What is the light source in the black hole images? The 2019 Stack Overflow Developer Survey Results Are InIf nothing travels at the speed of light, except light, how can a black hole also pull light into itself?Does gravitational lensing cause a black-hole to be the main 'source' of light in a given area?What is a low mass Black Hole?Luminosity of black hole accretion discCan matter fly directly into a black hole and avoid the accretion disc?what is the dimension of Black Hole?Speed of light in a black holeHas a “white hole” theory been advanced to explain anomalous star formation in Sagittarius A?What defines the plane of an accretion disk around a black hole?What is the exact meaning of vicinity of Black hole or a disk? the same as inside?
What's the name of these plastic connectors
How to obtain a position of last non-zero element
What is preventing me from simply constructing a hash that's lower than the current target?
How come people say “Would of”?
What do I do when my TA workload is more than expected?
Accepted by European university, rejected by all American ones I applied to? Possible reasons?
How did passengers keep warm on sail ships?
What is the most efficient way to store a numeric range?
Mathematics of imaging the black hole
What is this sharp, curved notch on my knife for?
Why was M87 targeted for the Event Horizon Telescope instead of Sagittarius A*?
Why are there uneven bright areas in this photo of black hole?
How to notate time signature switching consistently every measure
How to charge AirPods to keep battery healthy?
What to do when moving next to a bird sanctuary with a loosely-domesticated cat?
For what reasons would an animal species NOT cross a *horizontal* land bridge?
What does Linus Torvalds mean when he says that Git "never ever" tracks a file?
What do these terms in Caesar's Gallic wars mean?
Star Trek - X-shaped Item on Regula/Orbital Office Starbases
"as much details as you can remember"
What do hard-Brexiteers want with respect to the Irish border?
What information about me do stores get via my credit card?
How can I add encounters in the Lost Mine of Phandelver campaign without giving PCs too much XP?
Can withdrawing asylum be illegal?
What is the light source in the black hole images?
The 2019 Stack Overflow Developer Survey Results Are InIf nothing travels at the speed of light, except light, how can a black hole also pull light into itself?Does gravitational lensing cause a black-hole to be the main 'source' of light in a given area?What is a low mass Black Hole?Luminosity of black hole accretion discCan matter fly directly into a black hole and avoid the accretion disc?what is the dimension of Black Hole?Speed of light in a black holeHas a “white hole” theory been advanced to explain anomalous star formation in Sagittarius A?What defines the plane of an accretion disk around a black hole?What is the exact meaning of vicinity of Black hole or a disk? the same as inside?
$begingroup$
What is the light source in the black hole images?
I've searched the site before asking, as well as tried to google it. But perhaps the answer is buried due to the recent news.
My understanding, is that the ring in the images is an illuminated accretion disc.
What I could not find explained is the light source, and by extension, why is a bright accretion disc – which is round by definition – a proof for light bending? (I'm not disputing the fact.)
black-hole accretion-discs
asked 7 hours ago
user11801user11801
1212
New contributor
user11801 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
add a comment |
$begingroup$
What is the light source in the black hole images?
I've searched the site before asking, as well as tried to google it. But perhaps the answer is buried due to the recent news.
My understanding, is that the ring in the images is an illuminated accretion disc.
What I could not find explained is the light source, and by extension, why is a bright accretion disc – which is round by definition – a proof for light bending? (I'm not disputing the fact.)
black-hole accretion-discs
asked 7 hours ago
user11801user11801
1212
New contributor
user11801 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
$begingroup$
I don't know if this helps, but from what I read, the people who worked on this decided themselves what color it would be in the picture.
$endgroup$
– Shule
2 hours ago
add a comment |
$begingroup$
What is the light source in the black hole images?
I've searched the site before asking, as well as tried to google it. But perhaps the answer is buried due to the recent news.
My understanding, is that the ring in the images is an illuminated accretion disc.
What I could not find explained is the light source, and by extension, why is a bright accretion disc – which is round by definition – a proof for light bending? (I'm not disputing the fact.)
black-hole accretion-discs
asked 7 hours ago
user11801user11801
1212
New contributor
user11801 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$endgroup$
What is the light source in the black hole images?
I've searched the site before asking, as well as tried to google it. But perhaps the answer is buried due to the recent news.
My understanding, is that the ring in the images is an illuminated accretion disc.
What I could not find explained is the light source, and by extension, why is a bright accretion disc – which is round by definition – a proof for light bending? (I'm not disputing the fact.)
black-hole accretion-discs
black-hole accretion-discs
asked 7 hours ago
user11801user11801
1212
New contributor
user11801 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 7 hours ago
user11801user11801
1212
New contributor
user11801 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 7 hours ago
user11801user11801
1212
New contributor
user11801 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 7 hours ago
user11801user11801
1212
asked 7 hours ago
user11801user11801
1212
1212
New contributor
user11801 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
user11801 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
user11801 is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
$begingroup$
I don't know if this helps, but from what I read, the people who worked on this decided themselves what color it would be in the picture.
