J/MNRAS/190/205      Magnetic fields in radio sources (Clarke+ 1980)
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Evidence for the magnetic-field orientation in extragalactic radio sources 
    Clarke J.N., Kronberg P.P, Simard-Normandin M.
    
    =1980MNRAS.190..205C
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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:
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  FileName        Lrecl  Records   Explanations
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ReadMe             80        .   This file
table1             35      219   Observed orientations of radio sources
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See also:
      R440  Faraday Rotation Measures of Extragalactic Radio Sources 
            (Simard-Normandin+ 1981)

Byte-by-byte Description of file: table1
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   Bytes Format Units   Label  Explanations
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   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
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History: Prepared via OCR by Heinz Andernach (heinz@astro.ugto.mx). 
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(End)                          Heinz Andernach [Guanajuato, Mexico]  02-Nov-1997