Why didn't the Event Horizon Telescope team mention Sagittarius A*? 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?Why not capture also Milky Way's black hole image?Why not take a picture of a closer black hole?Why don't Neutron Stars form event horizon?Does matter accumulate just outside the event horizon of a black hole?How does the Event Horizon Telescope implement the interferometry?Black hole, escape velocity, going up?Why did the Event Horizon Telescope take so long to take a photo of a black hole?What is the orientation of the M87 black hole image relative to the jet?Event Horizon Telescope Data CleanupWhat else could the Event Horizon Telescope Observe?What is the actual resolution of Event Horizon Telescope?Do the “schwarzschild metric” or the “isotropic metric” fit the Event Horizon telescope data on Messier 87 better?
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Why didn't the Event Horizon Telescope team mention Sagittarius A*?
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?Why not capture also Milky Way's black hole image?Why not take a picture of a closer black hole?Why don't Neutron Stars form event horizon?Does matter accumulate just outside the event horizon of a black hole?How does the Event Horizon Telescope implement the interferometry?Black hole, escape velocity, going up?Why did the Event Horizon Telescope take so long to take a photo of a black hole?What is the orientation of the M87 black hole image relative to the jet?Event Horizon Telescope Data CleanupWhat else could the Event Horizon Telescope Observe?What is the actual resolution of Event Horizon Telescope?Do the “schwarzschild metric” or the “isotropic metric” fit the Event Horizon telescope data on Messier 87 better?
$begingroup$
At the press conference this morning, the Event Horizon Telescope team didn't say much about Sagittarius A*, which was the target many of us have been waiting for.
Is there any explanation anywhere for this omission?
black-hole supermassive-black-hole sagittarius-a event-horizon-telescope
asked Apr 10 at 14:00
White PrimeWhite Prime
23239
$endgroup$
add a comment |
$begingroup$
At the press conference this morning, the Event Horizon Telescope team didn't say much about Sagittarius A*, which was the target many of us have been waiting for.
Is there any explanation anywhere for this omission?
black-hole supermassive-black-hole sagittarius-a event-horizon-telescope
asked Apr 10 at 14:00
White PrimeWhite Prime
23239
$endgroup$
1
$begingroup$
Related question - Why not take a picture of a closer black hole?
$endgroup$
– BruceWayne
Apr 11 at 15:06
add a comment |
$begingroup$
At the press conference this morning, the Event Horizon Telescope team didn't say much about Sagittarius A*, which was the target many of us have been waiting for.
Is there any explanation anywhere for this omission?
black-hole supermassive-black-hole sagittarius-a event-horizon-telescope
asked Apr 10 at 14:00
White PrimeWhite Prime
23239
$endgroup$
At the press conference this morning, the Event Horizon Telescope team didn't say much about Sagittarius A*, which was the target many of us have been waiting for.
Is there any explanation anywhere for this omission?
black-hole supermassive-black-hole sagittarius-a event-horizon-telescope
black-hole supermassive-black-hole sagittarius-a event-horizon-telescope
asked Apr 10 at 14:00
White PrimeWhite Prime
23239
asked Apr 10 at 14:00
White PrimeWhite Prime
23239
edited 8 hours ago
White Prime
asked Apr 10 at 14:00
White PrimeWhite Prime
23239
asked Apr 10 at 14:00
White PrimeWhite Prime
23239
asked Apr 10 at 14:00
White PrimeWhite Prime
23239
23239
1
$begingroup$
Related question - Why not take a picture of a closer black hole?
$endgroup$
– BruceWayne
Apr 11 at 15:06
add a comment |
1
$begingroup$
Related question - Why not take a picture of a closer black hole?
$endgroup$
– BruceWayne
Apr 11 at 15:06
1
1
$begingroup$
Related question - Why not take a picture of a closer black hole?
$endgroup$
– BruceWayne
Apr 11 at 15:06
$begingroup$
Related question - Why not take a picture of a closer black hole?
$endgroup$
– BruceWayne
Apr 11 at 15:06
add a comment |
2 Answers
2
active
oldest
votes
$begingroup$
There was a mention of Sagittarius A* during the Q+A portion of the press conference; the team indicated that they hope to produce an image sometime in the future (although they were careful to make no promises, and they're not assuming they'll be successful).
