Observations of a Large Redshift.

Abstract

view Abstract Citations (2) References Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Observations of a Large Redshift. Baum, William A. ; Minkowski, R. Abstract Investigation of radio sources has led Minkowski to the discovery of a very distant cluster of galaxies whose brightest member provides the identification for the radio source 3C295. The spectrum of this galaxy shows a strong emission line of A5447.8. By analogy with the spectrum of Cygnus A the line can only be identified with 0111 A3726/29. The redshift therefore is 0.4614~0.0002. Redshifts above 0.2 can be observed spectroscopically only for obj ects showing strong emission lines, but for all galaxies of normal color they are readily accessible to the method of multicolor photoelectric photometry. Using this method Baum has observed a redshift of 0.44*0.03 for two average galaxies in the central part of the cluster. The agreement with the spectroscopic value proves the validity of the photometric method for the measurement of redshifts of up to 0.5. The present results establish the possibility of reaching redshifts at which cosmological effects are large enough to permit observational discrimination between different cosmological theories. The results, in line with two earlier photometric determinations of redshifts in the range from 0.3 to 0.4 by Baum, favor an exploding universe, but observations of more very distant clusters are needed to determine the relation between redshift and magnitude with adequate accuracy. Publication: The Astronomical Journal Pub Date: 1960 DOI: 10.1086/108083 Bibcode: 1960AJ.....65Q.483B full text sources ADS |