The Galactic Underworld: The Milky Way’s Sea of Dormant Black Holes - Kareem El-Badry - 12/08/2023
2.7 هزار بار بازدید -
8 ماه پیش
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There are ~100 million black
There are ~100 million black holes lurking throughout the Milky Way, but how do we detect them and how do they affect their surroundings? Join us for a 30-minute lecture investigating dormant black holes, followed by a panel Q&A consisting of several astrophysicists to answer your questions about astrophysics and space science. Timestamps below:
00:00 Announcements
06:29 Intro to Black Holes Presentation
07:52 Black Holes Presentation
38:45 Q&A for Black Holes Presentation
39:00 "Do you know the distribution of masses of black holes?"
40:32 "What is the theoretical minimum mass of a black hole?"
42:09 "Are black holes uniformly distributed through space?"
44:08 "How do black hole jets get ejected from black holes?"
46:00 "Does black holes have different orientations?"
48:33 Intermission
52:24 Q&A Panel Introductions
56:07 "What happens if a small black hole meets a big star?"
58:08 "What software do you use with black hole datasets?"
1:00:50 "How close would a rogue black hole get for us to detect it?"
1:03:30 "Are black holes preferentially located near our galactic center?"
1:05:04 "Why is Andromeda Galaxy's supermassive black hole so much bigger than ours?"
1:08:35 "How could we use Voyager's orbit to constrain nearby black holes?"
1:10:39 "Do we know of any galaxies that do not have supermassive black holes?"
1:12:48 "Are black holes just point masses? Are stars?"
1:14:50 "What is the relationship between supernovae and black holes?"
1:20:14 "Do the black holes orbit like the stars in the galaxy?"
1:22:20 "Are black holes dark matter?"
1:24:17 "What are the sizes of supermassive black holes?"
1:25:25 "How far out can black holes be kicked out of a galaxy?"
1:27:24 "What would it take for a human to see inside a black hole?"
1:28:42 "Why are supernova interesting?"
1:31:22 "How close of a supernova is dangerous for us?"
1:35:05 "When Milky Way and Andromeda merge, what will be our black hole's mass?
1:37:13 "How unstable are white holes if they exist?"
1:43:37 "Can merging black holes produce new elements?"
1:47:44 "Is Uranium the heaviest element observed in nature?"
1:49:11 "Can we observationally detect Hawking Radiation?"
1:51:19 "Does a black hole make a noise?"
1:54:58 "What made you want to go into astronomy?"
1:59:55 "Why are we able to observe black holes so much more frequently than before?"
2:06:14 Concluding Remarks
*Apologies for the poor sound during the presentation. There were problems with the microphone being sensitive enough to pick things up. Please use the sub-title option in YouTube to get the full transcript.
Title: The Galactic Underworld: The Milky Way’s Sea of Dormant Black Holes
Speaker: Kareem El-Badry
Abstract:
About 100 million black holes are thought to lurk in the Milky Way. The vast majority of these black holes — which are corpses of long-dead generations of massive stars — emit no detectable light and only very rarely interact with their surroundings. I will describe how astronomers know this vast population of quiet black holes exists and how large-scale surveys of the Milky Way are beginning to detect the black holes' gravitational effects. I will also discuss relation between these nearby black holes and those being discovered by gravitational wave detectors.
Poster Photo Credit: NASA Goddard
00:00 Announcements
06:29 Intro to Black Holes Presentation
07:52 Black Holes Presentation
38:45 Q&A for Black Holes Presentation
39:00 "Do you know the distribution of masses of black holes?"
40:32 "What is the theoretical minimum mass of a black hole?"
42:09 "Are black holes uniformly distributed through space?"
44:08 "How do black hole jets get ejected from black holes?"
46:00 "Does black holes have different orientations?"
48:33 Intermission
52:24 Q&A Panel Introductions
56:07 "What happens if a small black hole meets a big star?"
58:08 "What software do you use with black hole datasets?"
1:00:50 "How close would a rogue black hole get for us to detect it?"
1:03:30 "Are black holes preferentially located near our galactic center?"
1:05:04 "Why is Andromeda Galaxy's supermassive black hole so much bigger than ours?"
1:08:35 "How could we use Voyager's orbit to constrain nearby black holes?"
1:10:39 "Do we know of any galaxies that do not have supermassive black holes?"
1:12:48 "Are black holes just point masses? Are stars?"
1:14:50 "What is the relationship between supernovae and black holes?"
1:20:14 "Do the black holes orbit like the stars in the galaxy?"
1:22:20 "Are black holes dark matter?"
1:24:17 "What are the sizes of supermassive black holes?"
1:25:25 "How far out can black holes be kicked out of a galaxy?"
1:27:24 "What would it take for a human to see inside a black hole?"
1:28:42 "Why are supernova interesting?"
1:31:22 "How close of a supernova is dangerous for us?"
1:35:05 "When Milky Way and Andromeda merge, what will be our black hole's mass?
1:37:13 "How unstable are white holes if they exist?"
1:43:37 "Can merging black holes produce new elements?"
1:47:44 "Is Uranium the heaviest element observed in nature?"
1:49:11 "Can we observationally detect Hawking Radiation?"
1:51:19 "Does a black hole make a noise?"
1:54:58 "What made you want to go into astronomy?"
1:59:55 "Why are we able to observe black holes so much more frequently than before?"
2:06:14 Concluding Remarks
*Apologies for the poor sound during the presentation. There were problems with the microphone being sensitive enough to pick things up. Please use the sub-title option in YouTube to get the full transcript.
Title: The Galactic Underworld: The Milky Way’s Sea of Dormant Black Holes
Speaker: Kareem El-Badry
Abstract:
About 100 million black holes are thought to lurk in the Milky Way. The vast majority of these black holes — which are corpses of long-dead generations of massive stars — emit no detectable light and only very rarely interact with their surroundings. I will describe how astronomers know this vast population of quiet black holes exists and how large-scale surveys of the Milky Way are beginning to detect the black holes' gravitational effects. I will also discuss relation between these nearby black holes and those being discovered by gravitational wave detectors.
Poster Photo Credit: NASA Goddard
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