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VIII/60 Interferometer phase calibration sources (Patnaik+ 1998)
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Interferometer Phase Calibration Sources.
I. The region 35{deg}<={delta}<=75{deg}.
Patnaik A.R., Browne I.W.A., Wilkinson P.N., Wrobel J.M.
<Mon. Not. R. Astron. Soc. 254, 655 (1992) >
=1992MNRAS.254..655P
II. The region 0{deg}<={delta}<=+20{deg}.
Browne I.W.A., Patnaik A.R., Wilkinson P.N., Wrobel J.M.
<Mon. Not. R. Astron. Soc. 293, 257 (1998)>
=1998MNRAS.293..257B
III. The regions +20{deg}<={delta}<=+35{deg} and +75{deg}<={delta}<=+90{deg}
Wilkinson P.N., Browne I.W.A., Patnaik A.R., Wrobel J.M., Sorathia B.
<Mon. Not. R. Astron. Soc. 300, 790 (1998)>
=1998MNRAS.300..790W
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ADC_Keywords: Radio sources ; Interferometry
Keywords: instrumentation: interferometers - techniques: interferometric -
catalogues - surveys - astrometry - radio continuum: general
Description:
The catalogue contains compact radio sources with accurate positions
observed with the Very Large Array (VLA). These sources are primarily
intended for use as phase calibration sources for the Multi-Element
Radio Linked Interferometer Network (MERLIN); the sources are also
suitable as phase calibrators for the VLA and can be considered as
candidate phase calibrators for very long-baseline interferometry
(VLBI) networks.
The accuracy of the position is 12 mas for sources in Paper I,
14 mas for sources in Paper II, and 55 mas for sources in Paper III.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
calib.dat 108 2121 Jodrell Bank VLA Astrometric Survey (JVAS) list
of phase calibrators
notcalib.dat 99 126 JVAS list of sources found in the survey which
are not suitable as calibrators
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Byte-by-byte Description of file: calib.dat notcalib.dat
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Bytes Format Units Label Explanations
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1 I1 --- Paper [1/3] Paper number (1)
3- 11 A9 --- Bname Source name derived from B1950 coordinates
13- 22 A10 --- Jname Source name derived from J2000 coordinates
23 A1 --- n_Jname [*] Note on Jname (2)
25- 26 I2 h RAh Right ascension (J2000)
28- 29 I2 min RAm Right ascension (J2000)
31- 38 F8.5 s RAs Right ascension (J2000)
40 A1 --- DE- Declination sign
41- 42 I2 deg DEd Declination (J2000)
44- 45 I2 arcmin DEm Declination (J2000)
47- 53 F7.4 arcsec DEs Declination (J2000)
55- 62 F8.1 mJy S8.4GHz Total flux density at 8.4GHz
63- 69 F7.1 mJy S8.4GHzP ? Peak flux density at 8.4GHz (3)
71- 72 A2 --- Code [PSD *] Code (4)
73-109 A37 --- Com Comments on structure (5)
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Note (1): 1: Paper I, Patnaik et al., 1992MNRAS.254..655P, precision 12mas
2: Paper II, Browne et al., 1998MNRAS.293..257B, precision 14mas
3: Paper III, Wilkinson et al., 1998MNRAS.300..790W, precision 55mas
Note (2): Correction to paper II. There are two errors of nomenclature viz:
J2000 name for B0006+061 should be J0009+0628 not J0009+0638
J2000 name for B1901+155 should be J1904+1536 not J1904+1636
Note (3): Only for data of paper II and III
Note (4): Only for data of paper I
P: primary calibrator with >95% of their flux density contained in
an unresolved component
S: secondary calibrators up to 20% resolved on the longest
baselines but with point-dominated structure
D: double source
*: 15-Jul-1997: Thanks are due to H. Andernach for communicating the
errors he detected, and a corrected position (derived from Taylor
et al's 1996ApJS..107...37T VLA observations) for the source
B0256+424
Note (5): ext: extension;
sec: secondary component;
PA: position angle in degrees with separation in arcsec;
res: resolved;
sli: slightly;
VLBI: quoted position is from the VLBI catalogues of Ma et al. (1990,
Cat. <I/151>) and Russell et al. (1991AJ....101.2266R), with
additional source positions provided by Dr J.L. Russell;
image: map presented in this paper (see Figure A1 and Table A1 in
Appendix A1)
*: position derived from 1992 October observations hence rms
uncertainty 0.010" in each coordinate.
#: throw to calibrator >12d hence position error may exceed
0.100" (see text).
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Acknowledgements: Ian Browne <iwb@jb.man.ac.uk>
History: Paper I prepared via OCR at CDS.
* 15-Jul-1997: Thanks are due to H. Andernach for communicating the
errors he detected, and a corrected position (derived from Taylor et
al's 1996ApJS..107...37T VLA observations) for the source B0256+424
* 11-Nov-1997: further errors reported by Browne et al. to H. Andernach
to be published in "Interferometer phase calibration sources II" for
B1705+456 and B1817+502
* 04-Jan-2000: the 3 catalogues were merged in a unique table.
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(End) Francois Ochsenbein [CDS] 04-Jan-2000