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J/ApJS/99/297 First Caltech-Jodrell Bank VLBI Survey. III (Xu+ 1995)
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The First Caltech-Jodrell Bank VLBI Survey. III. VLBI and Merlin Observations
at 5 GHz and VLA Observations at 1.4 GHz
Xu W., Readhead A.C.S., Pearson T.J., Polatidis A.G.,
Wilkinson P.N.
<Astrophys. J. Suppl. Ser. 99, 297 (1995)>
=1995ApJS...99..297X
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ADC_Keywords: QSOs ; Radio sources ; VLBI
Keywords: quasars: general - radio continuum: galaxies - surveys
Abstract:
We present the 5GHz results from the first Caltech-Jodrell Bank
(CJ1) VLBI survey. The 1.6GHz maps were presented in two separate
papers, Polatidis et al. <J/ApJS/98/1> and Thakkar et al.
<J/ApJS/98/33>. These three papers complete the first stage of this
program to map at both 1.6 and 5GHz all objects accessible to Mark II
VLBI in the complete sample of 135 objects with 1.3>S(5Ghz)>=0.7Jy,
Dec(1950)>=35deg, and |b|>10deg. The combination of the CJ1 sample
with the Pearson-Readhead (PR) sample provides a complete, flux
density-limited sample of 200 objects with S(5GHz)>=0.7Jy,
Dec(1950)>=35deg, |b|>10deg for which all of the objects accessible to
Mark II VLBI have been mapped at both 5GHz (129 objects) and 1.6GHz
(132 objects). In addition to the 5GHz VLBI maps, we present in this
paper 5GHz MERLIN observations of 20 objects and 1.4GHz VLA
observations of 92 objects in the combined CJ1 + PR sample. The VLA
maps, together with L-band (1.3-1.7GHz) maps available in the
literature, provide a complete set of VLA maps for the combined CJ1 +
PR sample. Finally, we present the radio spectra of the objects in the
CJ1 sample. The combined CJ1 + PR VLBI surveys provide a sample which
is large enough for a number of important astrophysical and
cosmological studies. These will be presented in further papers in
this series.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2 74 88 VLBI (5GHz) map parameters
table3 64 293 Gaussian models
table4.dat 49 23 MERLIN (5GHz) map parameters
table5.dat 43 94 VLA (1.4GHz) map parameters
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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/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: table2
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Bytes Format Units Label Explanations
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1- 8 A8 --- CJ1 B1950 source name, IAU convention
10- 13 I4 yr OBSy Date of the VLBI observations (year)
15- 16 I2 --- OBSm Date of the VLBI observations (month)
18- 20 A3 --- Sample VLBI sample (CJ1 or PR) the source belongs to
22- 26 F5.2 mas a5GHzn []? FWHM of major axis of the restoring beam
28- 32 F5.2 mas b5GHzn []? FWHM of minor axis of the restoring beam
34- 37 I4 deg PA5GHzn []? Position angle of major axis, N through E
39- 42 I4 mJy S5GHzn []? Peak flux density, naturally weighted map
44- 47 F4.2 mJy e_S5GHzn []? Off source rms, naturally weighted map
49- 53 F5.2 mas a5GHzt []? FWHM of major axis of tapered map
restoring beam
55- 59 F5.2 mas b5GHzt []? FWHM of minor axis of tapered map
restoring beam
61- 64 I4 deg PA5GHzt []? Position angle of major axis, N through E
66- 69 I4 mJy S5GHzt []? Peak flux density, tapered map
71- 74 F4.2 mJy e_S5GHzt []? Off source rms, tapered map
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Byte-by-byte Description of file: table3
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Bytes Format Units Label Explanations
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1- 8 A8 --- CJ1 B1950 source name according to IAU convention
10- 14 F5.3 Jy S Flux density of component
16- 21 F6.2 mas Rad *Radius of component
23- 28 F6.1 deg Theta *Angle to component
30- 34 F5.2 mas a FWHM of major axis of component
36- 39 F4.2 --- b/a Axial ratio of major to minor axis, b/a
41- 46 F6.1 deg Phi Position angle of major axis,
north through east
48- 52 F5.3 --- Amp []? Amplitude agreement factor
54- 58 F5.3 --- CP []? Closure Phase agreement factor
60- 64 F5.3 --- Tot []? Total agreement factor
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Note on Rad:
Radius of component, measured from position of the first component
Note on Theta:
Angle to component measured north through east from the position
of the first component
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- CJ1 Source name
12- 14 A3 --- Sample Sample, CJ1 or PR
16- 22 F7.1 mas a Beam FWHM major axis
24- 29 F6.1 mas b Beam FWHM minor axis
31- 35 I5 deg Theta Beam major axis position angle
37- 42 I6 mJy S5GHz Peak intensity
44- 49 F6.2 mJy e_S5GHz rms noise
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Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Source Source name
12- 14 A3 --- Sample Sample, CJ1 or PR
16- 23 F8.1 mJy S5GHz Peak intensity
25- 32 F8.2 mJy e_S5GHz rms noise
40- 43 A4 --- Struct *Structure
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Note on Struct:
Structure: U - unresolved
E - extended structure detected
E? - hint of extended structure
Note flag: a Faint component ~ 12" to the north
b Faint component ~ 1' to the west
c Logarithmic contour levels in steps of 2^{1/2}
d Convolved with 3" circular Gaussian beam
e Convolved with 5" circular Gaussian beam
f The lowest contour in 2 sigma
g The lowest contour is 4 sigma
h Source resolved at long baselines
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Note: All the figures are available on the AAS CD-ROM, directories:
/volume5/apjs/v99/p297/figure2
/volume5/apjs/v99/p297/figure4
/volume5/apjs/v99/p297/figure6
Origin: AAS CD-ROM series, Volume 5, 1995 Lee Brotzman [ADS] 29-Aug-95
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(End) [CDS] 02-Feb-1996