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Thread: Life and times of a black hole

  1. #201
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    here is another really big one.!

    "If we had this monster sitting at the centre of our Milky Way galaxy, it would appear 10 times brighter than a full moon. It would appear as an incredibly bright pin-point star that would almost wash out all of the stars in the sky."

    Dr Wolf said the energy emitted from this newly discovered supermassive black hole, also known as a quasar, was mostly ultraviolet light but also radiated x-rays.

    "Again, if this monster was at the centre of the Milky Way it would likely make life on Earth impossible with the huge amounts of x-rays emanating from it," he said.
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  • #202
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    Tytower obviously missed Allover's post of the same black hole.

    This black hole is ~20 billion solar masses @ ~2 billion years old.
    Ton618 is ~60 billion solar masses @ ~4 billion years old.
    S5 0014+81 ~40 billion solar masses @ ~4 billion years old.
    H1821+643 ~30 billion solar masses @ ~10 billion years old.
    H1821+643 ~20 billion solar masses @ ~13 billion years old.

    So while this is only a very small sample size, there is a general trend in quasar (black hole) sizes. The big ones are really far away, in the early universe.
    There are a lot more smaller supermassive black holes closer (later) in the universe.

    The obvious question is how such black holes can get so big so fast?
    The less obvious is why there aren't any that big in the universe now?
    Most nearby quasar and SMBH's are about 1 billion solar masses.
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