Why was M87 targetted for the Event Horizon Telescope instead of Sagittarius A*? The 2019 Stack Overflow Developer Survey Results Are InHow is the mass of black hole at the center of our galaxy measured?Understanding Black hole information paradox?Geometry inside the event horizonWhat happens to the wavelength/frequency of a photon as it passes through an event horizon?Why the center of our galaxy doesn't absorb us?How Can Anything Escape A Supermassive Black Hole?Are black holes in a binary system with white holes, and are they both wormholes?Observer inside event horizon of an extremely large black holeIs it possible the space-time manifold itself could stop at a black hole's event horizon?Picture of Sgr A*
Multiply Two Integer Polynomials
If I score a critical hit on an 18 or higher, what are my chances of getting a critical hit if I roll 3d20?
Do these rules for Critical Successes and Critical Failures seem Fair?
Identify This Plant (Flower)
Why is the maximum length of OpenWrt’s root password 8 characters?
Origin of "cooter" meaning "vagina"
Falsification in Math vs Science
Did Section 31 appear in Star Trek: The Next Generation?
What to do when moving next to a bird sanctuary with a loosely-domesticated cat?
If a Druid sees an animal’s corpse, can they wild shape into that animal?
Why hard-Brexiteers don't insist on a hard border to prevent illegal immigration after Brexit?
Why didn't the Event Horizon Telescope team mention Sagittarius A*?
Deal with toxic manager when you can't quit
Is an up-to-date browser secure on an out-of-date OS?
Apparent duplicates between Haynes service instructions and MOT
STM32 programming and BOOT0 pin
Earliest use of the term "Galois extension"?
Can you compress metal and what would be the consequences?
Did Scotland spend $250,000 for the slogan "Welcome to Scotland"?
What is the meaning of the verb "bear" in this context?
FPGA - DIY Programming
Should I use my personal e-mail address, or my workplace one, when registering to external websites for work purposes?
Why can Shazam fly?
Where to refill my bottle in India?
Why was M87 targetted for the Event Horizon Telescope instead of Sagittarius A*?
The 2019 Stack Overflow Developer Survey Results Are InHow is the mass of black hole at the center of our galaxy measured?Understanding Black hole information paradox?Geometry inside the event horizonWhat happens to the wavelength/frequency of a photon as it passes through an event horizon?Why the center of our galaxy doesn't absorb us?How Can Anything Escape A Supermassive Black Hole?Are black holes in a binary system with white holes, and are they both wormholes?Observer inside event horizon of an extremely large black holeIs it possible the space-time manifold itself could stop at a black hole's event horizon?Picture of Sgr A*
$begingroup$
First image of a black hole has been released today April 10th, 2019. The team targeted the black hole at the center of the M87 galaxy.
Why didn't the team target the Sagittarius A* at the center of our own galaxy. Intuitively, it would seem to be a better target as it is closer to us.
black-holes astronomy event-horizon
edited 7 hours ago
Qmechanic♦
107k121991240
asked 7 hours ago
MaxterMaxter
1279
$endgroup$
add a comment |
$begingroup$
First image of a black hole has been released today April 10th, 2019. The team targeted the black hole at the center of the M87 galaxy.
Why didn't the team target the Sagittarius A* at the center of our own galaxy. Intuitively, it would seem to be a better target as it is closer to us.
black-holes astronomy event-horizon
edited 7 hours ago
Qmechanic♦
107k121991240
asked 7 hours ago
MaxterMaxter
1279
$endgroup$
4
$begingroup$
Related question on Astronomy Stack Exchange: astronomy.stackexchange.com/q/30313/2153.
$endgroup$
– HDE 226868
7 hours ago
$begingroup$
On the EHT website it says that there was too much activity at A* to get a good picture
$endgroup$
– Halbeard
4 hours ago
add a comment |
$begingroup$
First image of a black hole has been released today April 10th, 2019. The team targeted the black hole at the center of the M87 galaxy.
Why didn't the team target the Sagittarius A* at the center of our own galaxy. Intuitively, it would seem to be a better target as it is closer to us.
black-holes astronomy event-horizon
edited 7 hours ago
Qmechanic♦
107k121991240
asked 7 hours ago
MaxterMaxter
1279
$endgroup$
First image of a black hole has been released today April 10th, 2019. The team targeted the black hole at the center of the M87 galaxy.
