510&partnerID=8YFLogxK
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/33462542/ELEC_Savolainen_The_Event_Horizon_Telescope_Collaboration_2019_ApJL_875_L5.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/37763
dc.description.abstract The Event Horizon Telescope (EHT) has mapped the central compact radio source of the elliptical galaxy M87 at 1.3 mm with unprecedented angular resolution. Here we consider the physical implications of the asymmetric ring seen in the 2017 EHT data. To this end, we construct a large library of models based on general relativistic magnetohydrodynamic (GRMHD) simulations and synthetic images produced by general relativistic ray tracing. We compare the observed visibilities with this library and confirm that the asymmetric ring is consistent with earlier predictions of strong gravitational lensing of synchrotron emission from a hot plasma orbiting near the black hole event horizon. The ring radius and ring asymmetry depend on black hole mass and spin, respectively, and both are therefore expected to be stable when observed in future EHT campaigns. Overall, the observed image is consistent with expectations for the shadow of a spinning Kerr black hole as predicted by general relativity. If the black hole spin and M87's large scale jet are aligned, then the black hole spin vector is pointed away from Earth. Models in our library of non-spinning black holes are inconsistent with the observations as they do not produce sufficiently powerful jets. At the same time, in those models that produce a sufficiently powerful jet, the latter is powered by extraction of black hole spin energy through mechanisms akin to the Blandford-Znajek process. We briefly consider alternatives to a black hole for the central compact object. Analysis of existing EHT polarization data and data taken simultaneously at other wavelengths will soon enable new tests of the GRMHD models, as will future EHT campaigns at 230 and 345 GHz. en
dc.format.mimetype application/pdf
dc.language.iso en en
dc.publisher IOP Publishing Ltd.
dc.relation.ispartofseries Astrophysical Journal Letters en
dc.relation.ispartofseries Volume 875, issue 1 en
dc.rights openAccess en
dc.title First M87 Event Horizon Telescope Results. V. Physical Origin of the Asymmetric Ring en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Anne Lähteenmäki Group
dc.contributor.department Department of Electronics and Nanoengineering en
dc.subject.keyword accretion, accretion disks
dc.subject.keyword black hole physics
dc.subject.keyword galaxies: individual (M87)
dc.subject.keyword galaxies: jets
dc.subject.keyword magnetohydrodynamics (MHD)
dc.subject.keyword techniques: high angular resolution
dc.identifier.urn URN:NBN:fi:aalto-201905062881
dc.identifier.doi 10.3847/2041-8213/ab0f43
dc.type.version publishedVersion

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