Talk:Stephan's Quintet

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[edit] grouping v clustering

Stephan's Quintet and Hickson Compact Group 92 should be two separate articles, one dealing with the actual physical proximity of HCG92, and the other dealing with the visual proximity of the five galaxies. 132.205.15.4 01:09, 17 Sep 2004 (UTC)

Stephan's Quintet was used as an example by Arp of discordant redshifts. He believes redshift can also be a mesurement of age - increasing redshift sometimes indicates increasing youth. In Stephan's quintet, hydrogen emission patches appear the same size in both low and high redshift members. If high redshift member was conventional distance, HII regions should appear 8 times smaller. He therefore belives NGC 7320 is at the same distance as HicksonCompact group 92 and they are indeed Stephan's Quintet. There is a much bigger redshift discrepancy in Stephan's Quintet than NGC 7320, discovered October 3rd, 2003. There is a high redshift quasar buried in the dusty nucleus of NGC 7319. The nucleus is opaque--nothing shines through it--and yet the redshift of this quasar indicates that it should be billions of light years beyond Stephan's Quintet. More evidence that the quasar is actually within the nucleus of the galaxy: the dust between the quasar and the center of the galaxy is energized and disturbed, with the only apparent cause the quasar itself. However, on the night of October 2, 2003, a group of astronomers took the spectrum of the ULX in the above Hubble Telescope photo of Stephan's Quintet (the ULX is the tiny bright spot indicated by the arrow). That spectrum showed a redshift that identified the ULX as a high redshift quasar, something that belongs far in the background of a big bang universe, but is right where it belongs in an intrinsic redshift universe. Halton Arp, who has been ostracized for 30 years for criticizing the big bang, said, " ... nothing could convey the excitement of sitting in the Keck10 meter control room and seeing that beautiful z = 2.11 [high redshift] spectrum unfold on the screen." This is the most direct evidence yet that the redshift = distance relationship doesn't work. [And without the redshift = distance relationship, the big bang also fails.] Arp concluded that most, if not all, of the ULX's will turn out to be nearby quasars in the process of being ejected from active galaxies.

I read about that too. I just edited based on several sites that were up to date. Onejsin 02:57, 10 March 2006 (UTC)