That said, I'm not wholly surprised that we ended up seeing M87, rather than Sgr A*, for a couple reasons which the team mentions in their first paper:
- As Glorfindel said, Sgr A*'s event horizon is much smaller, meaning matter orbiting the black hole has a shorter orbital period. This contributes to variability on the timescale of minutes. The observations of M87 took place over the course of a week - roughly the timescale over which that target varies, meaning the source should not change significantly over that time.
- Second - and this is the reason I've seen cited more often - Sgr A* lies in the center of our galaxy, and so thick clouds of gas and dust lie between it and us. That results in scattering, which is a problem. There are ways to mitigate this, of course, and the team has spent a long time on this, but it's simpler to just look at the black hole that doesn't have that problem in the first place. That's why M87's black hole is an attractive target.
Neither of these are impossible hurdles to overcome, but they're certainly very real difficulties that can't be ignored.
answered Apr 10 at 14:19
HDE 226868♦HDE 226868
21k270130
$endgroup$
1
$begingroup$
I saw multiple reports before hand that it was expected that they'd release images of both. Did that turn out to be nothing more than speculation?
$endgroup$
– curiousdannii
Apr 12 at 4:23
add a comment |
$begingroup$
I've found an explanation in Dutch here by Heino Falcke, one of the EHT founders. Translation:
Hard to photograph
It was easiest to take a picture of M87. "It is very difficult to photograph the black hole in our Milky Way, because the material around it moves very fast: the vortex rotates around its axis in 20 minutes. Compare it to a toddler who has to sit still for hours to be photographed: that's not possible. With M87, the matter revolves around the hole in two days, so it's easier to photograph", says Falcke.
(The original text is as follows:)
Lastig te fotograferen
Het lukte het beste om een foto te maken van M87. "Het is heel lastig om het zwarte gat in onze Melkweg op de foto te zetten, doordat de materie daaromheen heel snel beweegt: de draaikolk draait in 20 minuten om zijn as. Vergelijk het met een kleuter die urenlang stil moet zitten om op de foto te gaan: dat gaat niet. Bij M87 draait de materie in twee dagen om het gat heen, dus dat is makkelijker te fotograferen", zegt Falcke.
answered Apr 10 at 14:03
GlorfindelGlorfindel
2,3642927
$endgroup$
2
$begingroup$
Are you sure about the "matter revolves around the hole in two days" part ? I've heard the event horizon has roughly a diameter of 100 billions km, and even at speed close to c that's about 2 weeks for a complete revolution
$endgroup$
– Keelhaul
Apr 11 at 12:38
$begingroup$
I'm just quoting one of the people involved in the project, I haven't verified his statements ...
$endgroup$
– Glorfindel
Apr 11 at 12:39
$begingroup$
The Schwarzchild radius of the M87 black hole is about 20 billion km.
$endgroup$
– Steve Linton
Apr 12 at 12:27
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
$begingroup$
There was a mention of Sagittarius A* during the Q+A portion of the press conference; the team indicated that they hope to produce an image sometime in the future (although they were careful to make no promises, and they're not assuming they'll be successful).
That said, I'm not wholly surprised that we ended up seeing M87, rather than Sgr A*, for a couple reasons which the team mentions in their first paper:
- As Glorfindel said, Sgr A*'s event horizon is much smaller, meaning matter orbiting the black hole has a shorter orbital period. This contributes to variability on the timescale of minutes. The observations of M87 took place over the course of a week - roughly the timescale over which that target varies, meaning the source should not change significantly over that time.
- Second - and this is the reason I've seen cited more often - Sgr A* lies in the center of our galaxy, and so thick clouds of gas and dust lie between it and us. That results in scattering, which is a problem. There are ways to mitigate this, of course, and the team has spent a long time on this, but it's simpler to just look at the black hole that doesn't have that problem in the first place. That's why M87's black hole is an attractive target.
Neither of these are impossible hurdles to overcome, but they're certainly very real difficulties that can't be ignored.
answered Apr 10 at 14:19
HDE 226868♦HDE 226868
21k270130
$endgroup$
1
$begingroup$
I saw multiple reports before hand that it was expected that they'd release images of both. Did that turn out to be nothing more than speculation?
$endgroup$
– curiousdannii
Apr 12 at 4:23
add a comment |
$begingroup$
There was a mention of Sagittarius A* during the Q+A portion of the press conference; the team indicated that they hope to produce an image sometime in the future (although they were careful to make no promises, and they're not assuming they'll be successful).
