The Galactic Underworld: The Milky Way’s Sea of Dormant Black Holes - Kareem El-Badry - 12/08/2023
ฝัง
- เผยแพร่เมื่อ 24 พ.ค. 2024
- 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 TH-cam 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 - วิทยาศาสตร์และเทคโนโลยี
Very disappointing that the presenter was not provided with a microphone. Made it impossible to hear him legibly
The presenter was using a microphone, but he did not hold it close enough to his face and the sound became distant and distorted. I'll try to add sub-titles so the lecture can still be followed.
Perhaps a ‘lavalier’(clip-on lapel mic) would be easier than handheld microphones. These are very inexpensive and available in wired or wireless.
Hey everyone. As has been noted in some of the comments, the audio is not great for the presentation on this one. I assure you that the speaker was provided with a microphone and we did a sound check, but unfortunately the speaker didn't hold the microphone close enough to his face for it to be a crisp audio recording. The Q&A panel was much clearer audio, though. In the next 24h, I will go through and add sub-titles to the presentation so as to make it more comprehensible to people. Many apologies, and I'll try to avoid this in future events. Thanks for your understanding, team!
Thank you for 2023, Merry Midwinterblot and a Happy New Year! CU in 2024!
Thanks, Zap! Hope you have a good holiday too!
Please ensure there is a mic always for speakers. Online community is not able to participate in this learning outreach opportunity when volume is there but noise cancelation offsets any clarity. Thank you.
The presenter had a microphone, but the presenter was not holding the microphone close to his face during the presentation and thus the audio is somewhat distorted. I'll try to add sub-titles so the lecture can still be followed.
@@CaltechAstro Great, thanks. You’ve spoiled us with your great lecture series program. So now I don’t like missing any of them.
I really wanted to hear this but the audio was terrible
appreciate the effort , but the audio is just dreadful , i tried to listen to the speaker but ended up forwarding to the question and answer bit as it was much easier to understand what was being said...... is there no way to check the quality of the audio before the lecture starts
The audio quality was checked. As you can hear, the audio is fine for my introduction and the subsequent Q&A. The speaker was not holding the microphone near his face, and thus the sound was somewhat distorted. I will try to add sub-titles in the next couple of days.
@@CaltechAstro ok i understand i watch lots of your lectures keep up the good work , thanks
@@harold22774 Sorry about the poor audio. I realize it's not great. I'll try to be better about ensuring the audio is better at future events, and hopefully the sub-titles will help address the issues on this one.
Yes doing a presenter sound check should be standard operating procedure. Anything less would seem to violate the purpose of this outreach program
We did a microphone check, but the presenter was not holding the microphone close to his face during the presentation and thus the audio is somewhat distorted. I'll try to add sub-titles so the lecture can still be followed.
Is there something like electro-gluon discovered yet? If yes, these could potentially be a building block of electrons establishing binding with gluons due to short distance nuclear along with electro-magnetic repulsion and long distance nuclear attraction giving rise to quantum vacuum fluctuations.