U.S. CitiesCity-Data Forum Index
Go Back   City-Data Forum > General Forums > Science and Technology > Space
 [Register]
Please register to participate in our discussions with 2 million other members - it's free and quick! Some forums can only be seen by registered members. After you create your account, you'll be able to customize options and access all our 15,000 new posts/day with fewer ads.
View detailed profile (Advanced) or search
site with Google Custom Search

Search Forums  (Advanced)
 
Old 07-01-2017, 02:24 PM
 
2,710 posts, read 3,001,905 times
Reputation: 1227

Advertisements

Jet streams of gas flow from magnetic fields in accretion disks around some black holes. Do these streams give off light?
Reply With Quote Quick reply to this message

 
Old 07-01-2017, 05:31 PM
 
22,774 posts, read 17,250,171 times
Reputation: 9481
Quote:
Originally Posted by Hazel W View Post
Jet streams of gas flow from magnetic fields in accretion disks around some black holes. Do these streams give off light?
Apparently jet streams can give off visible light according to the following article dated 7 JAN 2016.
''Nothing - including light - can escape a black hole once it’s fallen in, but the process of swallowing gas, dust, or ripping apart whole stars can cause the formation of an accretion disk near the event horizon. These disks can thrust streams of plasma called relativistic jets across the entire length of a galaxy, while hitting temperatures of 10 million degrees Celsius (18 million degrees Fahrenheit) or more.

This insane heat can cause a black hole accretion disk to give off an incredibly bright glow, which is what Kimura and her team observed when they focussed in on V404 Cygni - an active black hole in the Cygnus constellation that reactivated on 15 June 2015 after 26 years of dormancy.''

''Publishing in Nature today, the team hypothesises that the light originates from X-rays produced in the centre of the accretion disk, and these X-rays irradiate and heat up the outer region of the disk, which causes it to emit optical rays.''

Visible light emitted from a black hole has been detected for the first time - ScienceAlert
Reply With Quote Quick reply to this message
 
Old 07-02-2017, 06:45 AM
 
2,710 posts, read 3,001,905 times
Reputation: 1227
Thank you, Mike. Of all the articles I did read, I didn't read that one. There was another that mentioned x-rays and I wondered if they give off visible light. I think, at the time, I was concentrating more on "magnetic field". At any rate, it clears up what had always seemed contradictory to me - the statement that "nothing can escape a black hole - not even light" - and then news that they'd seen light shooting "from a black hole". It's this accretion disk outside the black hole.
Reply With Quote Quick reply to this message
 
Old 07-02-2017, 05:25 PM
 
22,774 posts, read 17,250,171 times
Reputation: 9481
Quote:
Originally Posted by Hazel W View Post
Thank you, Mike. Of all the articles I did read, I didn't read that one. There was another that mentioned x-rays and I wondered if they give off visible light. I think, at the time, I was concentrating more on "magnetic field". At any rate, it clears up what had always seemed contradictory to me - the statement that "nothing can escape a black hole - not even light" - and then news that they'd seen light shooting "from a black hole". It's this accretion disk outside the black hole.
You're welcome Hazel. The Universe is a fascinating place and new discoveries about it are always being made.
Reply With Quote Quick reply to this message
Please register to post and access all features of our very popular forum. It is free and quick. Over $68,000 in prizes has already been given out to active posters on our forum. Additional giveaways are planned.

Detailed information about all U.S. cities, counties, and zip codes on our site: City-data.com.


Reply
Please update this thread with any new information or opinions. This open thread is still read by thousands of people, so we encourage all additional points of view.

Quick Reply
Message:

Over $104,000 in prizes was already given out to active posters on our forum and additional giveaways are planned!

Go Back   City-Data Forum > General Forums > Science and Technology > Space
Similar Threads
Follow City-Data.com founder on our Forum or

All times are GMT -6. The time now is 10:02 AM.

© 2005-2019, Advameg, Inc. · Please obey Forum Rules · Terms of Use and Privacy Policy · Bug Bounty

City-Data.com - Archive 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35 - Top