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Ngc 7603

  1. Jan 25, 2012 #1
    This is a galaxy cluster that has an apparent bridge linking it

    Even though the redshifts are very different for different objects within it. What is the most likely explanation for this?
    Last edited by a moderator: Jan 26, 2012
  2. jcsd
  3. Jan 25, 2012 #2


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    To take a completely random guess, I'd say they were background galaxies simply placed in those spots by coincidence.
    Given the much greater redshift value, smaller size and luminosity, and the fact that the filament is approximately the same redshift as NGC 7603, I could believe it.
    But I'm not a professional. The paper linked from the webpage indicates that objects 2 and 3 are emission lines, not absorption lines like the two galaxies are, so I don't know.
    Last edited: Jan 25, 2012
  4. Jan 26, 2012 #3


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    NGC 7603 is one of Arp's oddities cited as 'evidence' redshift as an unreliable distance indicators. I am well aware of this 'anomaly' and it is rubbish.
  5. Jan 26, 2012 #4


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    Can you elaborate on why it is rubbish?
  6. Jan 26, 2012 #5
    Would also like an elaboration
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