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J1148+5251 is the most distant object known

  1. Jul 25, 2003 #1
    J1148+5251 is the most distant object known, is a quasar and has a redshift of z=6.41. In its core lies the most massive black hole known, a moster of 3 billion solar masses. Now, astronomers have discovered that the first stars of this quasars started to form 650 million years after Big Bang
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  3. Jul 25, 2003 #2


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    That J1148+5251 quasar is 28 billion lightyears away

    Exciting news, especially about the carbon and oxygen-containing gas cloud around the hole---evidence of a prior generation of stars during the brief 870 million years since time zero.

    I plugged your figure of z = 6.41 into Ned Wright's Cosmic Calculator
    and it told me that we see the quasar at a time 870 million years after zero,
    and that the light travel time was 12.8 billion years,
    and that the present distance to the quasar is 28 billion light years.
  4. Jul 25, 2003 #3
    I've done a quick search and have found that this quasar is situated in the constellation of Ursa Major
  5. Jul 25, 2003 #4


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    Bravo and thanks, meteor,
    it is a pleasure to have a rough idea where important things in are in the sky
    I will think of it tonight if I see the Great Bear

    At Ned Wright's cosmology tutorial he has news of a quasar
    with z = 6.4 posted since about November 2002. The astronomer reporting the quasar was Bob Becker. It could be the same quasar? What is new, in the report you linked us to, is the carbon/oxygen containing cloud of gas----evidence of earlier stars? Or is the quasar itself a recent find?
  6. Jul 25, 2003 #5
    Is the same quasar. I knew of it from time ago, but when it was announced they didn't gave a name for it . Now I'm glad to at least knowing what name it has
    The second most distant object known is the quasar J1030+0524, with a redshift z=6.28, and situated in the constellation of Sextans
  7. Jul 25, 2003 #6


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    It would seem that the name J1148+5251
    tells the position in the the sky
    11 hours 48 minutes RA and +52 degrees
    which is indeed in Ursa Major

    There is also a star with a jupiter-size planet
    in that constellation as I recall
    so it has several associations
    besides the main one with bears

    edit: that direction to that quasar is marked by the star gammaUMa which is the one below where the handle joins onto
    the dipper
    Last edited: Jul 25, 2003
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