Halton Arp 1997 ApJ 474 74 doi:10.1086/303431
Halton Arp1
Show affiliationsMuch print has been dedicated to explaining discordant redshifts in compact groups as unrelated background galaxies. But no one has analyzed the accordant galaxies. It is shown here that when there is a brightest galaxy in the group, the remainder with differences of less than 1000 km s-1 are systematically redshifted. This is the same result as obtained in all other well-defined groups and demonstrates again an increasing intrinsic redshift with fainter luminosity.
Defining discordant redshifts as 1000 km s-1 or greater than the brightest galaxy, it is shown that 76 out of 345, or 22% are discordant, reaching excesses of up to 23,000 km s-1. This large percentage cannot be explained by background contamination because the number of discordances would be expected to increase rapidly with larger excesses, exactly opposite to what is observed in compact groups.
Hickson's logarithmic intensity image of the NGC 1199 group confirms earlier direct evidence from Arp that a peculiar, compact object of 13,300 km s-1 redshift is silhouetted in front of the 2705 km s-1 central galaxy.
galaxies: clusters: general; galaxies: distances and redshifts
Issue 1 (1997 January 1)
Received 1995 December 8, accepted for publication 1996 July 17
Halton Arp 1997 ApJ 474 74
David Kastor and Jennie Traschen 1999 Class. Quantum Grav. 16 1265
G. Papageorgiou and B.J. Schroers JHEP11(2009)009
M A Soldatov et al 2009 J. Phys.: Conf. Ser. 190 012210
A Poole et al 2007 J. Phys.: Condens. Matter 19 452201
F.X. Soldner et al 1994 Nucl. Fusion 34 985
2003 J. Phys. B: At. Mol. Opt. Phys. 36
Peter Dunne 2002 Phys. Educ. 37 211
M S Pindzola et al 2006 J. Phys. B: At. Mol. Opt. Phys. 39 L127
Mitsutoshi Fujita et al JHEP06(2009)066