Nature of 60 micron emission in 3C47, 3C207 and 3C334

Details Nature of 60 micron emission in 3C47, 3C207 and 3C334 Nature of 60 micron emission in 3C47, 3C207 and 3C334

1998-03-18

arxiv.org/abs/astro-ph/9803210v1

Astron.Astrophys. 334 (1998) 779

Astronomy and Astrophysics

Astrophysics

7 pages, incl. 3 figures; accepted for publication in A&A

Scientific paper

We try to explain the unusually high far-infrared emission seen by IRAS in the double-lobed radio-loud quasars 3C47, 3C207 and 3C334. High resolution cm--mm observations were carried out to determine their radio core spectra, which are subsequently extrapolated to the far-infrared in order to determine the strength of the synchrotron far-infrared emission. The extrapolated flux densities being considerably lower than the observed values, a significant nonthermal far-infrared component is unlikely in the case of 3C47 and 3C334. However, this component could be responsible for the far-infrared brightness of 3C207. Our analysis demonstrates that nonthermal emission cannot readily account for the difference between quasars and radio galaxies in the amount of their far-infrared luminosity. On the other hand, a significant role for this mechanism is likely; full sampling of the mm-submm spectral energy distributions is needed to address the issue quantitatively.

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