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1979Ap&SS..61..153Eichendorf & Reinhardt
1980AcCos...9....7Eichendorf & Reinhardt
VII/6       Polarization of Extragalactic Radio Sources (Eichendorf+ 1980)
=============================================================================
Catalogue of Polarization Measurements and Related Data of Extragalactic Radio
Sources
    Eichendorf W., Reinhardt M.
   
   =1979Ap&SS..61..153E
    Eichendorf W., Reinhardt M.
   =1980AcCos...9....7E
============================================================================
ADC_Keywords: Polarization - 655 ; Galaxies, radio - 320 ; Redshifts - 695 ;
              Galaxy catalogs - 330

Description:
  The catalog contains 510 extragalactic radio sources, and covers all
  polarization measurements from 1965 to the middle of 1974 and a few
  other radio and optical data for these sources. The typical
  observation error was in the range of 1-2 percent in 1965 and 0.5-1
  percent in 1974.  The selection criterion for sources was that
  polarization data should be available at least at three wavelengths
  for each source.  This reduced the sample to 510 sources.  The
  catalog includes observational data: classifications, Cambridge
  numbers, coordinates, degrees of polarization at various
  wavelengths, polarization angles at each wavelength, largest angular
  diameters, position angles, and redshifts. The catalog also includes
  derived data:  rotation measures, linear source diameters,
  polarization angles at wavelength 0 cm, differences between position
  angle and polarization angle at 0 cm, spectral indices between each
  pair of successive wavelengths observed, and polarization indices
  between each pair of successive wavelengths observed.

File Summary:
---------------------------------------------------------------------------
  FileName    Lrecl  Records   Explanations
---------------------------------------------------------------------------
ReadMe           80        .   This file
data.dat        157      510   Observed data 510 extragalactic radio sources
drivquan.dat    141      327   Derived values
datazcor.dat    145      183   Redshift-corrected data
drivzcor.dat    146      183   Redshift-corrected derived values
----------------------------------------------------------------------------
See also:
    J/PASP/97/932 : 3CR Source Identifications (Spinrad 1985)

The observed data:
   File data.dat lists information on 510 objects, one object per record.
   This information is largely observational. In most cases observational
   data were not available at all wavelengths. In all files, whenever
   this is the case, the field will be blank. The first fields
   (bytes 1-16) are identical in all four files.

Byte-by-byte Description of file: data.dat
----------------------------------------------------------------------------
  Bytes  Format  Units  Label       Explanations
----------------------------------------------------------------------------
  1-  2  I2      h      RAh        *Right ascension in hours (B1950)
  3-  4  I2      min    RAm        *RA in minutes
  5      A1      ---    DE-         Sign of Declination
  6-  7  I2      deg    DEd        *Declination in degrees (B1950)
  8- 14  F7.1    ---    3CR        *?Cambridge number
 16      A1      ---    Class      *[GQU] Classification
 17- 23  F7.3    ---    z           ?Redshift
 24- 27  I4      arcsec AngDiam     ?Largest angular diameter
 28- 31  I4      deg    PA         *?Position angle in degrees
 32- 36  F5.1    Jy     S(2cm)      ?Flux dens. at  2   cm
 37- 41  F5.1    Jy     S(3.7cm)    ?Flux dens. at  3.7 cm
 42- 46  F5.1    Jy     S(6cm)      ?Flux dens. at  6   cm
 47- 51  F5.1    Jy     S(11cm)     ?Flux dens. at 11   cm
 52- 56  F5.1    Jy     S(18cm)     ?Flux dens. at 18   cm
 57- 61  F5.1    Jy     S(21cm)     ?Flux dens. at 21   cm
 62- 66  F5.1    Jy     S(31cm)     ?Flux dens. at 31   cm
 67- 71  F5.1    Jy     S(49cm)     ?Flux dens. at 49   cm
 72- 76  F5.1    Jy     S(73cm)     ?Flux dens. at 73   cm
 77- 81  F5.1    %      LP(2cm)     ?Deg. of linear polarization 2 cm in percent
 82- 86  F5.1    %      LP(3.7cm)   ?Deg. of linear polarization 3.7 cm
 87- 91  F5.1    %      LP(6cm)     ?Deg. of linear polarization 6 cm
 92- 96  F5.1    %      LP(11cm)    ?Deg. of linear polarization 11 cm
 97-101  F5.1    %      LP(18cm)    ?Deg. of linear polarization 18 cm
102-106  F5.1    %      LP(21cm)    ?Deg. of linear polarization 21 cm
107-111  F5.1    %      LP(31cm)    ?Deg. of linear polarization 31 cm
112-116  F5.1    %      LP(49cm)    ?Deg. of linear polarization 49 cm
117-121  F5.1    %      LP(73cm)    ?Deg. of linear polarization 73 cm
122-125  I4      deg    PolA(2cm)   ?Pol. angle at  2   cm
126-129  I4      deg    PolA(3.7cm) ?Pol. angle at  3.7 cm
130-133  I4      deg    PolA(6cm)   ?Pol. angle at  6   cm
134-137  I4      deg    PolA(11cm)  ?Pol. angle at 11   cm
138-141  I4      deg    PolA(18cm)  ?Pol. angle at 18   cm
142-145  I4      deg    PolA(21cm)  ?Pol. angle at 21   cm
146-149  I4      deg    PolA(31cm)  ?Pol. angle at 31   cm
150-153  I4      deg    PolA(49cm)  ?Pol. angle at 49   cm
154-157  I4      deg    PolA(73cm)  ?Pol. angle at 73   cm
----------------------------------------------------------------------------
Note on RAh, RAm, DEd:
   Equatorial coordinates (1950.0)
Note on 3CR:
   Cambridge number. From the Revised 3C Catalog of Radio Sources
   (Bennett 1962).
Note on Class:
   One of three, single-letter classification codes:
      G = Radio Galaxy
      Q = Quasar
      U = Unidentified
Note on PA:
   Position angle of the major axis of the object, measured eastward from
   North in degrees.
----------------------------------------------------------------------------

