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The UV Component in Distant Radio Galaxies

from I - Evidence and Implications of Anisotropy in AGN

Published online by Cambridge University Press:  04 August 2010

By
A. Cimatti ,
S. di Serego Alighieri  and
R.A.E. Fosbury
Edited by
Andrew Robinson  and
Roberto Juan Terlevich
A. Cimatti
Affiliation:
Dipartimento di Astronomia e Scienza dello Spazio, Largo E. Fermi 5, I–50125, Firenze, Italy.
S. di Serego Alighieri
Affiliation:
Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I–50125, Firenze, Italy.
R.A.E. Fosbury
Affiliation:
Space Telescope European Coordinating Facility, Karl-Scwarzschild Str. 2, D–8046, Garching bei München, Germany.
Andrew Robinson
Affiliation:
University of Cambridge
Roberto Juan Terlevich
Affiliation:
Royal Greenwich Observatory, Cambridge
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Summary

Abstract

We analyse the properties of a sample of polarized radio galaxies with a wide range of redshifts. Our results suggest that a large fraction of UV light in distant radio galaxies is scattered anisotropic nuclear radiation.

Introduction

High redshift radio galaxies (HZRGs) have elongated morphologies (emission lines and continuum) aligned with the radio axis. The alignment of the continuum is strong in the ultraviolet and weak in the infrared around 1µ (rest frame) [2]. While the IR round component can be explained with an evolved stellar population, the nature of the UV aligned component is still a matter of debate. Two origins have been proposed for the UV light : (a) star formation induced in the ISM by the radio jet (b) dust/electron scattering of anisotropic nuclear light. We present new data which show that at least a considerable fraction of the UV light is not stellar.

The sample and the correlations

We have collected a sample of 41 radio galaxies with 0.1≤z≤1.2 taken from our survey ([1]) and from the literature. We find that the degree of linear polarization P increases with redshift and with the total radio power at 178 MHz (Pr), while it decreases with the rest frame wavelength of the observation (λrest). The main problem in the interpretation of these correlations is that the quantities z−Pr−λrest are interdependent and it is not possible to clarify which correlations are intrinsic and which derived.

Type
Chapter
Information
The Nature of Compact Objects in Active Galactic Nuclei
Proceedings of the 33rd Herstmonceux Conference, held in Cambridge, July 6-22, 1992
 , pp. 88 - 89
Publisher: Cambridge University Press
Print publication year: 1994

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  • The UV Component in Distant Radio Galaxies
    • By A. Cimatti, Dipartimento di Astronomia e Scienza dello Spazio, Largo E. Fermi 5, I–50125, Firenze, Italy., S. di Serego Alighieri, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I–50125, Firenze, Italy., R.A.E. Fosbury, Space Telescope European Coordinating Facility, Karl-Scwarzschild Str. 2, D–8046, Garching bei München, Germany.
  • Edited by Andrew Robinson, University of Cambridge, Roberto Juan Terlevich, Royal Greenwich Observatory, Cambridge
  • Book: The Nature of Compact Objects in Active Galactic Nuclei
  • Online publication: 04 August 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511564765.021
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  • The UV Component in Distant Radio Galaxies
    • By A. Cimatti, Dipartimento di Astronomia e Scienza dello Spazio, Largo E. Fermi 5, I–50125, Firenze, Italy., S. di Serego Alighieri, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I–50125, Firenze, Italy., R.A.E. Fosbury, Space Telescope European Coordinating Facility, Karl-Scwarzschild Str. 2, D–8046, Garching bei München, Germany.
  • Edited by Andrew Robinson, University of Cambridge, Roberto Juan Terlevich, Royal Greenwich Observatory, Cambridge
  • Book: The Nature of Compact Objects in Active Galactic Nuclei
  • Online publication: 04 August 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511564765.021
Available formats
×

Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • The UV Component in Distant Radio Galaxies
    • By A. Cimatti, Dipartimento di Astronomia e Scienza dello Spazio, Largo E. Fermi 5, I–50125, Firenze, Italy., S. di Serego Alighieri, Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I–50125, Firenze, Italy., R.A.E. Fosbury, Space Telescope European Coordinating Facility, Karl-Scwarzschild Str. 2, D–8046, Garching bei München, Germany.
  • Edited by Andrew Robinson, University of Cambridge, Roberto Juan Terlevich, Royal Greenwich Observatory, Cambridge
  • Book: The Nature of Compact Objects in Active Galactic Nuclei
  • Online publication: 04 August 2010
  • Chapter DOI: https://doi.org/10.1017/CBO9780511564765.021
Available formats
×