This article is within the scope of WikiProject Physics, a collaborative effort to improve the coverage of
Physics on Wikipedia. If you would like to participate, please visit the project page, where you can join
the discussion and see a list of open tasks.PhysicsWikipedia:WikiProject PhysicsTemplate:WikiProject Physicsphysics articles
This article is within the scope of WikiProject Astronomy, which collaborates on articles related to
Astronomy on Wikipedia.AstronomyWikipedia:WikiProject AstronomyTemplate:WikiProject AstronomyAstronomy articles
The mri was actually discovered by Velikhov and Chandrashekar (see mri main article). Perhaps the work of Alfvén is related but the specific mechanism for angular momentum transport is linked directly to the mri. A precise reference to the work of Alfven should be given in any case.
Repepo
Why is this picture present?
"NASA artist's misinformed concept of corona over black hole that is (wrongly) shown to hide part of the disk (as would a material body in flat space)"
Removed 'misinformed' from the caption as this seems to be a personal opinion not confirmed by the sources, if we can establish that the image is incorrect it should be removed. --
184.161.106.203 (
talk)
11:24, 18 February 2016 (UTC)reply
I'm glad the pic is here for comparison purposes, it is really common for artists to render the black hole like that but the picture is indeed incorrect (the caption is correct). Further out the accretion disk looks like that, but the part that is behind the sphere (black hole) from your point of view is warped so that you can see the entire disc that is normally hidden behind the black hole. This picture in the article is what it would actually look like up close with a small accretion disc:
/info/en/?search=Accretion_disk#/media/File:CNRSblackhole.jpg If you want to know more, go here
http://rantonels.github.io/starless/ or google "ray tracing a black hole" to see how light behaves around a singularity. Also
http://casa.colorado.edu/~ajsh/approach.html It's really interesting! You can also see the entire surface of the singularity from any perspective at any time (with no debris in the way of course)
162.219.204.36 (
talk)
13:37, 13 July 2016 (UTC)reply
The source [27] does not state the painting is "wrongly" drawn. The examples you show are for a much smaller disk. Note that the accretion disk in the painting is much wider. What the caption should say is either the radius of the disk is wrongly depicted, or the "wrongly" statement should be removed, as it is WP:SYNTH. And we can never see the "surface" of a singularity - did you mean the event horizon?
104.169.29.171 (
talk)
13:47, 14 April 2019 (UTC)reply
It seems important to add the image recently produced by the Event Horizon Telescope to the article. The image clearly shows the shape of the M87 accretion disk and would add an important visualization to the article, which currently only shows artist conceptions. — Preceding
unsigned comment added by
98.116.248.42 (
talk)
16:11, 11 April 2019 (UTC)reply
Actually, it shows an image transformed from the non-visible radio-wave spectrum being emitted by the disk into something the human eye can relate to - it isn't a photograph of the accrection disk.
104.169.29.171 (
talk)
13:41, 14 April 2019 (UTC)reply
M87 Image
My understanding is the the M87 image is not the accretion disk, but is mroe related to effects in the photon sphere and the ergosphere inside the accretion disk.
Stevelinton (
talk)
09:45, 22 May 2019 (UTC)reply
Please update with: "Monitoring the Morphology of M87* in 2009–2017 with the Event Horizon Telescope"
Please add some short info on and/or images from the study to the article. It's currently featured in
2020 in science (September) like so:
Scientists publish new findings and data about the
supermassive black holeM87*, including a video of the black hole based on data not sufficient for images, using statistical modeling about changes in its appearance in 2009–2017, showing variations of its orientation and a wobbling ring – constituting the "first glimpse of the dynamical structure of the
accretion flow so close to the black hole's
event horizon".[1][2]
The study and its images are licensed under CC BY 4.0 so you could upload the images or animations to Commons and add them here as adequate.