Polarimetry of the ultraviolet continua of southern radio galaxies

Details Polarimetry of the ultraviolet continua of southern radio galaxies Polarimetry of the ultraviolet continua of southern radio galaxies

Aug 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995mnras.275..703s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 275, Issue 3, pp. 703-710.

Astronomy and Astrophysics

Astronomy

16

Polarization, Techniques: Polarimetric, Galaxies: Active, Ultraviolet: Galaxies

Scientific paper

This paper reports new B-band polarimetry measurements for four intermediate-redshift (0.3<z<0.7) southern radio galaxies. Deep optical spectra show that three of these objects are broad-line radio galaxies, while the fourth is a narrow-line radio galaxy. Despite the fact that the measurements were made in the rest-frame ultraviolet (UV) in each object, and that emission-line contamination is small, we find that the majority of objects display low intrinsic continuum polarization. In two of the broad-line objects (PKS 1602+01 and PKS 2135-20), this may result from our viewing the broad-line region directly. The significant polarization measure, and corresponding polarization orientation, in the narrow-line object PKS 2250-41 is most consistent with scattering of light from the active nucleus. We therefore identify a diversity of UV polarization properties in powerful radio galaxies at intermediate redshifts. Not all radio galaxies possess large intrinsic polarizations. Therefore the UV excesses observed in these objects are unlikely to result solely from scattered light.

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