Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.297..667n&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 297, Issue 3, pp. 667-686.
Astronomy and Astrophysics
Astronomy
32
Polarization, Instrumentation: Polarimeters, Bl Lacertae Objects: General, Galaxies: Jets, Quasars: General, Radio Continuum: Galaxies
Scientific paper
We present the results of the first survey and monitoring study of the linear polarization properties of compact, flat-spectrum radio sources at mm/submm wavelengths and discuss the implications of the inferred magnetic field structure for the emission models involving shock waves in relativistic jets on subparsec scales. We find significant polarization in most sources but, in general, the magnetic field on subparsec scales is less well ordered than on parsec scales. We observe no difference in polarization properties between the BL Lac objects and compact flat-spectrum quasars at these wavelengths. Although we find the behaviour of some sources, particularly the most highly polarized, to be very consistent with the predictions of transverse shock-in-jet models, the detailed behaviour of most objects is not. Conical shock structures can more readily explain the observed diverse behaviour of the sample, although some degree of bending of the jet may still be necessary in some cases.
Gear Walter K.
Hough James H.
Murray Alexander G.
Nartallo R.
Robson Ian E.
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