The Derived Values:
   This file (drivquan.dat) contains values derived for those objects of
   the first file with sufficient data to allow one or more of these
   quantities to be calculated.

Byte-by-byte Description of file: drivquan.dat
--------------------------------------------------------------------------------
  Bytes  Format  Units   Label    Explanations
--------------------------------------------------------------------------------
  1-  2  I2      h       RAh      Right ascension in hours (B1950)
  3-  4  I2      min     RAm      RA in minutes
  5      A1      ---     DE-      Sign of Declination
  6-  7  I2      deg     DEd      Declination in degrees (B1950)
  8- 14  F7.1    ---     3CR      ?Cambridge number
 16      A1      ---     Class    [GQU] Classification
 17- 23  F7.1    rad/m2  RM       ?Rotation measure in radians per square meter
 24- 27  I4      deg     PolA    *Pol. angle at 0 cm
 28- 31  I4      deg     PA-PolA *[-180/180]?Pos. angle - pol. angle
 32- 37  F6.2    ---     SI      *? Mean spectral index
 38- 43  F6.2    ---     PI      *? Mean pol. index
 45- 50  F6.2    ---     SI(2)    ?Spec. index, 2-3.7 cm (1)
 51- 56  F6.2    ---     SI(3.7)  ?Spec. index, 3.7-6 cm (1)
 57- 62  F6.2    ---     SI(6)    ?Spec. index, 6 -11 cm (1)
 63- 68  F6.2    ---     SI(11)   ?Spec. index, 11-18 cm (1)
 69- 74  F6.2    ---     SI(18)   ?Spec. index, 18-21 cm (1)
 75- 80  F6.2    ---     SI(21)   ?Spec. index, 21-31 cm (1)
 81- 86  F6.2    ---     SI(31)   ?Spec. index, 31-49 cm (1)
 87- 92  F6.2    ---     SI(49)   ?Spec. index, 49-73 cm (1)
 94- 99  F6.2    ---     PI(2)    ?Pol. index, 2-3.7 cm (2)
100-105  F6.2    ---     PI(3.7)  ?Pol. index, 3.7-6 cm (2)
106-111  F6.2    ---     PI(6)    ?Pol. index, 6 -11 cm (2)
112-117  F6.2    ---     PI(11)   ?Pol. index, 11-18 cm (2)
118-123  F6.2    ---     PI(18)   ?Pol. index, 18-21 cm (2)
124-129  F6.2    ---     PI(21)   ?Pol. index, 21-31 cm (2)
130-135  F6.2    ---     PI(31)   ?Pol. index, 31-49 cm (2)
136-141  F6.2    ---     PI(49)   ?Pol. index, 49-73 cm (2)
----------------------------------------------------------------------------
Note on PolA:
   Linear extrapolation of the angle of polarization at wavelength = 0 cm,
   in degrees.
Note on PA-PolA:
   Difference between the position angle of the source and the polarization
   angle at lambda = 0 cm in degrees.
Note on SI:
   The mean spectral index coefficient, found by regression, of the
   individual spectral indices.
   Note: All of these values were recalculated by the authors of the
   catalog even when accepted values already existed, because of the
   greater amount of data available to them. See Eichendorf and Reinhardt
   (1979) and Eichendorf and Reinhardt (1980) for discussions of how the
   recalculated mean spectral indices compare to the existing data.
Note on PI:
   Analogous to the mean spectral index for flux densities, this is the
   coefficient found by regression from the individual polarization
   indices.
Note (1): SI(*)
   The spectral index SI(*) defined by a power law in the flux density
   function S, where S = frequency . power(SI(*)). Usually SI(*) is
   notated with the greek letter alpha. The spectral index is determined
   only between the available wavelengths.
Note (2): PI(*)
   The polarization index PI(*) is defined as a power law analogous to
   the spectral index for the flux density measurements. The degree of
   polarization,
         P = frequency. power(PI(*)).
   As in the case of the spectral index, PI(*) is defined only between
   certain wavelengths. This quantity was introduced and defined
   by the authors and included in the catalog. See both references
   for details of the derivation, justification, and implications of
   this parameter.
----------------------------------------------------------------------------

