Overluminosity of distant radiogalaxies - Evolution or gravitational amplification?

Details Overluminosity of distant radiogalaxies - Evolution or gravitational amplification? Overluminosity of distant radiogalaxies - Evolution or gravitational amplification?

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...169l...1h&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 169, no. 1-2, Nov. 1986, p. L1-L3.

Astronomy and Astrophysics

Astrophysics

25

Astronomical Spectroscopy, Gravitational Lenses, Luminosity, Radio Galaxies, Galactic Evolution, Magnitude, Mass To Light Ratios, Red Shift

Scientific paper

The authors suggest in this letter that the overluminosity of up to 5 magnitudes for distant radiogalaxies observed by Spinrad and Djorgovski (1984, hereafter called SD) may be accounted for by gravitational lensing better than by ad hoc evolution. This is confirmed by a detailed analysis of imagery and spectroscopy available for 4 out of the 13 SD objects. Indeed lens candidates are actually observed around 3C 13, 3C 324, 3C 266 and 3C 238: for all of them large amplification is predicted, and possibly multiple images for the two first of them.

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