That said, I'm not wholly surprised that we ended up seeing M87, rather than Sgr A*, for a couple reasons which the team mentions in their first paper:
- As Glorfindel said, Sgr A*'s event horizon is much smaller, meaning matter orbiting the black hole has a shorter orbital period. This contributes to variability on the timescale of minutes. The observations of M87 took place over the course of a week - roughly the timescale over which that target varies, meaning the source should not change significantly over that time.
- Second - and this is the reason I've seen cited more often - Sgr A* lies in the center of our galaxy, and so thick clouds of gas and dust lie between it and us. That results in scattering, which is a problem. There are ways to mitigate this, of course, and the team has spent a long time on this, but it's simpler to just look at the black hole that doesn't have that problem in the first place. That's why M87's black hole is an attractive target.
Neither of these are impossible hurdles to overcome, but they're certainly very real difficulties that can't be ignored.
answered Apr 10 at 14:19
HDE 226868♦HDE 226868
21k270130
$endgroup$
1
$begingroup$
I saw multiple reports before hand that it was expected that they'd release images of both. Did that turn out to be nothing more than speculation?
$endgroup$
– curiousdannii
Apr 12 at 4:23
add a comment |
$begingroup$
There was a mention of Sagittarius A* during the Q+A portion of the press conference; the team indicated that they hope to produce an image sometime in the future (although they were careful to make no promises, and they're not assuming they'll be successful).
That said, I'm not wholly surprised that we ended up seeing M87, rather than Sgr A*, for a couple reasons which the team mentions in their first paper:
- As Glorfindel said, Sgr A*'s event horizon is much smaller, meaning matter orbiting the black hole has a shorter orbital period. This contributes to variability on the timescale of minutes. The observations of M87 took place over the course of a week - roughly the timescale over which that target varies, meaning the source should not change significantly over that time.
- Second - and this is the reason I've seen cited more often - Sgr A* lies in the center of our galaxy, and so thick clouds of gas and dust lie between it and us. That results in scattering, which is a problem. There are ways to mitigate this, of course, and the team has spent a long time on this, but it's simpler to just look at the black hole that doesn't have that problem in the first place. That's why M87's black hole is an attractive target.
Neither of these are impossible hurdles to overcome, but they're certainly very real difficulties that can't be ignored.
answered Apr 10 at 14:19
HDE 226868♦HDE 226868
21k270130
$endgroup$
There was a mention of Sagittarius A* during the Q+A portion of the press conference; the team indicated that they hope to produce an image sometime in the future (although they were careful to make no promises, and they're not assuming they'll be successful).
That said, I'm not wholly surprised that we ended up seeing M87, rather than Sgr A*, for a couple reasons which the team mentions in their first paper:
- As Glorfindel said, Sgr A*'s event horizon is much smaller, meaning matter orbiting the black hole has a shorter orbital period. This contributes to variability on the timescale of minutes. The observations of M87 took place over the course of a week - roughly the timescale over which that target varies, meaning the source should not change significantly over that time.
- Second - and this is the reason I've seen cited more often - Sgr A* lies in the center of our galaxy, and so thick clouds of gas and dust lie between it and us. That results in scattering, which is a problem. There are ways to mitigate this, of course, and the team has spent a long time on this, but it's simpler to just look at the black hole that doesn't have that problem in the first place. That's why M87's black hole is an attractive target.
Neither of these are impossible hurdles to overcome, but they're certainly very real difficulties that can't be ignored.
answered Apr 10 at 14:19
HDE 226868♦HDE 226868
21k270130
edited Apr 10 at 20:03
answered Apr 10 at 14:19
HDE 226868♦HDE 226868
21k270130
answered Apr 10 at 14:19
HDE 226868♦HDE 226868
21k270130
answered Apr 10 at 14:19
HDE 226868♦HDE 226868
21k270130
21k270130
1
$begingroup$
I saw multiple reports before hand that it was expected that they'd release images of both. Did that turn out to be nothing more than speculation?
$endgroup$
– curiousdannii
Apr 12 at 4:23
add a comment |
1
$begingroup$
I saw multiple reports before hand that it was expected that they'd release images of both. Did that turn out to be nothing more than speculation?