The Redshift-Corrected Data (datazcor.dat, File 3 of 4):
   For sources with a known redshift, the catalog authors corrected and
   rederived all wavelength-dependent values from the observed to the
   emitted wavelength. See Eichendorf and Reinhardt (1980) for a brief
   description of the process involved in correcting, interpolating, and
   rederiving values in the same wavelength standard.
   This file lists essentially the same data as the first file, except that
   any wavelength-dependent values have been redshift-corrected to the
   emitted wavelength. A computer program was then used to linearly
   interpolate the results back to the standard wavelengths. There are only
   178 records, one object per record, in this file.

Byte-by-byte Description of file: datazcor.dat
-----------------------------------------------------------------------------
  Bytes  Format  Units   Label      Explanations
----------------------------------------------------------------------------
  1-  2  I2      h       RAh        Right ascension in hours (B1950)
  3-  4  I2      min     RAm        RA in minutes
  5      A1      ---     DE-        Sign of Declination
  6-  7  I2      deg     DEd        Declination in degrees (B1950)
  8- 14  F7.1    ---     3CR        ?Cambridge number
 16      A1      ---     Class      [GQU] Classification
 18- 22  F5.1    %       LP(2cm)    ?Deg. of linear polarization 2 cm in percent
 23- 27  F5.1    %       LP(3.7cm)  ?Deg. of lin. polarization 3.7 cm
 28- 32  F5.1    %       LP(6cm)    ?Deg. of linear polarization 6 cm
 33- 37  F5.1    %       LP(11cm)   ?Deg. of linear polarization 11 cm
 38- 42  F5.1    %       LP(18cm)   ?Deg. of linear polarization 18 cm
 43- 47  F5.1    %       LP(21cm)   ?Deg. of linear polarization 21 cm
 48- 52  F5.1    %       LP(31cm)   ?Deg. of linear polarization 31 cm
 53- 57  F5.1    %       LP(49cm)   ?Deg. of linear polarization 49 cm
 58- 62  F5.1    %       LP(73cm)   ?Deg. of linear polarization 73 cm
 64- 67  I4      deg     PolA(2cm)  ?Pol. angle at  2   cm
 68- 71  I4      deg   PolA(3.7cm)  ?Pol. angle at  3.7 cm
 72- 75  I4      deg     PolA(6cm)  ?Pol. angle at  6   cm
 76- 79  I4      deg     PolA(11cm) ?Pol. angle at 11   cm
 80- 83  I4      deg     PolA(18cm) ?Pol. angle at 18   cm
 84- 87  I4      deg     PolA(21cm) ?Pol. angle at 21   cm
 88- 91  I4      deg     PolA(31cm) ?Pol. angle at 31   cm
 92- 95  I4      deg     PolA(49cm) ?Pol. angle at 49   cm
 96- 99  I4      deg     PolA(73cm) ?Pol. angle at 73   cm
101-105  F5.1    Jy      S(2cm)     ?Flux dens. at  2   cm
106-110  F5.1    Jy      S(3.7cm)   ?Flux dens. at  3.7 cm
111-115  F5.1    Jy      S(6cm)     ?Flux dens. at  6   cm
116-120  F5.1    Jy      S(11cm)    ?Flux dens. at 11   cm
121-125  F5.1    Jy      S(18cm)    ?Flux dens. at 18   cm
126-130  F5.1    Jy      S(21cm)    ?Flux dens. at 21   cm
131-135  F5.1    Jy      S(31cm)    ?Flux dens. at 31   cm
136-140  F5.1    Jy      S(49cm)    ?Flux dens. at 49   cm
141-145  F5.1    Jy      S(73cm)    ?Flux dens. at 73   cm
----------------------------------------------------------------------------
The Redshift-Corrected Derived Values (drivzcor.dat, File 4 of 4):
   This file is analogous to File 2 of derived values for the
   redshift-corrected data of File 3. In addition, knowing the redshift and
   angular diameter, the additional parameter of linear source diameter was
   calculated. The model used was an open Friedmann universe with vanishing
   density, assuming the Hubble constant H=55 km/sec/Mpc
   See Eichendorf and Reinhardt (1980) for details of this calculation and
   a discussion of how redshift correction was applied and the results
   interpolated to determine both the spectral and polarization indices in
   the standard wavelengths chosen.