Why didn't the team target the Sagittarius A* at the center of our own galaxy. Intuitively, it would seem to be a better target as it is closer to us.
black-holes astronomy event-horizon
black-holes astronomy event-horizon
edited 7 hours ago
Qmechanic♦
107k121991240
asked 7 hours ago
MaxterMaxter
1279
edited 7 hours ago
Qmechanic♦
107k121991240
asked 7 hours ago
MaxterMaxter
1279
edited 7 hours ago
Qmechanic♦
107k121991240
edited 7 hours ago
Qmechanic♦
107k121991240
edited 7 hours ago
Qmechanic♦
107k121991240
107k121991240
asked 7 hours ago
MaxterMaxter
1279
asked 7 hours ago
MaxterMaxter
1279
asked 7 hours ago
MaxterMaxter
1279
1279
4
$begingroup$
Related question on Astronomy Stack Exchange: astronomy.stackexchange.com/q/30313/2153.
$endgroup$
– HDE 226868
7 hours ago
$begingroup$
On the EHT website it says that there was too much activity at A* to get a good picture
$endgroup$
– Halbeard
4 hours ago
add a comment |
4
$begingroup$
Related question on Astronomy Stack Exchange: astronomy.stackexchange.com/q/30313/2153.
$endgroup$
– HDE 226868
7 hours ago
$begingroup$
On the EHT website it says that there was too much activity at A* to get a good picture
$endgroup$
– Halbeard
4 hours ago
4
4
$begingroup$
Related question on Astronomy Stack Exchange: astronomy.stackexchange.com/q/30313/2153.
$endgroup$
– HDE 226868
7 hours ago
$begingroup$
Related question on Astronomy Stack Exchange: astronomy.stackexchange.com/q/30313/2153.
$endgroup$
– HDE 226868
7 hours ago
$begingroup$
On the EHT website it says that there was too much activity at A* to get a good picture
$endgroup$
– Halbeard
4 hours ago
$begingroup$
On the EHT website it says that there was too much activity at A* to get a good picture
$endgroup$
– Halbeard
4 hours ago
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
Of course they targeted Sgr A* as well.
I think though that this is a more difficult target to get good images of.
The black hole is about 1500 times less massive than in M87, but is about 2000 times closer. So the angular scale of the event horizons should be similar. However Sgr A* is a fairly dormant black hole and may not be illuminated so well, and there is more scattering material between us and it than in M87.
A bigger problem may be variability timescales. The black hole in M87 is light days across, so images can be combined across several days of observing. Sgr A* is light minutes across, so rapid variability could be a problem.
answered 6 hours ago
Rob JeffriesRob Jeffries
70.7k7144245
$endgroup$
$begingroup$
I was going to protest this answer, but now just have a catch to add. In some places (looking at you, Veritasium) a simulated image of SgrA* is easy to mistake as a genuine photo. Now I understand why SgrA* isn't even in the press release. The circulating SgrA* image is just a simulation. See source material and comments section: youtu.be/VnsZj9RvhFU
$endgroup$
– World Outsider
1 hour ago
$begingroup$
I'd intuitively think that dust in the disk of our galaxy plays a part by obscuring the innermost regions.
$endgroup$
– Allure
48 mins ago
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: "151"
;
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
);
);
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%2fphysics.stackexchange.com%2fquestions%2f471792%2fwhy-was-m87-targetted-for-the-event-horizon-telescope-instead-of-sagittarius-a%23new-answer', 'question_page');
);
Post as a guest
Required, but never shown
1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
Of course they targeted Sgr A* as well.
I think though that this is a more difficult target to get good images of.
The black hole is about 1500 times less massive than in M87, but is about 2000 times closer. So the angular scale of the event horizons should be similar. However Sgr A* is a fairly dormant black hole and may not be illuminated so well, and there is more scattering material between us and it than in M87.
A bigger problem may be variability timescales. The black hole in M87 is light days across, so images can be combined across several days of observing. Sgr A* is light minutes across, so rapid variability could be a problem.
answered 6 hours ago
Rob JeffriesRob Jeffries
70.7k7144245
$endgroup$
$begingroup$
I was going to protest this answer, but now just have a catch to add. In some places (looking at you, Veritasium) a simulated image of SgrA* is easy to mistake as a genuine photo. Now I understand why SgrA* isn't even in the press release. The circulating SgrA* image is just a simulation. See source material and comments section: youtu.be/VnsZj9RvhFU
$endgroup$
– World Outsider
1 hour ago
$begingroup$
I'd intuitively think that dust in the disk of our galaxy plays a part by obscuring the innermost regions.
$endgroup$
– Allure
48 mins ago
add a comment |
$begingroup$
Of course they targeted Sgr A* as well.
I think though that this is a more difficult target to get good images of.
The black hole is about 1500 times less massive than in M87, but is about 2000 times closer. So the angular scale of the event horizons should be similar. However Sgr A* is a fairly dormant black hole and may not be illuminated so well, and there is more scattering material between us and it than in M87.
