<p>The video <div class="youtube-embed"><div>
                <iframe width="640px" height="395px" src="https://www.youtube.com/embed/BtnFwNKEmyY?start=902"></iframe>
            </div></div> discusses exactly this question around the 15 minute mark. The newly published results seem to favour an inclination between the spin axis of Sgr A* and the Fermi bubbles of about 60°. Some possible implications of this mismatch:</p>
<ul>
<li><p>Sgr A* was previously aligned with the Fermi bubbles, but changed orientation since then. For example due to a merger with another galaxy.</p>
</li>
<li><p>Fermi bubbles might have been caused by some spherical phenomenon, but we only see them in the less dense parts outside of the galactic disc.</p>
</li>
<li><p>Fermi bubbles might have some other origin.</p>
</li>
</ul>

CC BY-SA 4.0
2022-05-16T13:54:36.987Z
2022-05-16T13:54:36.987Z
samcarter_is_at_topanswers.xyz
<p>The EHT just announced their great findings about Sgr A*, amongst other cool things they found that we look towards the black hole face on which means that if there is a jet it approximately looks into our direction.</p>
<p>Does this match one of the theories for Fermi bubbles, that they might have formed from the jets of Sgr A* or does the new information about the orientation rules this out?</p>

CC BY-SA 4.0
2022-05-13T09:16:03.253Z
Are we looking towards it or are we seeing a distorted image like in this image from NASA https://www.sciencealert.com/this-new-nasa-visualisation-of-a-black-hole-is-so-beautiful-we-could-cry
Dave Gremlin
CC BY-SA 4.0
2022-05-13T09:22:42.243Z
In https://doi.org/10.3847/2041-8213/ac6674 they say high inclination models fail, so looking towards us is probable.
astronerd
CC BY-SA 4.0
2022-05-13T10:08:48.983Z
From that paper "All edge-on (high inclination) models fail the combined set of EHT-only constraints..."  so high inclination in this case means edge-on.  Well I've learned something new today!  Thanks for that, and for linking to that paper.
Dave Gremlin
<event-horizon-telescope><sagittarius-a>
Does the newly found orientation of Sgr A* match the theory that the Fermi bubbles might have been caused by jets?
astronerd
# Does the newly found orientation of Sgr A* match the theory that the Fermi bubbles might have been caused by jets?

(Asked by: username_0 on 2022-05-12)

The EHT just announced their great findings about Sgr A\*, amongst other cool things they found that we look towards the black hole face on which means that if there is a jet it approximately looks into our direction.

Does this match one of the theories for Fermi bubbles, that they might have formed from the jets of Sgr A\* or does the new information about the orientation rules this out?

**Tags:** event-horizon-telescope, sagittarius-a

> **Comments:**
> **username_1**: Are we looking towards it or are we seeing a distorted image like in this image from NASA https://www.sciencealert.com/this-new-nasa-visualisation-of-a-black-hole-is-so-beautiful-we-could-cry  
> **username_0**: In https://doi.org/10.3847/2041-8213/ac6674 they say high inclination models fail, so looking towards us is probable.  
> **username_1**: From that paper "All edge-on (high inclination) models fail the combined set of EHT-only constraints..."  so high inclination in this case means edge-on.  Well I've learned something new today!  Thanks for that, and for linking to that paper.  

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## 1 answers

### Answer by username_2 on 2022-05-16. Score: 3

The videodiscusses exactly this question around the 15 minute mark. The newly published results seem to favour an inclination between the spin axis of Sgr A\* and the Fermi bubbles of about 60°. Some possible implications of this mismatch:

* Sgr A\* was previously aligned with the Fermi bubbles, but changed orientation since then. For example due to a merger with another galaxy.
* Fermi bubbles might have been caused by some spherical phenomenon, but we only see them in the less dense parts outside of the galactic disc.
* Fermi bubbles might have some other origin.


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