Byte-by-byte Description of file: drivzcor.dat
-----------------------------------------------------------------------------
  Bytes  Format  Units   Label    Explanations
----------------------------------------------------------------------------
  1-  2  I2      h       RAh      Right ascension in hours (B1950)
  3-  4  I2      min     RAm      RA in minutes
  5      A1      ---     DE-      Sign of Declination
  6-  7  I2      deg     DEd      Declination in degrees (B1950)
  8- 14  F7.1    ---     3CR      ?Cambridge number
 16      A1      ---     Class    [GQU] Classification
 17- 22  F6.2    Mpc     Diam     *? Lin. source diam.
 23- 28  F6.1    rad/m2  RM       *?Rotation measure in radians per square meter
 29- 32  I4      deg     PolA     ?Pol. angle at 0 cm
 33- 36  I4      deg     PA-PolA  [-180/180]?Pos. angle - pol. angle
 37- 42  F6.2    ---     SI       ? Mean spectral index
 43- 48  F6.2    ---     PI       ? Mean pol. index
 50- 55  F6.2    ---     SI(2)    ?Spec. index, 2-3.7 cm
 56- 61  F6.2    ---     SI(3.7)  ?Spec. index, 3.7-6 cm
 62- 67  F6.2    ---     SI(6)    ?Spec. index, 6 -11 cm
 68- 73  F6.2    ---     SI(11)   ?Spec. index, 11-18 cm
 74- 79  F6.2    ---     SI(18)   ?Spec. index, 18-21 cm
 80- 85  F6.2    ---     SI(21)   ?Spec. index, 21-31 cm
 86- 91  F6.2    ---     SI(31)   ?Spec. index, 31-49 cm
 92- 97  F6.2    ---     SI(49)   ?Spec. index, 49-73 cm
 99-104  F6.2    ---     PI(2)    ?Pol. index, 2-3.7 cm
105-110  F6.2    ---     PI(3.7)  ?Pol. index, 3.7-6 cm
111-116  F6.2    ---     PI(6)    ?Pol. index, 6 -11 cm
117-122  F6.2    ---     PI(11)   ?Pol. index, 11-18 cm
123-128  F6.2    ---     PI(18)   ?Pol. index, 18-21 cm
129-134  F6.2    ---     PI(21)   ?Pol. index, 21-31 cm
135-140  F6.2    ---     PI(31)   ?Pol. index, 31-49 cm
141-146  F6.2    ---     PI(49)   ?Pol. index, 49-73 cm
----------------------------------------------------------------------------
Note on Diam:
   Line source diameter. In Mpc. See Eichendorf and Reinhardt (1980) for
   details of how this was derived.
Note on RM:
   Rotation measure. Derived from the redshift-corrected values, in
   radians per square meter.
---------------------------------------------------------------------------

Remarks and Modifications:
   The Catalog of Polarization Measurements and Related Data of
   Extragalactic Radio Sources was sent to the Astronomical Data Center
   (ADC), NASA Goddard Space Flight Center, by the Centre de Donnees
   Astronomiques, Strasbourg (CDS), in July 1980.
   The original tape contained four text files formatted in the same manner
   as in the published catalog. The catalog was so well formatted that
   essentially no editing was required.

Acknowledgements:
   The original ADC documentation by Theresa A. Nagy (1979) was used to
   generate this ReadMe file.

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================================================================================
(End)                        C.-H. Joseph Lyu [Hughes STX/NASA]      05-Apr-1996