SIMBAD references

2003A&A...406..579K - Astronomy and Astrophysics, volume 406, 579-592 (2003/8-1)

Multi-frequency study of the B3-VLA sample. III. Polarisation properties.


Abstract (from CDS):

This paper is the third of a series, and presents the results of the linear polarisation of the B3-VLA sample, at 1.4, 2.7, 4.8 and 10.5GHz. We find that flat-spectrum sources are significantly less polarised than the steep ones at 10.5 GHz. A trend is seen for sources with larger linear size to be more strongly polarised. Compact steep-spectrum sources (CSSs) exhibit much stronger depolarisation than non-CSSs. Flat-spectrum sources are characterized by almost constant, and low, degrees of polarisation over the whole wavelength range studied here. We add 143 new Rotation Measures to the available database published by Wielebinski & Krause (1993A&ARv...4..449W). An important result is that the decrease of the degree of polarisation is almost linear with wavelength and does not drop to zero at lower frequencies. This behaviour cannot be fitted by any existing model of external depolarisation or intrinsic Faraday dispersion. We consider an intrinsic process producing the observed depolarisation, involving three source components with different emissivities and Faraday depths, while the Faraday rotation must arise from a foreground screen, most likely Galactic in origin.

Abstract Copyright:

Journal keyword(s): polarisation - surveys - radio continuum: galaxies

VizieR on-line data: <Available at CDS (J/A+A/406/579): table3.dat table4.dat>

Simbad objects: 192

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