The ages of high-redshift radio galaxies

Details The ages of high-redshift radio galaxies The ages of high-redshift radio galaxies

Jan 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...348l...1c&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 348, Jan. 1, 1990, p. L1-L4.

Astronomy and Astrophysics

Astrophysics

106

Galactic Evolution, Radio Galaxies, Red Shift, Astronomical Models, Spectral Energy Distribution

Scientific paper

The observed spectral energy distributions (SEDs) of high-redshift radio galaxies with stellar population synthesis models were compared. It is shown that the 'flat ultraviolet plus red bump' SED observed in these galaxies can be produced with a normal initial mass function in approximately less than 300 million yr and persists for more than 600 million yr if most of the stars form on time scales of less than 100 million yr. This implies that many of the observed powerful radio galaxies with z = 1-4 are young, and that they are being observed soon after the event that produced the bulk of their stars. If such an event were organized by the powerful radio sources associated with these objects, this could account for the alignment of the optical/infrared emission with the radio axes observed in these sources, while maintaining the low dispersion and continuity of the infrared Hubble diagram.

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