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1994ApJS...95..345Taylor+
1995ApJS...98....1Henstock
See also Caltech-Jodrell Bank VLBI Survey I
J/ApJS/95/345 Second Caltech-Jodrell Bank VLBI Survey. I. (Taylor+ 1994)
================================================================================
The Second Caltech-Jodrell Bank VLBI Survey. I. Observations of 91 of 193
Sources
Taylor G.B., Vermeulen R.C., Pearson T.J., Readhead A.C.S.,
Henstock D.R., Browne I.W.A., Wilkinson P.N.
=1994ApJS...95..345T (SIMBAD/NED BibCode)
================================================================================
ADC_Keywords: VLBI ; QSOs ; Radio sources
Keywords: galaxies: structure - quasars: general - radio continuum: galaxies -
surveys - techniques: interferometric
Abstract:
We define the sample for the second Caltech-Jodrell Bank VLBI survey.
This is a sample of 193 flat- or gigahertz-peaked-spectrum sources
selected at 4850 MHz. This paper presents images of 91 sources with a
resolution of ~1 mas, obtained using VLBI observations at 4992 MHz
with a global array. The remaining images and the integrated radio
spectra will be presented in a forthcoming paper by Henstock et al.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 84 193 The CJ2 sample
table2 64 19 Telescope characteristics
table3.dat 66 91 *Map parameters
table4 64 208 Gaussian models
fig/* . 119 Directory of FITS images corresponding to
the maps in Figure 2 of the printed paper
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Note to table3.dat: table3 list the FWHM contours of the Gaussian beam of the
figures.
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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/99/297 : First Caltech-Jodrell Bank VLBI Survey. III (Xu+ 1995)
J/ApJS/100/1 : Second Caltech-Jodrell Bank VLBI Survey. II. (Henstock+ 1995)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Source B1950 source name according to IAU convention
9-11 I3 h RAh *Right ascension, J2000
12-14 I3 min RAm Right ascension, J2000
15-23 F9.5 s RAs Right ascension, J2000
24 A1 --- DE- Declination sign, always blank
25-26 I2 deg DEd Declination, J2000
27-29 I3 arcmin DEm Declination, J2000
30-37 F8.4 arcsec DEs Declination, J2000
38-43 F6.3 --- S80cm *[]? Total flux density at 80 cm
44-49 F6.3 --- S20cm *[]? Total flux density at 20 cm
50-55 F6.3 --- S6cm *Total flux density at 6 cm
56-61 F6.3 --- S3.6cm *Total flux density at 3.6 cm
63-64 A2 --- IDopt *Optical identification
65-69 F5.1 mag Rmag *[]? Apparent R magnitude
70 A1 --- n_z [f] Indicates a featureless spectrum
71-75 F5.3 --- z *[]? Redshift
77-84 A8 --- Date Date of VLBI observations
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Note to RAh:
The position for one source 0256+424 was off in Patnaik et al.
(1992MNRAS.254..655P) and as reproduced in the text. In this table the
correct position is reported. Accuracy is ~12 mas, except for
0256+424 for which the accuracy is ~100 mas.
Note to S80cm:
Total flux density at 80cm from J. Douglas, private communication.
Note to S20cm:
Total flux density at 20cm from White & Becker (1992) Cat.
Note to S6cm:
Total flux density at 6cm from Gregory & Condon (1991) Cat.
Note to S3.6cm:
Total flux density at 3.6cm from Kuhr et al. (1981AJ.....86..854K)
or JVAS (Patnaik et al. 1992MNRAS.254..655P)
Note to IDopt:
Optical identification from automated scanning of the POSS plates
or by eye.
Key to identifications:
Q - Quasar
G - Galaxy
BL - BL Lac object
EF - Empty Field
BS - Blue stellar object
BO - Blue object
RS - Red stellar object
RO - Red object
NS - Neutral stellar object
NO - Neutral object
Note to Rmag:
Apparent R magnitude of the object obtained by automated scanning of
the POSS E plates. The rms error is 0.3 down to magnitude 19.5 and
increases to 0.5 by magnitude 20.0.
Note to z:
Redshifts primarily from Veron-Cetty and Veron 1993, ESO Scientific
Report No. 13 Cat.
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Byte-by-byte Description of file: table2
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Bytes Format Units Label Explanations
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1- 12 A12 --- Tel Telescope name
14- 15 A2 --- Code Code used (1)
17- 37 A21 --- Loc Location of each telescope
39- 41 I3 m Diam Diameter of each telescope
42 A1 --- n_Diam [x] x when two values
43- 44 I2 m Diam2 ? Diameter when two values
46 A1 --- Jun1992 ["] Session Jun 1992 success (2)
48 A1 --- Sep1992 ["] Session Sep 1992 success (2)
50 A1 --- Mar1993 ["] Session Mar 1993 success (2)
52- 54 I3 K TsysK System temperature in K (3)
56- 58 I3 Jy TsysJy System temperature in Jy (3)
60- 64 F5.3 K/Jy Sens Sensitivity of the system
--------------------------------------------------------------------------------
Note (1): B = Max-Planck-Institut fur Radioastronomie
O = Onsaa Space Observatory
W = Westerbork Synthesis Radio Telescoper, NFRA
J2, C = Nuffield Radio Astronomy Laboratories
L, N = Instituto di Radioastronomia
G = National Radio Astronomy Observatory
K = Haystack Observatory
BR,FD,HN,KP,LA,NL,OV,PT,SC = National Radio Astronomy Observatory VLBA
Y = National Radio Astronomy Observatory VLA
Note (2): " indicates whether the telescope participated successfully
in that session.