$endgroup$
– Shule
2 hours ago
add a comment |
$begingroup$
I don't know if this helps, but from what I read, the people who worked on this decided themselves what color it would be in the picture.
$endgroup$
– Shule
2 hours ago
$begingroup$
I don't know if this helps, but from what I read, the people who worked on this decided themselves what color it would be in the picture.
$endgroup$
– Shule
2 hours ago
$begingroup$
I don't know if this helps, but from what I read, the people who worked on this decided themselves what color it would be in the picture.
$endgroup$
– Shule
2 hours ago
add a comment |
2 Answers
2
active
oldest
votes
$begingroup$
Friction and turbulence from the material orbiting the black hole causes the accretion disk to heat up and emit light. The inner parts of the accretion disk get the hottest and tend to emit at the shortest wavelengths (X-rays normally) with longer wavelength (optical, IR, radio) normally coming from the material further out and above the disk which is photo-ionized by the X-rays. Depending on the density of the material in and around the accretion disk, the angle we are viewing it from and whether the accretion disk flares up at larger radii, will control what the accretion disk/AGN will appear as which part of the spectrum will be seen most strongly. There is some additional information on accretion disks and how they work at this EU Strong Gravity research site and a more technical review article in this conference proceedings.
answered 4 hours ago
astrosnapperastrosnapper
3,217525
$endgroup$
$begingroup$
This is great, thanks. Any idea on the second part: Since they're already round, what's that got to do with light bending?
$endgroup$
– user11801
4 hours ago
$begingroup$
I've not read the papers (or even the press release) in detail but I thought the proof of light bending was from the size of the black hole in the middle of the accretion disk being larger than you would expect without light bending rather than from the disk image itself ?
$endgroup$
– astrosnapper
3 hours ago
$begingroup$
As @Steve Linton says in his answer, the mm waves observed by the EHT are primarily from synchrotron radiation and not from thermal radiation. See iopscience.iop.org/article/10.3847/2041-8213/ab0f43/meta for some discussions and references to more.
$endgroup$
– Mark Olson
3 hours ago
add a comment |
$begingroup$
The radiation being detected in this case is mostly synchroton radiation, caused by energetic electrons spiralling around magnetic field line, rather than thermal radiation, but it comes from the same place (the disk). The actual evidence for light bending is, I believe the dark area in the middle, which is several times larger than the actual event horizon and is caused because the light that would have been coming to us from that direction has been bent away.
answered 4 hours ago
Steve LintonSteve Linton
2,5231319
$endgroup$
add a comment |
Your Answer
StackExchange.ifUsing("editor", function ()
return StackExchange.using("mathjaxEditing", function ()
StackExchange.MarkdownEditor.creationCallbacks.add(function (editor, postfix)
StackExchange.mathjaxEditing.prepareWmdForMathJax(editor, postfix, [["$", "$"], ["\\(","\\)"]]);
);
);
, "mathjax-editing");
StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "514"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);
StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);
else
createEditor();
);
function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: false,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: null,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
noCode: true, onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);
);
user11801 is a new contributor. Be nice, and check out our Code of Conduct.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fastronomy.stackexchange.com%2fquestions%2f30373%2fwhat-is-the-light-source-in-the-black-hole-images%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Friction and turbulence from the material orbiting the black hole causes the accretion disk to heat up and emit light. The inner parts of the accretion disk get the hottest and tend to emit at the shortest wavelengths (X-rays normally) with longer wavelength (optical, IR, radio) normally coming from the material further out and above the disk which is photo-ionized by the X-rays. Depending on the density of the material in and around the accretion disk, the angle we are viewing it from and whether the accretion disk flares up at larger radii, will control what the accretion disk/AGN will appear as which part of the spectrum will be seen most strongly. There is some additional information on accretion disks and how they work at this EU Strong Gravity research site and a more technical review article in this conference proceedings.
answered 4 hours ago
astrosnapperastrosnapper
3,217525
$endgroup$
$begingroup$
This is great, thanks. Any idea on the second part: Since they're already round, what's that got to do with light bending?
$endgroup$
– user11801
4 hours ago
$begingroup$
I've not read the papers (or even the press release) in detail but I thought the proof of light bending was from the size of the black hole in the middle of the accretion disk being larger than you would expect without light bending rather than from the disk image itself ?
