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J/ApJ/589/733       VLBI polarimetry of CJF sources          (Pollack+, 2003)

VLBI polarimetry of 177 sources from the Caltech-Jodrell Bank Flat-Spectrum Survey. Pollack L.K., Taylor G.B., Zavala R.T. <Astrophys. J. 589, 733 (2003)> =2003ApJ...589..733P
ADC_Keywords: Radio sources ; Galaxies, radio ; QSOs ; Polarization Keywords: galaxies: active - galaxies: jets - galaxies: nuclei - polarization - quasars: general - radio continuum: galaxies Abstract: We present Very Long Baseline Array observations and a statistical analysis of 5GHz VLBI polarimetry data from 177 sources in the Caltech-Jodrell Bank Flat-Spectrum (CJF) survey. The CJF survey, a complete, flux density-limited sample of 293 extragalactic radio sources, gives us the unique opportunity to compare a broad range of source properties for quasars, galaxies, and BL Lacertae objects. We focus primarily on jet properties, specifically, the correlation between the jet axis angle and the polarization angle in the core and jet. A strong correlation is found for the electric vector polarization angle in the cores of quasars to be perpendicular to the jet axis. Contrary to previous claims, no correlation is found between the jet polarization angle and the jet axis in either quasars or BL Lac objects. With this large, homogeneous sample we are also able to investigate cosmological issues and active galactic nucleus evolution. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 92 177 Measured Source Properties
See also: J/ApJS/98/1 : First Caltech-Jodrell Bank VLBI Survey. I. (Polatidis+ 1995) J/ApJS/98/33 : First Caltech-Jodrell Bank VLBI Survey. II. (Thakkar+ 1995) J/ApJS/99/297 : First Caltech-Jodrell Bank VLBI Survey. III (Xu+ 1995) J/ApJS/95/345 : Second Caltech-Jodrell Bank VLBI Survey. I. (Taylor+ 1994) J/ApJS/100/1 : Second Caltech-Jodrell Bank VLBI Survey. II. (Henstock+ 1995) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Source B1950.0 source name (HHMM+DDd) 10- 11 I2 h RAh Right ascension (J2000.0) 13- 14 I2 min RAm Right ascension (J2000.0) 16- 21 F6.3 s RAs Right ascension (J2000.0) 23 A1 --- DE- Declination sign (J2000.0) 24- 25 I2 deg DEd Declination (J2000.0) 27- 28 I2 arcmin DEm Declination (J2000.0) 30- 35 F6.3 arcsec DEs Declination (J2000.0) 37 A1 --- Epoch [ABC] Epoch of observation (1) 39 A1 --- Parent [EP12] Parent sample (2) 41- 42 A2 --- Class [QGBLO ] Class (3) 44 A1 --- n_Class [njc] Sub-classification (4) 47- 49 I3 deg Theta ? Jet axis angle 51- 54 I4 mJy Icore Total intensity at the core 56- 57 A2 --- l_Pcore [≤ ] Limit flag on Pcore 58- 62 F5.1 mJy Pcore Total polarized intensity at the core (5) 64- 66 I3 deg Chicore ? Electric vector position angle at the core (6) 68- 71 F4.1 mas Length ? Jet length 73- 76 F4.1 mJy Pjet ? Average polarized intensity of detected jet components 78- 79 I2 deg N ? Average difference between jet axis angle and electric vector position angle in detected jet components within 6mas of the core 81- 82 I2 deg F ? Average difference between jet axis angle and electric vector position angle in detected jet components farther than 6mas from the core 84- 87 F4.2 mJy e_Icore Total intensity rms noise 89- 92 F4.2 mJy e_Pcore Polarized intensity rms noise
Note (1): Epoch as follows: A = 1998 B = 1999 C = 2000 Note (2): Parent sample as follows: P = PR; Pearson & Readhead, 1988ApJ...328..114P 1 = first Caltech-Jodrell Bank survey (CJ1; Polatidis et al., 1995, Cat. J/ApJS/98/1) 2 = second Caltech-Jodrell Bank survey (CJ2; Taylor et al., 1994, Cat. J/ApJS/95/345), E = 8 sources not included in PR, CJ1, or CJ2 that complete the Caltech-Jodrell Bank Flat-Spectrum survey Note (3): Class as follows: Q = quasar G = galaxy BL = BL lac object O = Other Note (4): Sub-classification as follows: j = core-jet morphology n = naked core morphology c = compact symmetric object Note (5): Cores with detected polarized intensities have 1σtypical∼0.2mJy Note (6): Cores that meet detection criteria have 1σtypical∼4°
History: From electronic version of the journal
(End) James Marcout, Patricia Bauer [CDS] 26-Sep-2003
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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