What is the light source in the black hole images? Announcing the arrival of Valued Associate #679: Cesar Manara Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern) What stellar content do we want to share with Twitter?If 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?
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What is the light source in the black hole images?
Announcing the arrival of Valued Associate #679: Cesar Manara
Planned maintenance scheduled April 17/18, 2019 at 00:00UTC (8:00pm US/Eastern)
What stellar content do we want to share with Twitter?If 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 Apr 11 at 16:32
user11801user11801
1233
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 Apr 11 at 16:32
user11801user11801
1233
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
Apr 11 at 21:48
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 Apr 11 at 16:32
user11801user11801
1233
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 Apr 11 at 16:32
user11801user11801
1233
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 Apr 11 at 16:32
user11801user11801
1233
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 Apr 11 at 16:32
user11801user11801
1233
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 Apr 11 at 16:32
user11801user11801
1233
asked Apr 11 at 16:32
user11801user11801
1233
1233
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
Apr 11 at 21:48
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
Apr 11 at 21:48
$begingroup$
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
Apr 11 at 21:48
$begingroup$
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
Apr 11 at 21:48
add a comment |
2 Answers
2
active
oldest
votes
$begingroup$
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 Apr 11 at 19:45
Steve LintonSteve Linton
2,6681320
$endgroup$
add a comment |
$begingroup$
Accretion disks are a complicated system which produces a wide variety of emission across the electromagnetic spectrum on a variety of timescales. The diagram below shows (some) of what is going on schematically, along with typical sizes scales (bars with arrows with sizes in parsecs (pc)). Details about how the "central engine" of supermassive black holes and AGN works and exactly how the energy is generated is an ongoing topic of research, which the Event Horizon Telescope images will very likely contribute to.
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.
In the case of the sub-mm images produced by EHT, the emission is though to be coming from the ionized plasma closest to the inner edge of the accretion disk (the red region around the black hole in the bottom zoomed-in plot) via synchrotron emission as electrons are accelerated by the magnetic fields of the plasma. This is in contrast to the jet radio emission which is on a larger scale and separation and often extends several galaxy radii which can be seen in e.g. this VLA/VLBI composite radio image.
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 Apr 11 at 19:06
astrosnapperastrosnapper
3,215525
$endgroup$
$begingroup$
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
Apr 11 at 19:18
$begingroup$
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
Apr 11 at 20:07
2
$begingroup$
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
Apr 11 at 21:01
$begingroup$
This answer suggests the radiation to be thermal. While there should be thermal radiation from the accretion disk or whatever falling matter, the spectrum is that of synchrotron radiation. Thius is specifically said in the papers about M87 bh.
$endgroup$
– Alchimista
Apr 12 at 7:39
add a comment |
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2 Answers
2
active
oldest
votes
2 Answers
2
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
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 Apr 11 at 19:45
Steve LintonSteve Linton
2,6681320
$endgroup$
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 Apr 11 at 19:45
Steve LintonSteve Linton
2,6681320
$endgroup$
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 Apr 11 at 19:45
Steve LintonSteve Linton
2,6681320
$endgroup$
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 Apr 11 at 19:45
Steve LintonSteve Linton
2,6681320
answered Apr 11 at 19:45
Steve LintonSteve Linton
2,6681320
answered Apr 11 at 19:45
Steve LintonSteve Linton
2,6681320
answered Apr 11 at 19:45
Steve LintonSteve Linton
2,6681320
2,6681320
add a comment |
add a comment |
$begingroup$
Accretion disks are a complicated system which produces a wide variety of emission across the electromagnetic spectrum on a variety of timescales. The diagram below shows (some) of what is going on schematically, along with typical sizes scales (bars with arrows with sizes in parsecs (pc)). Details about how the "central engine" of supermassive black holes and AGN works and exactly how the energy is generated is an ongoing topic of research, which the Event Horizon Telescope images will very likely contribute to.
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.
In the case of the sub-mm images produced by EHT, the emission is though to be coming from the ionized plasma closest to the inner edge of the accretion disk (the red region around the black hole in the bottom zoomed-in plot) via synchrotron emission as electrons are accelerated by the magnetic fields of the plasma. This is in contrast to the jet radio emission which is on a larger scale and separation and often extends several galaxy radii which can be seen in e.g. this VLA/VLBI composite radio image.
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 Apr 11 at 19:06
astrosnapperastrosnapper
3,215525
$endgroup$
$begingroup$
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
Apr 11 at 19:18
$begingroup$
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
Apr 11 at 20:07
2
$begingroup$
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
Apr 11 at 21:01
$begingroup$
This answer suggests the radiation to be thermal. While there should be thermal radiation from the accretion disk or whatever falling matter, the spectrum is that of synchrotron radiation. Thius is specifically said in the papers about M87 bh.
$endgroup$
– Alchimista
Apr 12 at 7:39
add a comment |
$begingroup$
Accretion disks are a complicated system which produces a wide variety of emission across the electromagnetic spectrum on a variety of timescales. The diagram below shows (some) of what is going on schematically, along with typical sizes scales (bars with arrows with sizes in parsecs (pc)). Details about how the "central engine" of supermassive black holes and AGN works and exactly how the energy is generated is an ongoing topic of research, which the Event Horizon Telescope images will very likely contribute to.