$endgroup$
– astrosnapper
3 hours ago
$begingroup$
As @Steve Linton says in his answer, the mm waves observed by the EHT are primarily from synchrotron radiation and not from thermal radiation. See iopscience.iop.org/article/10.3847/2041-8213/ab0f43/meta for some discussions and references to more.
$endgroup$
– Mark Olson
3 hours ago
add a comment |
$begingroup$
Friction and turbulence from the material orbiting the black hole causes the accretion disk to heat up and emit light. The inner parts of the accretion disk get the hottest and tend to emit at the shortest wavelengths (X-rays normally) with longer wavelength (optical, IR, radio) normally coming from the material further out and above the disk which is photo-ionized by the X-rays. Depending on the density of the material in and around the accretion disk, the angle we are viewing it from and whether the accretion disk flares up at larger radii, will control what the accretion disk/AGN will appear as which part of the spectrum will be seen most strongly. There is some additional information on accretion disks and how they work at this EU Strong Gravity research site and a more technical review article in this conference proceedings.
answered 4 hours ago
astrosnapperastrosnapper
3,217525
$endgroup$
$begingroup$
This is great, thanks. Any idea on the second part: Since they're already round, what's that got to do with light bending?
$endgroup$
– user11801
4 hours ago
$begingroup$
I've not read the papers (or even the press release) in detail but I thought the proof of light bending was from the size of the black hole in the middle of the accretion disk being larger than you would expect without light bending rather than from the disk image itself ?
$endgroup$
– astrosnapper
3 hours ago
$begingroup$
As @Steve Linton says in his answer, the mm waves observed by the EHT are primarily from synchrotron radiation and not from thermal radiation. See iopscience.iop.org/article/10.3847/2041-8213/ab0f43/meta for some discussions and references to more.
$endgroup$
– Mark Olson
3 hours ago
add a comment |
$begingroup$
Friction and turbulence from the material orbiting the black hole causes the accretion disk to heat up and emit light. The inner parts of the accretion disk get the hottest and tend to emit at the shortest wavelengths (X-rays normally) with longer wavelength (optical, IR, radio) normally coming from the material further out and above the disk which is photo-ionized by the X-rays. Depending on the density of the material in and around the accretion disk, the angle we are viewing it from and whether the accretion disk flares up at larger radii, will control what the accretion disk/AGN will appear as which part of the spectrum will be seen most strongly. There is some additional information on accretion disks and how they work at this EU Strong Gravity research site and a more technical review article in this conference proceedings.
answered 4 hours ago
astrosnapperastrosnapper
3,217525
$endgroup$
Friction and turbulence from the material orbiting the black hole causes the accretion disk to heat up and emit light. The inner parts of the accretion disk get the hottest and tend to emit at the shortest wavelengths (X-rays normally) with longer wavelength (optical, IR, radio) normally coming from the material further out and above the disk which is photo-ionized by the X-rays. Depending on the density of the material in and around the accretion disk, the angle we are viewing it from and whether the accretion disk flares up at larger radii, will control what the accretion disk/AGN will appear as which part of the spectrum will be seen most strongly. There is some additional information on accretion disks and how they work at this EU Strong Gravity research site and a more technical review article in this conference proceedings.
answered 4 hours ago
astrosnapperastrosnapper
3,217525
answered 4 hours ago
astrosnapperastrosnapper
3,217525
answered 4 hours ago
astrosnapperastrosnapper
3,217525
answered 4 hours ago
astrosnapperastrosnapper
3,217525
3,217525
$begingroup$
This is great, thanks. Any idea on the second part: Since they're already round, what's that got to do with light bending?
$endgroup$
– user11801
4 hours ago
$begingroup$
I've not read the papers (or even the press release) in detail but I thought the proof of light bending was from the size of the black hole in the middle of the accretion disk being larger than you would expect without light bending rather than from the disk image itself ?
$endgroup$
– astrosnapper
3 hours ago
$begingroup$
As @Steve Linton says in his answer, the mm waves observed by the EHT are primarily from synchrotron radiation and not from thermal radiation. See iopscience.iop.org/article/10.3847/2041-8213/ab0f43/meta for some discussions and references to more.
$endgroup$
– Mark Olson
3 hours ago
add a comment |
$begingroup$
This is great, thanks. Any idea on the second part: Since they're already round, what's that got to do with light bending?
$endgroup$
– user11801
4 hours ago
$begingroup$
I've not read the papers (or even the press release) in detail but I thought the proof of light bending was from the size of the black hole in the middle of the accretion disk being larger than you would expect without light bending rather than from the disk image itself ?
$endgroup$
– astrosnapper
3 hours ago
$begingroup$
As @Steve Linton says in his answer, the mm waves observed by the EHT are primarily from synchrotron radiation and not from thermal radiation. See iopscience.iop.org/article/10.3847/2041-8213/ab0f43/meta for some discussions and references to more.
