Most distant galaxy cluster revealed

Discussion in 'Astronomy, Exobiology, & Cosmology' started by Lucas, Mar 2, 2005.

  1. Lucas Registered Senior Member

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  3. Lucas Registered Senior Member

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    The people of the paper says that the cluster lies at a distance of 9 Gly, but they don't indicate what kind of distance. I suppose that they mean comoving distance, but I'm not sure. Anybody knows the redshift of this cluster? I could transform the redshift to comoving distance, that is the distance that I like more
     
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  5. blobrana Registered Senior Member

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    The word on the street....
    Red shift 1.4
     
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  7. Lucas Registered Senior Member

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    blobrana, you're the man
    Ok introducing this cipher in Ned Wright's calculator
    http://www.astro.ucla.edu/~wright/CosmoCalc.html
    for a universe with H=71, Omega-matter=0.27, Omega-Lambda=0.73, flat, it gives me a comoving distance of 13.7 Gly
    It gives also two other distances (luminosity and angular size) that don't mach either with the 9 Gly of the article.
    Ummmm. I'm always suspicious of distances given in popular articles....
     
  8. blobrana Registered Senior Member

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    Hum,

    <font color=pink>< must bookmark ></font>
    neat link...

    Hum did you use `flat`?
    the `light travel time` is shown as 9.061 Gyr.
    While the `comoving radial distance` is shown as 13.728 Gly.

    ( the links explain the difference)

    <font color=pink>< /must bookmark ></font>
     
  9. Lucas Registered Senior Member

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    yeah comoving radial distance is the same as comoving distance. Perhaps they were mentioning the light travel time in the article, though is a kind of measure rarely used in articles. Well
    I used flat. The Universe is flat. Omega=1.
     
  10. Lucas Registered Senior Member

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  11. blobrana Registered Senior Member

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    Hum,
    yeah,
    i think it the main point with the new cluster was that they were `highly structured` or `highly evolved` after only a few billion years. The galaxies in the cluster are red and elliptical, which means that they are quite `old`...

    A puzzle indeed.
     

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