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Is the UV Alignment Effect Present in Low Redshift Radio Galaxies?

Published online by Cambridge University Press:  25 May 2016

Andrea Cimatti  and
Sperello Di Serego Alighieri
Andrea Cimatti
Affiliation:
Osservatorio Astrofisico di Arcetri Largo E. Fermi 5, I–50125, Firenze, Italy
Sperello Di Serego Alighieri
Affiliation:
Osservatorio Astrofisico di Arcetri Largo E. Fermi 5, I–50125, Firenze, Italy

Extract

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When a FRII radio galaxy at z > 0.7 is observed in the optical, its continuum appears extended and aligned with the radio axis. This phenomenon occurs actually when the optical bands start to sample the rest-frame UV, and it was called alignment effect (McCarthy et al. 1987). The UV continuum of high z radio galaxies shows also strong linear polarization due to scattering of anisotropic radiation escaping from the obscured quasar nucleus (di Serego Alighieri, Cimatti & Fosbury 1994). However, the observations of the UV continuum have been concentrated mostly on high z radio galaxies, leaving open a main question : is the alignment effect an evolutionary phenomenon present only at high z, or is it simply a selection effect due to the K-correction ? In order to investigate the origin and evolution of the UV alignment effect, we have started a ground-based imaging and polarimetric survey for studying the UV continuum in FR II radio galaxies with 0.1 < z < 0.5. Depending on the redshift, the filters U and B can be used to sample the UV continuum free from strong emission lines, and in the same rest-frame spectral region observed in radio galaxies at higher redshift. The survey is in progress and here we present only our first results.

Type
Relation between Radio and Other Wavelenghts
Information
Symposium - International Astronomical Union , Volume 175: Extragalactic Radio Sources , 1996 , pp. 234 - 235
Copyright
Copyright © Kluwer 1996 

References

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