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J/MNRAS/190/205 Magnetic fields in radio sources (Clarke+ 1980) ================================================================================ Evidence for the magnetic-field orientation in extragalactic radio sources Clarke J.N., Kronberg P.P, Simard-Normandin M.=1980MNRAS.190..205C ================================================================================ Keywords: radio sources: radio galaxies - polarisation: rotation measures Abstract: The difference, dPA, between the structural and polarization position angles has been measured for 209 extragalactic radio sources. For highly-polarized sources the distribution of dPA shows clear peaks at PA=90 and 0 deg, with very few sources at intermediate values of dPA. As the polarization decreases, the distribution becomes smeared out, and the peak at PA=0d quickly disappears. The correlation between radio luminosity and dPA, seen by Haves & Conway (1975MNRAS.173P..53H), is much stronger for highly-polarized sources. Sources with maximum polarization >=11% and PA~90 or ~0d are almost always classical doubles with narrow, collinear structure, while sources with lower p_max OR intermediate PA tend to have off-axis structure. The investigation of this large sample suggests that magnetic fields within tails and bridges in radio sources may always be symmetrical about the radio trails, even for sources with low polarization and off-axis structure. File Summary: -------------------------------------------------------------------------------- FileName Lrecl Records Explanations -------------------------------------------------------------------------------- ReadMe 80 . This file table1 35 219 Observed orientations of radio sources -------------------------------------------------------------------------------- See also: R440 Faraday Rotation Measures of Extragalactic Radio Sources (Simard-Normandin+ 1981) Byte-by-byte Description of file: table1 -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 1- 7 A7 --- Name IAUname (B1950) 8 A1 --- s_flag [ *] *: source excluded from statistical sample 10- 17 A8 --- Cname Common name 20- 23 F4.1 perc Pmax maximum integrated polarization percentage as function of wavelength 26- 28 I3 degs chi0 intrinsic polarization position angle 30- 32 I3 degs rPA position angle of most elongated radio structure 34- 35 I2 degs dPA |chi0-dPA|, always the acute angle -------------------------------------------------------------------------------- History: Prepared via OCR by Heinz Andernach (heinz@astro.ugto.mx). ================================================================================ (End) Heinz Andernach [Guanajuato, Mexico] 02-Nov-1997