Science Our Milky Way galaxy's black hole, Sagittarius A*, unmasked

tom_mai78101

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Scientists were aware there was a huge object hidden at the centre of the Milky Way, and they also knew it had no hair. The EHT collaboration has now obtained the very first image of Sagittarius A*, the supermassive black hole at the heart of our Galaxy.

Until now, the presence of Sagittarius A* (Sgr A*) could only be suspected, either from a few radio emissions or by observing the paths of stars orbiting at high speed around a gigantic yet invisible object. The Event Horizon Telescope (EHT) collaboration and its global array of radio telescopes have now obtained an image of the supermassive black hole lurking at the centre of the Milky Way. This is only the second direct image of this type of object ever obtained, following the EHT collaboration's 2019 release of the first-ever image of a black hole, at the centre of the galaxy M87.

“We can now study the differences between these two supermassive black holes to gain valuable new clues about how this important process works,” says Keiichi Asada, an EHT scientist at the Institute of Astronomy and Astrophysics, Academia Sinica, Taipei (Taiwan). “We have images of two black holes – one at the large end and one at the small end of the supermassive black holes in the Universe – so we can go a lot further in testing how gravity behaves in these extreme environments than ever before.”

The bright accretion disk orbiting around the 4.3 million solar masses of Sgr A* at near-light speeds has a diameter equivalent to 30 times that of the Sun, but since it is located 27,000 light years from Earth it appears to be about the same size in the sky as a doughnut on the Moon. Therefore, to obtain this picture, the researchers had to combine the data collected night after night by the EHT's eight telescopes linked together across the planet, and then refine the ‘raw’ images produced using numerical models of black holes. The EHT team's findings are published on 12 May, 2022 in a special issue of the journal The Astrophysical Journal Letters.

 
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  • tom_mai78101 tom_mai78101:
    Hmm, about the Headline News, I noticed threads are being moved into the subforum (Health News, Environmental News, etc.). When that happens, the TH Forum Home page loses the articles, and instead would show old articles posted 1 or 2 weeks ago.
  • tom_mai78101 tom_mai78101:
    What do we do with the Home page?
  • Ghan Ghan:
    I added those forums to the filter for that widget.
    +1
  • tom_mai78101 tom_mai78101:
    Oh nice. They're back. Thanks.
  • tom_mai78101 tom_mai78101:
    Now I think it makes more sense for me to put news in their own subforums, without worry.
  • The Helper The Helper:
    Awesome Ghan thanks! I was purposely not moving the first 15 news articles in Headline news to the different subforums but I guess I don't have to do that now?
  • tom_mai78101 tom_mai78101:
    Question: Is there a way to remove thread redirects? It creates a copy of the moved thread and takes up space, and I am leaning towards wanting to remove them in the Headline News. But if they have an expiration date, I guess I'm fine with it.
  • The Helper The Helper:
    If you move a thread please leave a permanent redirect. You can delete any redirects after 6 months. The redirects are left to help Search Engines find the moved content.
  • tom_mai78101 tom_mai78101:
    What if you move the permanent redirect, not the thread?
  • The Helper The Helper:
    I think that works but I have not messed with it. You can delete redirects though if you have to that will not delete the original thread
  • The Helper The Helper:
    if a redirect ends up in the same forum as the post it goes to though I think the redirect drops or fails or something but they are not bugged out and when you are working on an indirect the original post is safe.
  • The Helper The Helper:
    Happy Early Friday :)
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    Happy Friday :)
  • tom_mai78101 tom_mai78101:
    Fun Friday for me
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    Happy Fun Friday to all.
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    Happy Sunday everyone!!!
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    Happy Sunday!!!
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    Happy monday :p
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    Everyone hates mondays?
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    Happy Tuesday!
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    Happy belated tuesday
  • tom_mai78101 tom_mai78101:
    I found out you can't delete nor hide redirect links to existing threads. It will just stay there. I have no choice now but to start moving thread redirects to News Archive.
  • The Helper The Helper:
    That is not the way that it works for me I can delete redirects you just have to hit refresh sometimes big deletes will take a while as long as moves\
  • The Helper The Helper:
    You don't have to do that you can just leave stuff there in headline news for up to a year it was already down to like 8 months there is no rush.

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