Evidence that the Z = 3.4 radio galaxy B2 0902+34 may be a protogalaxy

Details Evidence that the Z = 3.4 radio galaxy B2 0902+34 may be a protogalaxy Evidence that the Z = 3.4 radio galaxy B2 0902+34 may be a protogalaxy

May 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993natur.363..140e&link_type=abstract

Nature (ISSN 0028-0836), vol. 363, no. 6425, p. 140-142.

Physics

40

Galactic Evolution, Radio Galaxies, Elliptical Galaxies, Red Shift, Spectral Energy Distribution, Star Formation

Scientific paper

It is usually assumed that the red bump in the monochromatic luminosities of high-redshift radio galaxies arises from the photospheric emission of red post-main-sequence stars. It is shown here that, at least in the case of the high-redshift radio galaxy B2 0902+34, that the assumption is incorrect: the red bump is caused not by photospheric emission from post-main-sequence stars but rather by the presence of bright emission lines from doubly ionized oxygen. Both the spectrum and the luminosity of the underlying continuum suggest that B2 0902+34 is a galaxy observed during the initial burst of star formation.

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