$endgroup$
– curiousdannii
Apr 12 at 4:23
1
1
$begingroup$
I saw multiple reports before hand that it was expected that they'd release images of both. Did that turn out to be nothing more than speculation?
$endgroup$
– curiousdannii
Apr 12 at 4:23
$begingroup$
I saw multiple reports before hand that it was expected that they'd release images of both. Did that turn out to be nothing more than speculation?
$endgroup$
– curiousdannii
Apr 12 at 4:23
add a comment |
$begingroup$
I've found an explanation in Dutch here by Heino Falcke, one of the EHT founders. Translation:
Hard to photograph
It was easiest to take a picture of M87. "It is very difficult to photograph the black hole in our Milky Way, because the material around it moves very fast: the vortex rotates around its axis in 20 minutes. Compare it to a toddler who has to sit still for hours to be photographed: that's not possible. With M87, the matter revolves around the hole in two days, so it's easier to photograph", says Falcke.
(The original text is as follows:)
Lastig te fotograferen
Het lukte het beste om een foto te maken van M87. "Het is heel lastig om het zwarte gat in onze Melkweg op de foto te zetten, doordat de materie daaromheen heel snel beweegt: de draaikolk draait in 20 minuten om zijn as. Vergelijk het met een kleuter die urenlang stil moet zitten om op de foto te gaan: dat gaat niet. Bij M87 draait de materie in twee dagen om het gat heen, dus dat is makkelijker te fotograferen", zegt Falcke.
answered Apr 10 at 14:03
GlorfindelGlorfindel
2,3642927
$endgroup$
2
$begingroup$
Are you sure about the "matter revolves around the hole in two days" part ? I've heard the event horizon has roughly a diameter of 100 billions km, and even at speed close to c that's about 2 weeks for a complete revolution
$endgroup$
– Keelhaul
Apr 11 at 12:38
$begingroup$
I'm just quoting one of the people involved in the project, I haven't verified his statements ...
$endgroup$
– Glorfindel
Apr 11 at 12:39
$begingroup$
The Schwarzchild radius of the M87 black hole is about 20 billion km.
$endgroup$
– Steve Linton
Apr 12 at 12:27
add a comment |
$begingroup$
I've found an explanation in Dutch here by Heino Falcke, one of the EHT founders. Translation:
Hard to photograph
It was easiest to take a picture of M87. "It is very difficult to photograph the black hole in our Milky Way, because the material around it moves very fast: the vortex rotates around its axis in 20 minutes. Compare it to a toddler who has to sit still for hours to be photographed: that's not possible. With M87, the matter revolves around the hole in two days, so it's easier to photograph", says Falcke.
(The original text is as follows:)
Lastig te fotograferen
Het lukte het beste om een foto te maken van M87. "Het is heel lastig om het zwarte gat in onze Melkweg op de foto te zetten, doordat de materie daaromheen heel snel beweegt: de draaikolk draait in 20 minuten om zijn as. Vergelijk het met een kleuter die urenlang stil moet zitten om op de foto te gaan: dat gaat niet. Bij M87 draait de materie in twee dagen om het gat heen, dus dat is makkelijker te fotograferen", zegt Falcke.
answered Apr 10 at 14:03
GlorfindelGlorfindel
2,3642927
$endgroup$
2
$begingroup$
Are you sure about the "matter revolves around the hole in two days" part ? I've heard the event horizon has roughly a diameter of 100 billions km, and even at speed close to c that's about 2 weeks for a complete revolution
$endgroup$
– Keelhaul
Apr 11 at 12:38
$begingroup$
I'm just quoting one of the people involved in the project, I haven't verified his statements ...
$endgroup$
– Glorfindel
Apr 11 at 12:39
$begingroup$
The Schwarzchild radius of the M87 black hole is about 20 billion km.
$endgroup$
– Steve Linton
Apr 12 at 12:27
add a comment |
$begingroup$
I've found an explanation in Dutch here by Heino Falcke, one of the EHT founders. Translation:
Hard to photograph
It was easiest to take a picture of M87. "It is very difficult to photograph the black hole in our Milky Way, because the material around it moves very fast: the vortex rotates around its axis in 20 minutes. Compare it to a toddler who has to sit still for hours to be photographed: that's not possible. With M87, the matter revolves around the hole in two days, so it's easier to photograph", says Falcke.
