NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-17 T01:39:34 PDT
Help | Comment | NED Home

For refcode 1994ApJ...430...74A:
Retrieve 24 NED objects in this reference.
Please click here for ADS abstract

NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1994ApJ...430...74A COMPANION GALAXIES: A TEST OF THE ASSUMPTION THAT VELOCITIES CAN BE INFERRED FROM REDSHIFTS HALTON ARP Max-Planck-Institut fur Astrophysik, 85740 Garching bei Munchen, Germany Received 1993 January 5; accepted 1994 January 19 ABSTRACT The two nearest, best-studied groups of galaxies, the Local Group and the M81 group, are analyzed. It is shown that 22 out of 22 major companions have redshifts that are positive with respect to the dominant galaxy. The chance that this can be an accidental configuration of velocities is only one in four million. Investigations of more distant groups, including clusters such as Virgo, show that the smaller galaxies characteristically have systematically positive redshifts with respect to the larger ones. No selection effects or contamination are capable of avoiding this result. The "Fingers of God" seen in wedge diagrams of galaxies are shown to give additional evidence against the velocity interpretation of redshifts. Spectra, color, and morphology agree in identifying evolutionary age as the parameter correlated with the excess redshift of the companions. Subject headings: galaxies: clustering - galaxies: distances and redshifts
Retrieve 24 NED objects in this reference.
Please click here for ADS abstract

Back to NED Home