Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.211..833l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 211, Dec. 15, 1984, p. 833-855.
Astronomy and Astrophysics
Astronomy
330
Infrared Astronomy, Radio Astronomy, Radio Galaxies, Red Shift, Star Distribution, Elliptical Galaxies, Hertzsprung-Russell Diagram, Stellar Color, Stellar Magnitude, Stellar Spectrophotometry
Scientific paper
A homogeneous data set of infrared observations of 83 3CR galaxies with redshifts 0 < z < 1.6, selected from a statistically complete sample of 90 radio sources, is used to study the colours and magnitudes of these galaxies as a function of their redshifts. It is shown that the infrared colours do not deviate from the predicted relations with redshift for a standard giant elliptical galaxy spectrum, indicating that the Giant Branch is basically unchanged at redshifts of unity. The optical to infrared colours, however, show substantial deviations at high redshift. No galaxies have been found that are significantly redder than a passively evolving galaxy, and there is a significant scatter of colours bluewards from this model. The excess of ultraviolet light responsible for these colours is not concentrated at the nucleus, and is interpreted as resulting from bursts of star formation throughout the galaxy that may be associated with the radio activity.
Lilly Simon J.
Longair Malcolm S.
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