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HDE 226868
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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 SagSgr A*, for a couple reasons which the team mentions in their first paper:

  • As Glorfindel said, SagSgr 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 - SagSgr 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.

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 Sag A*, for a couple reasons which the team mentions in their first paper:

  • As Glorfindel said, Sag 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 - Sag 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.

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.

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Source Link
HDE 226868
  • 37.4k
  • 3
  • 130
  • 205

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 Sag A*. As Glorfindel said, Sag A*'s event horizon is much smaller, meaning matter orbiting the black hole has a shorter orbital period. This contributes to variability; if you're observing a target for, say, a week, it's much easier to take an image of something that's not changing over short timescales. I believe M87 is expected to vary on timescales of about a week, not oncouple reasons which the order of days or hours.team mentions in their first paper:

  • As Glorfindel said, Sag 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 - Sag 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.

Second - and this is the reason I've seen cited more often - Sag A* lies in the center of our galaxy, and so thick cloudsNeither of gas and dust lie between it and us. That results in scattering, which is a problem. Therethese are waysimpossible hurdles to mitigate this, of courseovercome, but it's simpler to just look at the black hole that doesn't havethey're certainly very real difficulties that problem in the first place. That's why M87's black hole is an attractive targetcan't be ignored.

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. That said, I'm not wholly surprised that we ended up seeing M87, rather than Sag A*. As Glorfindel said, Sag A*'s event horizon is much smaller, meaning matter orbiting the black hole has a shorter orbital period. This contributes to variability; if you're observing a target for, say, a week, it's much easier to take an image of something that's not changing over short timescales. I believe M87 is expected to vary on timescales of about a week, not on the order of days or hours.

Second - and this is the reason I've seen cited more often - Sag 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, 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.

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 Sag A*, for a couple reasons which the team mentions in their first paper:

  • As Glorfindel said, Sag 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 - Sag 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.

Source Link
HDE 226868
  • 37.4k
  • 3
  • 130
  • 205

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. That said, I'm not wholly surprised that we ended up seeing M87, rather than Sag A*. As Glorfindel said, Sag A*'s event horizon is much smaller, meaning matter orbiting the black hole has a shorter orbital period. This contributes to variability; if you're observing a target for, say, a week, it's much easier to take an image of something that's not changing over short timescales. I believe M87 is expected to vary on timescales of about a week, not on the order of days or hours.

Second - and this is the reason I've seen cited more often - Sag 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, 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.