(The original text is as follows:)
Lastig te fotograferen
Het lukte het beste om een foto te maken van M87. "Het is heel lastig om het zwarte gat in onze Melkweg op de foto te zetten, doordat de materie daaromheen heel snel beweegt: de draaikolk draait in 20 minuten om zijn as. Vergelijk het met een kleuter die urenlang stil moet zitten om op de foto te gaan: dat gaat niet. Bij M87 draait de materie in twee dagen om het gat heen, dus dat is makkelijker te fotograferen", zegt Falcke.
answered Apr 10 at 14:03
GlorfindelGlorfindel
2,3642927
$endgroup$
I've found an explanation in Dutch here by Heino Falcke, one of the EHT founders. Translation:
Hard to photograph
It was easiest to take a picture of M87. "It is very difficult to photograph the black hole in our Milky Way, because the material around it moves very fast: the vortex rotates around its axis in 20 minutes. Compare it to a toddler who has to sit still for hours to be photographed: that's not possible. With M87, the matter revolves around the hole in two days, so it's easier to photograph", says Falcke.
(The original text is as follows:)
Lastig te fotograferen
Het lukte het beste om een foto te maken van M87. "Het is heel lastig om het zwarte gat in onze Melkweg op de foto te zetten, doordat de materie daaromheen heel snel beweegt: de draaikolk draait in 20 minuten om zijn as. Vergelijk het met een kleuter die urenlang stil moet zitten om op de foto te gaan: dat gaat niet. Bij M87 draait de materie in twee dagen om het gat heen, dus dat is makkelijker te fotograferen", zegt Falcke.
answered Apr 10 at 14:03
GlorfindelGlorfindel
2,3642927
answered Apr 10 at 14:03
GlorfindelGlorfindel
2,3642927
answered Apr 10 at 14:03
GlorfindelGlorfindel
2,3642927
answered Apr 10 at 14:03
GlorfindelGlorfindel
2,3642927
2,3642927
2
$begingroup$
Are you sure about the "matter revolves around the hole in two days" part ? I've heard the event horizon has roughly a diameter of 100 billions km, and even at speed close to c that's about 2 weeks for a complete revolution
$endgroup$
– Keelhaul
Apr 11 at 12:38
$begingroup$
I'm just quoting one of the people involved in the project, I haven't verified his statements ...
$endgroup$
– Glorfindel
Apr 11 at 12:39
$begingroup$
The Schwarzchild radius of the M87 black hole is about 20 billion km.
$endgroup$
– Steve Linton
Apr 12 at 12:27
add a comment |
2
$begingroup$
Are you sure about the "matter revolves around the hole in two days" part ? I've heard the event horizon has roughly a diameter of 100 billions km, and even at speed close to c that's about 2 weeks for a complete revolution
$endgroup$
– Keelhaul
Apr 11 at 12:38
$begingroup$
I'm just quoting one of the people involved in the project, I haven't verified his statements ...
$endgroup$
– Glorfindel
Apr 11 at 12:39
$begingroup$
The Schwarzchild radius of the M87 black hole is about 20 billion km.
$endgroup$
– Steve Linton
Apr 12 at 12:27
2
2
$begingroup$
Are you sure about the "matter revolves around the hole in two days" part ? I've heard the event horizon has roughly a diameter of 100 billions km, and even at speed close to c that's about 2 weeks for a complete revolution
$endgroup$
– Keelhaul
Apr 11 at 12:38
$begingroup$
Are you sure about the "matter revolves around the hole in two days" part ? I've heard the event horizon has roughly a diameter of 100 billions km, and even at speed close to c that's about 2 weeks for a complete revolution
$endgroup$
– Keelhaul
Apr 11 at 12:38
$begingroup$
I'm just quoting one of the people involved in the project, I haven't verified his statements ...
$endgroup$
– Glorfindel
Apr 11 at 12:39
$begingroup$
I'm just quoting one of the people involved in the project, I haven't verified his statements ...
$endgroup$
– Glorfindel
Apr 11 at 12:39
$begingroup$
The Schwarzchild radius of the M87 black hole is about 20 billion km.
$endgroup$
– Steve Linton
Apr 12 at 12:27
$begingroup$
The Schwarzchild radius of the M87 black hole is about 20 billion km.
$endgroup$
– Steve Linton
Apr 12 at 12:27
add a comment |
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Related question - Why not take a picture of a closer black hole?
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– BruceWayne
Apr 11 at 15:06