Sgr A Relativistic Jets Visible?

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SUMMARY

The discussion centers on the visibility of potential relativistic jets emitted by the supermassive black hole Sgr A* at the center of the Milky Way. While the jets could theoretically be visible from Earth if they were large and bright enough, current conditions do not favor such an event, as Sgr A* has not been actively consuming significant amounts of matter recently. Evidence from Chandra and VLA data suggests the existence of jets, but the likelihood of seeing them without telescopes in the near future is low. Future visibility may increase during the Milky Way's merger with the Andromeda galaxy in approximately one billion years.

PREREQUISITES
  • Understanding of supermassive black holes, specifically Sgr A*
  • Familiarity with relativistic jets and their formation
  • Knowledge of astronomical observation techniques, including the use of Chandra and VLA data
  • Basic concepts of galaxy mergers and their implications for cosmic events
NEXT STEPS
  • Research the mechanisms behind relativistic jet formation in supermassive black holes
  • Explore the capabilities and findings of the Chandra X-ray Observatory
  • Learn about the implications of galaxy mergers, particularly between the Milky Way and Andromeda
  • Investigate the visibility of astronomical phenomena with and without telescopes
USEFUL FOR

Astronomers, astrophysics students, and anyone interested in the dynamics of black holes and cosmic events.

D English
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Hello,

Question: If Sgr A were to emit relativistic jets, say... to a 90 degree angle from what we see as the Milky Way, how visible would that be to us on Earth?

The pictures I see on the internet suggest that the jets are about twice as long as galaxies themselves. This makes me think that the light-show would be tremendous.
 
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It's a little difficult to find such jets because they're only emitted while the black hole is gobbling up matter, and the supermassive black hole at the center of our galaxy hasn't been doing much of that lately. However, there is some evidence of jets from combining Chandra and VLA data:
http://www.chandra.harvard.edu/photo/2013/sgra/
 
Thanks Chalnoth!

I should have been more clear. I mean, would we see the jets in our sky?

For example, if Sgr A were doing this:

https://upload.wikimedia.org/wikipedia/commons/d/d2/ESO_Centaurus_A_LABOCA.jpg

ESO_Centaurus_A_LABOCA.jpg
 
Last edited:
D English said:
Thanks Chalnoth!

I should have been more clear. I mean, would we see the jets in our sky?

For example, if Sgr A were doing this:

https://upload.wikimedia.org/wikipedia/commons/d/d2/ESO_Centaurus_A_LABOCA.jpg

ESO_Centaurus_A_LABOCA.jpg
Do you mean would it be visible with the unaided eye? Certainly if the jets were large and bright enough, we could see them without telescopes and in visible light. But it seems pretty unlikely that this will happen for the Milky Way any time soon, as it requires a huge amount of matter falling into the black hole to make for a show like the one in the above picture. Maybe there will be some visible jets created when the Milky Way merges with Andromeda in a billion years or so.
 

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