A bigger problem may be variability timescales. The black hole in M87 is light days across, so images can be combined across several days of observing. Sgr A* is light minutes across, so rapid variability could be a problem.
answered 6 hours ago
Rob JeffriesRob Jeffries
70.7k7144245
$endgroup$
$begingroup$
I was going to protest this answer, but now just have a catch to add. In some places (looking at you, Veritasium) a simulated image of SgrA* is easy to mistake as a genuine photo. Now I understand why SgrA* isn't even in the press release. The circulating SgrA* image is just a simulation. See source material and comments section: youtu.be/VnsZj9RvhFU
$endgroup$
– World Outsider
1 hour ago
$begingroup$
I'd intuitively think that dust in the disk of our galaxy plays a part by obscuring the innermost regions.
$endgroup$
– Allure
48 mins ago
add a comment |
$begingroup$
Of course they targeted Sgr A* as well.
I think though that this is a more difficult target to get good images of.
The black hole is about 1500 times less massive than in M87, but is about 2000 times closer. So the angular scale of the event horizons should be similar. However Sgr A* is a fairly dormant black hole and may not be illuminated so well, and there is more scattering material between us and it than in M87.
A bigger problem may be variability timescales. The black hole in M87 is light days across, so images can be combined across several days of observing. Sgr A* is light minutes across, so rapid variability could be a problem.
answered 6 hours ago
Rob JeffriesRob Jeffries
70.7k7144245
$endgroup$
Of course they targeted Sgr A* as well.
I think though that this is a more difficult target to get good images of.
The black hole is about 1500 times less massive than in M87, but is about 2000 times closer. So the angular scale of the event horizons should be similar. However Sgr A* is a fairly dormant black hole and may not be illuminated so well, and there is more scattering material between us and it than in M87.
A bigger problem may be variability timescales. The black hole in M87 is light days across, so images can be combined across several days of observing. Sgr A* is light minutes across, so rapid variability could be a problem.
answered 6 hours ago
Rob JeffriesRob Jeffries
70.7k7144245
edited 6 hours ago
answered 6 hours ago
Rob JeffriesRob Jeffries
70.7k7144245
answered 6 hours ago
Rob JeffriesRob Jeffries
70.7k7144245
answered 6 hours ago
Rob JeffriesRob Jeffries
70.7k7144245
70.7k7144245
$begingroup$
I was going to protest this answer, but now just have a catch to add. In some places (looking at you, Veritasium) a simulated image of SgrA* is easy to mistake as a genuine photo. Now I understand why SgrA* isn't even in the press release. The circulating SgrA* image is just a simulation. See source material and comments section: youtu.be/VnsZj9RvhFU
$endgroup$
– World Outsider
1 hour ago
$begingroup$
I'd intuitively think that dust in the disk of our galaxy plays a part by obscuring the innermost regions.
$endgroup$
– Allure
48 mins ago
add a comment |
$begingroup$
I was going to protest this answer, but now just have a catch to add. In some places (looking at you, Veritasium) a simulated image of SgrA* is easy to mistake as a genuine photo. Now I understand why SgrA* isn't even in the press release. The circulating SgrA* image is just a simulation. See source material and comments section: youtu.be/VnsZj9RvhFU
$endgroup$
– World Outsider
1 hour ago
$begingroup$
I'd intuitively think that dust in the disk of our galaxy plays a part by obscuring the innermost regions.
$endgroup$
– Allure
48 mins ago
$begingroup$
I was going to protest this answer, but now just have a catch to add. In some places (looking at you, Veritasium) a simulated image of SgrA* is easy to mistake as a genuine photo. Now I understand why SgrA* isn't even in the press release. The circulating SgrA* image is just a simulation. See source material and comments section: youtu.be/VnsZj9RvhFU
$endgroup$
– World Outsider
1 hour ago
$begingroup$
I was going to protest this answer, but now just have a catch to add. In some places (looking at you, Veritasium) a simulated image of SgrA* is easy to mistake as a genuine photo. Now I understand why SgrA* isn't even in the press release. The circulating SgrA* image is just a simulation. See source material and comments section: youtu.be/VnsZj9RvhFU
$endgroup$
– World Outsider
1 hour ago
$begingroup$
I'd intuitively think that dust in the disk of our galaxy plays a part by obscuring the innermost regions.
$endgroup$
– Allure
48 mins ago
$begingroup$
I'd intuitively think that dust in the disk of our galaxy plays a part by obscuring the innermost regions.
$endgroup$
– Allure
48 mins ago
add a comment |
Thanks for contributing an answer to Physics 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%2fphysics.stackexchange.com%2fquestions%2f471792%2fwhy-was-m87-targetted-for-the-event-horizon-telescope-instead-of-sagittarius-a%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
4
$begingroup$
Related question on Astronomy Stack Exchange: astronomy.stackexchange.com/q/30313/2153.
$endgroup$
– HDE 226868
7 hours ago
$begingroup$
On the EHT website it says that there was too much activity at A* to get a good picture
$endgroup$
– Halbeard
4 hours ago