Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...234...20g&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 234, no. 1-2, Aug. 1990, p. 20-22.
Astronomy and Astrophysics
Astrophysics
5
Galactic Clusters, Radio Galaxies, Red Shift, Astronomical Photometry, Astronomical Spectroscopy, Carbon, Cosmology, Faint Objects, Magnesium
Scientific paper
The discovery of a probable galaxy cluster core associated with the radio sources 3 C 255 is reported. The redshift of the brightest object (V = 23.4) based on C III 1909, C II 2326, and Mg II 2799 is z = 1.355. Six objects with similar color index, V-R = 0.5-0.7, and magnitudes ranging from V = 23.4 to 24.9 are found in a circle of 6 arcsec in radius from the radio galaxy, suggesting that the system is a very distant aggregate of galaxies, the radio source being associated with the first ranked object. It is found that the objects are very small compared with what is expeced from the projection of the largest Virgo galaxies in a q0 = 0.5 space. It is suggested that the objects may have been smaller in the past, or that the case q0 = 0.5 may be not an adequate representation of the universe.
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