Note (3): The values quoted are representative of the three sessions.
The VLA was used in single-antenna mode.
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Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Source B1950 source name according to IAU convention
10-17 A8 --- Date Date of VLBI observation
18-20 I3 min Dur Duration on source of VLBI observation
21-25 F5.2 mas a ? FWHM of major axis of the restoring beam
26-30 F5.2 mas b ? FWHM of minor axis of the restoring beam
31-34 I4 deg PA [-76/69]? Position angle of major axis,
north through east
35-39 I5 mJy S4.85GHzn *? Peak flux density, naturally weighted map
40-45 F6.2 mJy e_S4.85GHzn *? Off source rms, naturally weighted map
46-50 F5.2 % S4.85GHznC ? First contour, percent of peak flux density
51-55 I5 mJy S4.85GHzt *? Peak flux density, tapered map
56-61 F6.2 mJy e_S4.85GHzt *? Off source rms, tapered map
62-66 F5.2 % S4.85GHztC ? First contour, % of peak flux density
--------------------------------------------------------------------------------
Note on S4.85GHzn, e_S4.85GHzn, S4.85GHzt, e_S4.85GHzt: Data are in mJy/beam
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Byte-by-byte Description of file: table4
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Bytes Format Units Label Explanations
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1- 8 A8 --- CJ2 B1950 source name according to IAU convention
9-14 F6.3 Jy S Flux density of component
15-21 F7.2 mas Rad *Radius of component
22-28 F7.1 deg Theta *Angle to component
29-34 F6.2 mas a FWHM of major axis of component
35-39 F5.2 --- b/a Axial ratio of major to minor axis, b/a
40-46 F7.1 deg Phi Position angle of major axis,
North through East
47-52 F6.3 --- Amp []? Amplitude agreement factor
53-58 F6.3 --- Phase []? Closure phase agreement factor
59-64 F6.3 --- Total []? Total agreement factor
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Note to Rad:
Radius of component, measured from position of first component.
Note to Theta:
Angle to component, measured North through East from the position of
the first component.
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Historical Notes:
* 29-Apr-1997: table2 added at CDS (J. Marcout, CDS)
Origin: AAS CD-ROM series, Volume 4, 1995 Lee Brotzman [ADS] 07-May-95
================================================================================
(End) James Marcout, Patricia Bauer [CDS] 24-Oct-1996
J/ApJS/100/1 Second Caltech-Jodrell Bank VLBI Survey. II. (Henstock+ 1995)
================================================================================
The Second Caltech-Jodrell Bank VLBI Survey. II. Observations of 102 of 193
Sources
Henstock D.R., Browne I.W.A., Wilkinson P.N., Taylor G.B.,
Vermeulen R.C., Pearson T.J., Readhead A.C.S.
=1995ApJS..100....1H (SIMBAD/NED BibCode)
================================================================================
ADC_Keywords: VLBI ; QSOs ; Radio sources
Keywords: galaxies: structure - quasars: general - radio continuum: galaxies -
surveys - techniques: interferometric
Description:
This is the second of two papers presenting the Second Caltech-
Jodrell Bank VLBI survey (CJ2). The CJ2 sample consists of 193 flat-
and gigahertz-peaked-spectrum sources selected at 4850 MHz. In this
paper we present images of the remaining 102 sources with ~1 mas
resolution, obtained using VLBI snapshot observations at 4992 MHz with
a global array. We also present integrated radio spectra for the
entire CJ2 sample.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table2.dat 66 102 Map parameters
table3 64 254 Gaussian models
fig/* . 51 Maps in FITS format
--------------------------------------------------------------------------------
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)
Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- Source B1950 source name according to IAU convention
10- 17 A8 --- Date Date of VLBI observation
19- 20 I2 min Dur Duration on source of VLBI observation
22- 25 F4.2 mas a FWHM of major axis of the restoring beam
27- 30 F4.2 mas b FWHM of minor axis of the restoring beam
32- 34 I3 deg PA [-79/57] Position angle of major axis,
north through east
36- 39 I4 mJy S4.85GHzn *Peak flux density, naturally weighted map
41- 45 F5.2 mJy e_S4.85GHzn *Off source rms, naturally weighted map
47- 50 F4.2 % S4.85GHznC First contour, percent of peak flux density
52- 55 I4 mJy S4.85GHzt *? Peak flux density, tapered map
57- 61 F5.2 mJy e_S4.85GHzt *? Off source rms, tapered map
63- 66 F4.2 % S4.85GHztC ? First contour, % of peak flux density
--------------------------------------------------------------------------------
Note on S4.85GHzn, e_S4.85GHzn, S4.85GHzt, e_S4.85GHzt: Data are in mJy/beam
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table3
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- CJ2 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 --- Phase []? Closure phase agreement factor
60- 64 F5.3 --- Total []? Total agreement factor
--------------------------------------------------------------------------------
Note on Rad:
Radius of component, measured from position of first component.
Note on Theta:
Angle to component, measured north through east from the position of
the first component.
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Origin: AAS CD-ROM series, Volume 4, 1995 Lee Brotzman [ADS] 10-May-95
================================================================================
(End) Patricia Bauer [CDS] 14-Oct-1996