$endgroup$
– Mark Olson
3 hours ago
$begingroup$
This is great, thanks. Any idea on the second part: Since they're already round, what's that got to do with light bending?
$endgroup$
– user11801
4 hours ago
$begingroup$
This is great, thanks. Any idea on the second part: Since they're already round, what's that got to do with light bending?
$endgroup$
– user11801
4 hours ago
$begingroup$
I've not read the papers (or even the press release) in detail but I thought the proof of light bending was from the size of the black hole in the middle of the accretion disk being larger than you would expect without light bending rather than from the disk image itself ?
$endgroup$
– astrosnapper
3 hours ago
$begingroup$
I've not read the papers (or even the press release) in detail but I thought the proof of light bending was from the size of the black hole in the middle of the accretion disk being larger than you would expect without light bending rather than from the disk image itself ?
$endgroup$
– astrosnapper
3 hours ago
$begingroup$
As @Steve Linton says in his answer, the mm waves observed by the EHT are primarily from synchrotron radiation and not from thermal radiation. See iopscience.iop.org/article/10.3847/2041-8213/ab0f43/meta for some discussions and references to more.
$endgroup$
– Mark Olson
3 hours ago
$begingroup$
As @Steve Linton says in his answer, the mm waves observed by the EHT are primarily from synchrotron radiation and not from thermal radiation. See iopscience.iop.org/article/10.3847/2041-8213/ab0f43/meta for some discussions and references to more.
$endgroup$
– Mark Olson
3 hours ago
add a comment |
$begingroup$
The radiation being detected in this case is mostly synchroton radiation, caused by energetic electrons spiralling around magnetic field line, rather than thermal radiation, but it comes from the same place (the disk). The actual evidence for light bending is, I believe the dark area in the middle, which is several times larger than the actual event horizon and is caused because the light that would have been coming to us from that direction has been bent away.
answered 4 hours ago
Steve LintonSteve Linton
2,5231319
$endgroup$
add a comment |
$begingroup$
The radiation being detected in this case is mostly synchroton radiation, caused by energetic electrons spiralling around magnetic field line, rather than thermal radiation, but it comes from the same place (the disk). The actual evidence for light bending is, I believe the dark area in the middle, which is several times larger than the actual event horizon and is caused because the light that would have been coming to us from that direction has been bent away.
answered 4 hours ago
Steve LintonSteve Linton
2,5231319
$endgroup$
add a comment |
$begingroup$
The radiation being detected in this case is mostly synchroton radiation, caused by energetic electrons spiralling around magnetic field line, rather than thermal radiation, but it comes from the same place (the disk). The actual evidence for light bending is, I believe the dark area in the middle, which is several times larger than the actual event horizon and is caused because the light that would have been coming to us from that direction has been bent away.
answered 4 hours ago
Steve LintonSteve Linton
2,5231319
$endgroup$
The radiation being detected in this case is mostly synchroton radiation, caused by energetic electrons spiralling around magnetic field line, rather than thermal radiation, but it comes from the same place (the disk). The actual evidence for light bending is, I believe the dark area in the middle, which is several times larger than the actual event horizon and is caused because the light that would have been coming to us from that direction has been bent away.
answered 4 hours ago
Steve LintonSteve Linton
2,5231319
answered 4 hours ago
Steve LintonSteve Linton
2,5231319
answered 4 hours ago
Steve LintonSteve Linton
2,5231319
answered 4 hours ago
Steve LintonSteve Linton
2,5231319
2,5231319
add a comment |
add a comment |
user11801 is a new contributor. Be nice, and check out our Code of Conduct.
user11801 is a new contributor. Be nice, and check out our Code of Conduct.
user11801 is a new contributor. Be nice, and check out our Code of Conduct.
user11801 is a new contributor. Be nice, and check out our Code of Conduct.
Thanks for contributing an answer to Astronomy Stack Exchange!
- Please be sure to answer the question. Provide details and share your research!
But avoid …
- Asking for help, clarification, or responding to other answers.
- Making statements based on opinion; back them up with references or personal experience.
Use MathJax to format equations. MathJax reference.
To learn more, see our tips on writing great answers.
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fastronomy.stackexchange.com%2fquestions%2f30373%2fwhat-is-the-light-source-in-the-black-hole-images%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Sign up or log in
StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Sign up using Google
Sign up using Facebook
Sign up using Email and Password
Post as a guest
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
Required, but never shown
$begingroup$
I don't know if this helps, but from what I read, the people who worked on this decided themselves what color it would be in the picture.
$endgroup$
– Shule
2 hours ago