J/MNRAS/414/2528 LBA Calibrator Survey (LCS1) (Petrov+, 2011)
The LBA Calibrator Survey of southern compact extragalactic radio sources. LCS1.
Petrov L., Phillips C., Bertarini A., Murphy T., Sadler E.M.
<Mon. Not. R. Astron. Soc. 414, 2528 (2011)>
=2011MNRAS.414.2528P 2011MNRAS.414.2528P
ADC_Keywords: Positional data ; VLBI ; Fundamental catalog ; Radio sources
Keywords: instrumentation: interferometers - catalogues - surveys - astrometry
Abstract:
We present a catalogue of accurate positions and correlated flux
densities for 410 flat-spectrum, compact extragalactic radio sources
previously detected in the AT20G survey. The catalogue spans the
declination range [-90°, -40°] and was constructed from four
24-hour VLBI observing sessions with the Australian Long Baseline
Array at 8.3GHz. The VLBI detection rate in these experiments is 97%,
the median uncertainty of the source positions is 2.6mas, and the
median correlated flux density on projected baselines longer than
1000km is 0.14Jy. The goals of this work are 1) to provide a pool of
southern sources with positions accurate to a few milliarcsec, which
can be used for phase referencing observations, geodetic VLBI and
space navigation; 2) to extend the complete flux-limited sample of
compact extragalactic sources to the southern hemisphere; and 3) to
investigate the parsec-scale properties of high-frequency selected
sources from the AT20G survey. As a result of this VLBI campaign, the
number of compact radio sources south of declination -40 deg which
have measured VLBI correlated flux densities and positions known to
milliarcsec accuracy has increased by a factor of 3.5. The catalogue
and supporting material is available at http://astrogeo.org/lcs1.
Description:
The LCS1 catalogue of positions and correlated flux densities of 410
target sources observed with the Australian Long Baseline Array in the
absolute astrometry mode, at a frequency of 8.3GHz.
The catalogue contains the following information: source positions,
their inflated uncertainties and correlation coefficients between
right ascension and declination; the number of observations used; the
median correlated flux density and its uncertainties in three ranges
of baseline project lengths: 0-6Mλ, 6-25Mλ,
25-50Mλ.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table3.dat 57 11 The list of target sources that were not
detected in LCS1 VLBI observations
table5.dat 83 633 *Catalogue of source-correlated flux-density
estimates for both 410 target sources and 111
calibrator sources in each experiment
table6.dat 117 410 LCS1 catalogue
--------------------------------------------------------------------------------
Note on table5.dat: Some sources were observed on more than one experiment.
--------------------------------------------------------------------------------
See also:
J/AJ/142/35 : The VLBA Galactic Plane Survey. VGaPS. (Petrov+, 2011)
J/MNRAS/402/2403 : Australia Telescope 20GHz Survey Catalog, AT20G (Murphy+, 2
Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Jname IAU J2000 source name
12- 19 A8 --- Bname IVS B1950 source name
21- 22 I2 h RAh Right ascension (J2000.0)
24- 25 I2 min RAm Right ascension (J2000.0)
27- 31 F5.2 s RAs Right ascension (J2000.0)
33 A1 --- DE- Declination sign (J2000.0)
34- 35 I2 deg DEd Declination (J2000.0)
37- 38 I2 arcmin DEm Declination (J2000.0)
40- 43 F4.1 arcsec DEs Declination (J2000.0)
45- 49 F5.1 mJy S8.3 Flux density in mJy extrapolated to 8.3GHz
51- 55 F5.2 --- alpha ?=-9.99 Spectral index α
(in sense S(ν)∝να)
57 I1 --- Comm Comment flag (1)
--------------------------------------------------------------------------------
Note (1): Flag as follows:
1 = not in the AT20G catalogue
2 = flagged as an LMC source in the AT20G catalogue
3 = Galactic planetary nebula
4 = flagged as an extended source in the AT20G catalogue
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table5.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Jname IAU J2000 source name
12- 19 A8 --- Bname IVS B1950 source name
21- 30 A10 "YYYY/MM/DD" Date Observation date
32- 34 A3 --- St. [Cal ] "Cal" if it was used as an amplitude
calibrator
36- 37 I2 --- Nobs Number of used observations
39- 43 F5.3 Jy Flux1 Median correlated 8.3GHz flux density at
baseline project length range 0-6Mλ
45- 50 F6.3 Jy Flux2 ?=-1. Median correlated 8.3GHz flux density at
baseline project length range 0-19Mλ
52- 57 F6.3 Jy Flux3 Median correlated 8.3GHz flux density at
baseline project length range 19-44Mλ
59- 63 F5.3 Jy e_Flux1 rms uncertainty on Flux1
65- 70 F6.3 Jy e_Flux2 ?=-1. rms uncertainty on Flux2
72- 77 F6.3 Jy e_Flux3 ?=-1. rms uncertainty on Flux3
79- 83 A5 -- Exp Experiment name
--------------------------------------------------------------------------------
Byte-by-byte Description of file: table6.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 10 A10 --- Jname IAU J2000 source name
12- 19 A8 --- Bname IVS B1950 source name
21- 22 I2 h RAh Right ascension (J2000.0)
24- 25 I2 min RAm Right ascension (J2000.0)
27- 34 F8.5 s RAs Right ascension (J2000.0)
36 A1 --- DE- Declination sign (J2000.0)
37- 38 I2 deg DEd Declination (J2000.0)
40- 41 I2 arcmin DEm Declination (J2000.0)
43- 49 F7.4 arcsec DEs Declination (J2000.0)
51- 56 F6.2 mas e_RAs Inflated right ascension position uncertainty
(without cos(delta) factor)
58- 63 F6.2 mas e_DEs Inflated declination position uncertainty
65- 70 F6.3 --- Corr [-1,1] Correlation between estimates of right
ascension and declination
72- 75 I4 --- Nobs Number of used observations
77- 82 F6.3 Jy Flux1 Median correlated 8.3GHz flux density at
baseline project length range 0-6Mλ
84- 89 F6.3 Jy Flux2 Median correlated 8.3GHz flux density at
baseline project length range 0-19Mλ
91- 96 F6.3 Jy Flux3 Median correlated 8.3GHz flux density at
baseline project length range 19-44Mλ
98-103 F6.3 Jy e_Flux1 rms uncertainty on Flux1
105-110 F6.3 Jy e_Flux2 ?=-1. rms uncertainty on Flux2
112-117 F6.3 Jy e_Flux3 ?=-1. rms uncertainty on Flux3
--------------------------------------------------------------------------------
Acknowledgements:
Leonid Petrov, Leonid.Petrov(at)lpetrov.net
(End) Patricia Vannier [CDS] 28-Jun-2011