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Photon sphere: Revision history


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  • curprev 23:5523:55, 10 August 2023Georgelazenby talk contribs 13,696 bytes +2,360 The EHT image of M87* does not show an accretion disc. The microwave range in which the EHT is sensitive does not easily show the thermal emissions that dominate the spectra of an accretion disc. Rather, the EHT is sensitive to the synchrotron radiation given off by electrons caught in the plasma vortex whipped up by M87*'s rotation. Those microwave photons are then caught in M87*'s photon sphere, their anisotropic escape from which creates the ring. Adjusted sources accordingly undo Tag: Visual edit

19 July 2023

  • curprev 17:3517:35, 19 July 20232601:155:3:46c0:910c:d734:dba4:47bf talk 11,336 bytes +295 Added a link to the relevant type of orbit, and removed "other angles", because it's not correct to say that two photon spheres do not exist at ALL other angles. An inclined orbit would still see two different photon spheres, but they would be closer together depending on the inclination. The orbit would still be affected though. A rotating black hole should cause a polar orbit to process. undo Tags: Mobile edit Mobile web edit

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