this post was submitted on 08 Feb 2025
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Sagittarius A* Black hole (lemmings.world)
submitted 1 month ago by [email protected] to c/[email protected]
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This is (in my opinion) one of the single biggest achievements of humanity.

Image of Sagittarius A* black hole at center of our Galaxy, taken by Event Horizon Telescope team. This one is also refined with magnetic field lines.

I don't remember what was the exact source for me, but one of the possible ones is https://s3.amazonaws.com/cms.ipressroom.com/173/files/20247/66c7d3d62cfac2492a9bdd54_Sagittarius+A/Sagittarius+A_hero.jpg. I just made it grayscale, some dimming, and resizing, to not cover whole of screen.

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[–] [email protected] 8 points 1 month ago* (last edited 1 month ago) (2 children)

I hope this doesn't ruin a magic moment, but... seems like this image might actually be incorrect. There's a more modern paper in the description of this video that analyses the data with a different approach and they get something that looks quite different.

https://www.youtube.com/watch?v=cdeee7tZ8QY

In any case, one way or the other, we got the correct image of such blackhole now. Just it's not this one.

[–] [email protected] 4 points 1 month ago* (last edited 1 month ago)

I maybe am completely wrong here, but i think this the article https://jasmine.nao.ac.jp/2024_2/EN/press_release_20241025_en.html

In the figure 3, the doppler shift considered seems way to high to me. If i get it correctly, we should be able to see the ring also also from top and bottom, so the center also should be in the plane of us viewing. the simulations seems to be from POV of someone much closer to BH, but we are really far, and then the effect should not be this much evident (I think).

Anyway, it is not necessarily this image that i am fond of. In a abstract sense. we have the raw image data, and just need a good image encoding algorithm to process this data. The fact that we got this raw data is amazing.

[–] [email protected] 3 points 1 month ago

i mean really i feel like it's pretty incorrect to say that either of them is a true correct image, it's not at all what we would see if we looked at it up close.

Both versions show that one side is brighter, and that's about all there is to it at this distance and resolution.

[–] [email protected] 5 points 1 month ago* (last edited 1 month ago) (1 children)

It's bonkers that we have a picture of that. We will never visit it.

[–] [email protected] 5 points 1 month ago (1 children)

We as in humanity may visit it, but we who are alive right now have a really slim chance

[–] [email protected] 2 points 1 month ago (2 children)

well which is it, is it a star or a black hole?
smh

[–] [email protected] 1 points 1 month ago

it is a black hole