Infrared and optical morphologies of distant radio galaxies

Details Infrared and optical morphologies of distant radio galaxies Infrared and optical morphologies of distant radio galaxies

Jan 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...385...61r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 385, Jan. 20, 1992, p. 61-82. Research supported by NSERC.

Astronomy and Astrophysics

Astrophysics

105

Galactic Evolution, Infrared Imagery, Light (Visible Radiation), Morphology, Radio Galaxies, Astronomical Photometry, Continuous Radiation, Red Shift

Scientific paper

An analysis is presented of multicolor line and continuum images of a complete sample of 13 3C radio galaxies at redshifts in the range of 0.8 to 1.3, spanning the range 2500 A to 1 m in the rest frame. It is shown that the IR images are less elongated than those at optical wavelengths and exhibit only a much weaker 'alignment effect' with the radio source axis. The quadrupole moments show a progressive reduction from short to long wavelengths, as expected if a symmetric component dominates at IR wavelengths. A spectral decomposition based on these moments suggests that the aligned component has a roughly flat spectral energy distribution in f(nu), while the symmetric red component that dominates in the IR has a spectral energy distribution similar to that of a gE galaxy. In typical 3C galaxies at a redshift of 1, the active aligned component contributes 10 percent of the IR light. While more active objects have a larger contamination, these generally modest components are insufficient to perturb significantly either the scatter in, or the continuity of, the observed K-z relation.

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