The colour evolution of high-redshift radio galaxies

Details The colour evolution of high-redshift radio galaxies The colour evolution of high-redshift radio galaxies

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.240..257d&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 240, Sept. 15, 1989, p. 257-284.

Astronomy and Astrophysics

Astronomy

37

Color, Continuous Radiation, Galactic Evolution, Radio Galaxies, Red Shift, Astronomical Models, Elliptical Galaxies, Spectrophotometry, Stellar Evolution

Scientific paper

The observed colors of about 70 radio galaxies were compared with the predictions of new evolutionary synthesis models in order to study the optical-to-infrared continuum radiation from radio galaxies at large redshifts. It is found that while the bulk of objects at z of greater than 1 are very red in R-K, for the case of most galaxies apparently consistent with passive evolution corresponding to formation redshifts of greater than 5, all high-redshift objects are active in B-R. These observations are consistent with a model in which the old and young stellar populations are decoupled. In this model, the majority of stars are formed at z of much greater than 2, and even the most passive galaxies experience continuing low-level star formation thereafter.

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