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First M87 Event Horizon Telescope Results. VI. the Shadow and Mass of the Central Black Hole

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author , Event Horizon Telescope Collaboration
dc.contributor.author Savolainen, Tuomas
dc.date.accessioned 2019-05-06T09:16:43Z
dc.date.available 2019-05-06T09:16:43Z
dc.date.issued 2019-04-10
dc.identifier.citation Event Horizon Telescope Collaboration & Savolainen , T 2019 , ' First M87 Event Horizon Telescope Results. VI. the Shadow and Mass of the Central Black Hole ' , Astrophysical Journal Letters , vol. 875 , no. 1 , 6 . https://doi.org/10.3847/2041-8213/ab1141 en
dc.identifier.issn 2041-8205
dc.identifier.issn 2041-8213
dc.identifier.other PURE UUID: 85eb4966-68c6-4585-a270-cf3aabc93ddc
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/first-m87-event-horizon-telescope-results-vi-the-shadow-and-mass-of-the-central-black-hole(85eb4966-68c6-4585-a270-cf3aabc93ddc).html
dc.identifier.other PURE LINK: http://www.scopus.com/inward/record.url?scp=85064706726&partnerID=8YFLogxK
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/33508389/ELEC_Savolainen_The_Event_Horizon_Telescope_Collaboration_2019_ApJL_875_L6_002_.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/37711
dc.description.abstract We present measurements of the properties of the central radio source in M87 using Event Horizon Telescope data obtained during the 2017 campaign. We develop and fit geometric crescent models (asymmetric rings with interior brightness depressions) using two independent sampling algorithms that consider distinct representations of the visibility data. We show that the crescent family of models is statistically preferred over other comparably complex geometric models that we explore. We calibrate the geometric model parameters using general relativistic magnetohydrodynamic (GRMHD) models of the emission region and estimate physical properties of the source. We further fit images generated from GRMHD models directly to the data. We compare the derived emission region and black hole parameters from these analyses with those recovered from reconstructed images. There is a remarkable consistency among all methods and data sets. We find that >50% of the total flux at arcsecond scales comes from near the horizon, andthat the emission is dramatically suppressed interior to this region by a factor >10, providing direct evidence of the predicted shadow of a black hole. Across all methods, we measure a crescent diameter of 42 ±3 μas and constrain its fractional width to be <0.5. Associating the crescent feature with the emission surrounding the black hole shadow, we infer an angular gravitational radius of GM/Dc 2 =3.8 ±0.4 μas. Folding in a distance measurement of gives a black hole mass of . This measurement from lensed emission near the event horizon is consistent with the presence of a central Kerr black hole, as predicted by the general theory of relativity. 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.subject.other Astronomy and Astrophysics en
dc.subject.other Space and Planetary Science en
dc.subject.other 115 Astronomy and space science en
dc.title First M87 Event Horizon Telescope Results. VI. the Shadow and Mass of the Central Black Hole 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 black hole physics
dc.subject.keyword galaxies: individual (M87)
dc.subject.keyword gravitation
dc.subject.keyword techniques: high angular resolution
dc.subject.keyword techniques: interferometric
dc.subject.keyword Astronomy and Astrophysics
dc.subject.keyword Space and Planetary Science
dc.subject.keyword 115 Astronomy and space science
dc.identifier.urn URN:NBN:fi:aalto-201905062830
dc.identifier.doi 10.3847/2041-8213/ab1141
dc.type.version publishedVersion

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