J/PASJ/55/351 ATCA observations of 202 compact radio sources (Tingay+, 2003)
ATCA monitoring observations of 202 compact radio sources in support of the VSOP AGN survey. Tingay S.J., Jauncey D.L., King E.A., Tzioumis A.K., Lovell J.E.J., Edwards P.G. <Publ. Astron. Soc. Jap., 55, 351-384 (2003)> =2003PASJ...55..351T
ADC_Keywords: Active gal. nuclei ; Radio sources ; Polarization ; Interferometry Keywords: galaxies: active - radio continuum: galaxies - surveys - technique: interferometric Abstract: The Australia Telescope Compact Array (ATCA) has been used in support of the VLBI Space Observatory Programme (VSOP) space VLBI mission, to monitor the total and polarised flux densities of 202 objects that make up 83% of the VSOP all-sky Survey of compact extragalactic radio sources south of DE=+10°. The primary goal of the ATCA observations is to provide information on the total and polarised emission from the compact components in these sources, for correlation with parameters obtained from VSOP imaging observations. These data represent the first high resolution, long timescale flux density monitoring observations of a large number of southern compact radio sources. In the future, comparison of the ATCA and VSOP data will be used to investigate relativistic beaming models and identify similarities or differences between the major classes of extragalactic radio sources. As an illustration of the scientific value of the ATCA data we undertake a comparison of the properties of the gamma-ray loud and gamma-ray quiet AGN in the southern component of the VSOP Survey sample, finding that in a flat-spectrum sub-sample the gamma-ray loud AGN are more variable than the gamma-ray quiet AGN. Description: Observations of 202 radio sources from the VSOP Survey sample (Hirabayashi et al., 2000, Cat. J/PASJ/52/997) were made over a 3.5 year period with the ATCA (table 1) in the 8.6, 4.8, 2.5, and 1.4GHz bands. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table2.dat 38 17 Approximate flux densities and spectral indices for the 17 sources dropped from the ATCA monitoring. table3.dat 91 185 Mean flux densities, variability indices, mean percentage linear polarisations, mean spectral indices, and structure flags for the 185 (=202-17) VSOP Survey sources monitored with the ATCA.
See also: J/PASJ/52/997 : VSOP 5 GHz AGN Survey (Hirabayashi+, 2000) J/ApJS/131/95 : VSOP 5 GHz continuum survey (Fomalont+, 2000) J/ApJS/155/33 : VSOP 5 GHz AGN Survey. III (Scott+, 2004) J/ApJ/616/110 : VSOP 5 GHz AGN Survey. IV (Horiuchi+, 2004) Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 10 A10 --- VSOP Source name (JHHMM+DDMM) 12- 15 F4.2 Jy <I8.6> Mean flux density at 8.6GHz 17- 20 F4.2 Jy <I4.8> Mean flux density at 4.8GHz 22- 25 F4.2 Jy <I2.5> Mean flux density at 2.5GHz 27- 30 F4.2 Jy <I1.4> Mean flux density at 1.4GHz 32- 36 F5.2 --- <SI> Mean spectral index between 4.8 and 8.6GHz 38 A1 --- Flag [ce] Flag about radio structure (G1)
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 10 A10 --- VSOP Source name (JHHMM+DDMM) 12- 16 F5.2 Jy <I8.6> Mean flux density at 8.6GHz 18- 22 F5.2 Jy <I4.8> Mean flux density at 4.8GHz 24- 28 F5.2 Jy <I2.5> Mean flux density at 2.5GHz 30- 34 F5.2 Jy <I1.4> Mean flux density at 1.4GHz 37- 40 F4.2 --- M8.6 Total flux density variability index at 8.6GHz (1) 42- 45 F4.2 --- M4.8 Total flux density variability index at 4.8GHz (1) 47- 50 F4.2 --- M2.5 Total flux density variability index at 2.5GHz (1) 52- 55 F4.2 --- M1.4 Total flux density variability index at 1.4GHz (1) 57 A1 --- l_<m8.6> Limit flag on <m8.6> 58- 62 F5.2 % <m8.6> Mean percentage linear polarisation at 8.6GHz 64 A1 --- l_<m4.8> Limit flag on <m4.8> 65- 68 F4.2 % <m4.8> Mean percentage linear polarisation at 4.8GHz 70 A1 --- l_<m2.5> Limit flag on <m2.5> 71- 75 F5.2 % <m2.5> Mean percentage linear polarisation at 2.5GHz 77 A1 --- l_<m1.4> Limit flag on <m1.4> 78- 81 F4.2 % <m1.4> Mean percentage linear polarisation at 1.4GHz 83- 87 F5.2 --- <SI> Mean spectral index between 4.8 and 8.6GHz 91 A1 --- Flag [cel] Flag about radio structure (G1)
Note (1): The variability index is defined as the RMS variation from the mean flux density, divided by the mean flux density. It should be noted that over the period of these observations, significant radio frequency interference (RFI) was present in the 2.5GHz band at the ATCA, and to a lesser extent in the 1.4GHz band. The RFI in the 2.5GHz data has been removed as much as possible by careful editing but some of the scatter in the visibility amplitudes for some sources at some times at this frequency may be due to residual RFI in the data.
Global notes: Note (G1): Flags have the following meaning: c = highly compact structure, little evidence for structure on baselines less than 6km in length e = significantly extended structure at a majority of frequencies and on baselines less than 6km in length l = evidence for extended structure mainly at 1.4GHz or 2.5GHz, with the source appearing to be more compact at the higher frequencies
History: * 13-Feb-2004: From electronic version of the journal * 18-Aug-2005: table3, the following names were corrected (to be coherent with the VSOP catalog by Hirabayashi et al., 2000PASJ...52..997H, Cat. J/PASJ/52/997) - J1647-6438 replaced by J1647-6437 - J1932-4536 replaced by J1932-4546
(End) James Marcout, Patricia Bauer [CDS] 13-Feb-2004
|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|