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2004MNRAS.351..997S - Mon. Not. R. Astron. Soc., 351, 997-1014 (2004/July-1)
VLT spectropolarimetry of two powerful radio galaxies at z ∼ 1.4: ultraviolet continuum, emission-line properties and the nature of high-redshift dust.
SOLORZANO-INARREA C., BEST P.N., ROETTGERING H.J.A. and CIMATTI A.
Abstract (from CDS):
The larger radio source of the two, 0850-206, presents a high continuum fractional polarization, averaging 17 per cent across the observed wavelength range and reaching 24 per cent at rest-frame wavelengths of ≲2000 Å. The smaller radio source, 1303+091, shows a lower continuum polarization, averaging 8 per cent and rising to 11 per cent for rest-frame wavelengths ≳3000 Å. For both galaxies, the position angle of the electric vector is generally constant with wavelength and within ∼15° of perpendicular to the radio axis. Both their total flux spectra and polarized flux spectra reveal the 2200-Ådust feature, and comparison with dust scattering models suggests that the composition of the dust in these galaxies is similar to that of Galactic dust. In 0850-206, scattered quasar radiation dominates the UV continuum emission, with the nebular continuum accounting for no more than ∼22 per cent and no requirement for any additional emission component such as emission from young stars. In contrast, in 1303+091, unpolarized radiation could be a major constituent of the UV continuum emission, with starlight accounting for up to ∼50 per cent and the nebular continuum accounting for ∼11 per cent.
The emission-line properties of the galaxies are also studied from their total intensity spectra. Comparison of the measured emission-line ratios with both shock- and photoionization models shows that the nuclear and extended gas in these galaxies is mainly photoionized by the central active nucleus.
Abstract Copyright: 2004 RAS
Journal keyword(s): polarization - scattering - galaxies: active - galaxies: evolution - galaxies: ISM - radio continuum: galaxies
Simbad objects: 13
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