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Measurement of the ...
Measurement of the spin of the M87 black hole from its observed twisted light
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- Tamburini, Fabrizio (författare)
- ZKM, Lorenzstr 19, D-76135 Karlsruhe, Germany.
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- Thide, Bo (författare)
- Uppsala universitet,Institutet för rymdfysik, Uppsalaavdelningen
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- Della Valle, Massimo (författare)
- INAF Napoli, Capodimonte Astron Observ, Salita Moiariello 16, I-80131 Naples, Italy.;European Southern Observ, Karl Schwarzschild Str 2, D-85748 Garching, Germany.
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ZKM, Lorenzstr 19, D-76135 Karlsruhe, Germany Institutet för rymdfysik, Uppsalaavdelningen (creator_code:org_t)
- 2019-11-28
- 2020
- Engelska.
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Ingår i: Monthly notices of the Royal Astronomical Society. - : OXFORD UNIV PRESS. - 0035-8711 .- 1365-2966 .- 1745-3925 .- 1745-3933. ; 492:1, s. L22-L27
- Relaterad länk:
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http://arxiv.org/pdf...
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visa fler...
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https://urn.kb.se/re...
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https://doi.org/10.1...
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Abstract
Ämnesord
Stäng
- We present the first observational evidence that light propagating near a rotating black hole is twisted in phase and carries orbital angular momentum (OAM). This physical observable allows a direct measurement of the rotation of the black hole. We extracted the OAM spectra from the radio intensity data collected by the Event Horizon Telescope from around the black hole M87 - by using wavefront reconstruction and phase recovery techniques and from the visibility amplitude and phase maps. This method is robust and complementary to black hole shadow circularity analyses. It shows that the M87 - rotates clockwise with an estimated rotation parameter a = 0.90 +/- 0.05 with an similar to 95 per cent confidence level (c.l.) and an inclination i = 17 degrees +/- 2 degrees, equivalent to a magnetic arrested disc with an inclination i = 163 degrees +/- 2 degrees. From our analysis, we conclude that, within a 6 sigma c.l., the M87* is rotating.
Ämnesord
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Nyckelord
- black hole physics
- gravitational lensing: strong
- methods: data analysis
- methods: numerical
- techniques: image processing
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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