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.
In the case of the sub-mm images produced by EHT, the emission is though to be coming from the ionized plasma closest to the inner edge of the accretion disk (the red region around the black hole in the bottom zoomed-in plot) via synchrotron emission as electrons are accelerated by the magnetic fields of the plasma. This is in contrast to the jet radio emission which is on a larger scale and separation and often extends several galaxy radii which can be seen in e.g. this VLA/VLBI composite radio image.
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 Apr 11 at 19:06
astrosnapperastrosnapper
3,215525
$endgroup$
$begingroup$
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
Apr 11 at 19:18
$begingroup$
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
Apr 11 at 20:07
2
$begingroup$
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
Apr 11 at 21:01
$begingroup$
This answer suggests the radiation to be thermal. While there should be thermal radiation from the accretion disk or whatever falling matter, the spectrum is that of synchrotron radiation. Thius is specifically said in the papers about M87 bh.
$endgroup$
– Alchimista
Apr 12 at 7:39
add a comment |
$begingroup$
Accretion disks are a complicated system which produces a wide variety of emission across the electromagnetic spectrum on a variety of timescales. The diagram below shows (some) of what is going on schematically, along with typical sizes scales (bars with arrows with sizes in parsecs (pc)). Details about how the "central engine" of supermassive black holes and AGN works and exactly how the energy is generated is an ongoing topic of research, which the Event Horizon Telescope images will very likely contribute to.
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.
In the case of the sub-mm images produced by EHT, the emission is though to be coming from the ionized plasma closest to the inner edge of the accretion disk (the red region around the black hole in the bottom zoomed-in plot) via synchrotron emission as electrons are accelerated by the magnetic fields of the plasma. This is in contrast to the jet radio emission which is on a larger scale and separation and often extends several galaxy radii which can be seen in e.g. this VLA/VLBI composite radio image.
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 Apr 11 at 19:06
astrosnapperastrosnapper
3,215525
$endgroup$
Accretion disks are a complicated system which produces a wide variety of emission across the electromagnetic spectrum on a variety of timescales. The diagram below shows (some) of what is going on schematically, along with typical sizes scales (bars with arrows with sizes in parsecs (pc)). Details about how the "central engine" of supermassive black holes and AGN works and exactly how the energy is generated is an ongoing topic of research, which the Event Horizon Telescope images will very likely contribute to.
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.
In the case of the sub-mm images produced by EHT, the emission is though to be coming from the ionized plasma closest to the inner edge of the accretion disk (the red region around the black hole in the bottom zoomed-in plot) via synchrotron emission as electrons are accelerated by the magnetic fields of the plasma. This is in contrast to the jet radio emission which is on a larger scale and separation and often extends several galaxy radii which can be seen in e.g. this VLA/VLBI composite radio image.
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 Apr 11 at 19:06
astrosnapperastrosnapper
3,215525
edited Apr 12 at 19:32
answered Apr 11 at 19:06
astrosnapperastrosnapper
3,215525
answered Apr 11 at 19:06
astrosnapperastrosnapper
3,215525
answered Apr 11 at 19:06
astrosnapperastrosnapper
3,215525
3,215525
$begingroup$
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
Apr 11 at 19:18
$begingroup$
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
Apr 11 at 20:07
2
$begingroup$
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
Apr 11 at 21:01
$begingroup$
This answer suggests the radiation to be thermal. While there should be thermal radiation from the accretion disk or whatever falling matter, the spectrum is that of synchrotron radiation. Thius is specifically said in the papers about M87 bh.
$endgroup$
– Alchimista
Apr 12 at 7:39
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
Apr 11 at 19:18
$begingroup$
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
Apr 11 at 20:07
2
$begingroup$
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
Apr 11 at 21:01
$begingroup$
This answer suggests the radiation to be thermal. While there should be thermal radiation from the accretion disk or whatever falling matter, the spectrum is that of synchrotron radiation. Thius is specifically said in the papers about M87 bh.
$endgroup$
– Alchimista
Apr 12 at 7:39
$begingroup$
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
Apr 11 at 19:18
$begingroup$
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
Apr 11 at 19:18
$begingroup$
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
Apr 11 at 20:07
$begingroup$
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
Apr 11 at 20:07
2
2
$begingroup$
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
Apr 11 at 21:01
$begingroup$
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
Apr 11 at 21:01
$begingroup$
This answer suggests the radiation to be thermal. While there should be thermal radiation from the accretion disk or whatever falling matter, the spectrum is that of synchrotron radiation. Thius is specifically said in the papers about M87 bh.
$endgroup$
– Alchimista
Apr 12 at 7:39
$begingroup$
This answer suggests the radiation to be thermal. While there should be thermal radiation from the accretion disk or whatever falling matter, the spectrum is that of synchrotron radiation. Thius is specifically said in the papers about M87 bh.
$endgroup$
– Alchimista
Apr 12 at 7:39
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.
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$begingroup$
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
Apr 11 at 21:48