ADC/CDS Standard Document for Catalog:/catalogs/8/8019/
ADC/CDS Standard Document for Catalog:| 1. Use the ADC Data Viewer Suite to visualize the data. |
|
| 2. Get the data files via anonymous FTP. (See Note.) |
|
VIII/19 Catalogues from a deep 327 MHz Westerbork Survey (Wieringa 1991,1993)
================================================================================
Catalogues from a deep 327 MHz Westerbork Survey
Wieringa M.H.
<Bull. Inf. CDS 43, 17 (1993) and Thesis, Leiden Univ. (1991)>
=1993BICDS..43...17W
================================================================================
ADC_Keywords: Radio sources; Surveys
Description:
We present the results of a deep survey of six fields with the
Westerbork Synthesis Radio Telescope at 327 MHz. In total we have
detected ~4500 sources brighter than our 5-sigma noise level, which
ranges from 2.4-3.5 mJy/beam, over an area of ~95 square degrees. For
four fields we also obtained 608 MHz observations, for the remaining two
fields 608 MHz observations were already available. We present the
source catalogues at both frequencies and derive source counts and
spectral indices.
The data were calibrated using the DWARF redundancy package and absolute
calibration is based on 3C286, using a flux of 26.93 Jy at 327 Mhz and
21.47 Jy at 608 MHz. The source parameters were determined using a
gaussian fitting procedure for all but the most complex sources and
statistical corrections for noise bias were applied.
As part of my PhD-thesis at Leiden Observatory I made the following
surveys at 327 and 608 MHz using the Westerbork Synthesis Radio Telescope:
--------------------------------------------------------------------------
64W2: Lynx, 327 MHz only (this field has been mapped at this frequency
before by M.J.A. Oort (thesis), I've added a 2 after the W to
indicate the revised list), numbers do not correspond because the
present survey is more sensitive.
69W : Draco, a survey of 2 overlapping fields at 327 MHz and 6 fields at
608 MHz.
70W : Umi, 327 MHz only, one field.
75W : OH471, one 327 MHz field and three 608 MHz fields
76W : Cam, one 327 MHz field and three 608 MHz fields
--------------------------------------------------------------------------
Sources detected at both frequencies have corresponding numbers in the
327 MHz (92cm) and 608 MHz (50cm) lists. Multiple sources are indicated
by a '*' after the name, their components by 'A','B', etc.
Components of multiple sources do not necessarily correspond between the
two frequencies, also in some cases one or more components may not be
detected at the other frequency.
The .tex files are in plain TeX format
The .dat files were written with the following format (fortran):
FORMAT(A8,1X,F9.2,1X,F4.2,1X,F9.1,1X,F4.1,1X,F8.2,1X,F7.2,1X,A2,
1 1X,F5.1,1X,F4.1,1X,F4.0,1X,F3.0,1X,F5.1,1X,F5.2,1X,F7.2,
1 1X,F5.2,1X,F5.2)
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
64w92cm.dat 110 706 Survey 64W2, 327 MHz (in Lynx)
69w50cm.dat 110 794 Survey 69W, 608MHz (in Draco)
69w92cm.dat 110 1199 Survey 69W, 327MHz (in Draco)
70w92cm.dat 110 595 Survey 70W, 327MHz (in UMi)
75w50cm.dat 110 414 Survey 75W, 608MHz (OH 471)
75w92cm.dat 110 806 Survey 75W, 327MHz (OH 471)
76w50cm.dat 110 485 Survey 76W, 608MHz (in Cam)
76w92cm.dat 110 851 Survey 76W, 327MHz (in Cam)
64w92cm.tex 80 1741 Survey 64W2, 327MHz, plain TeX version
69w50cm.tex 80 1934 Survey 69W, 608MHz, plain TeX version
69w92cm.tex 80 2901 Survey 69W, 327MHz, plain TeX version
70w92cm.tex 80 1458 Survey 70W, 327MHz, plain TeX version
75w50cm.tex 80 1041 Survey 75W, 608MHz, plain TeX version
75w92cm.tex 80 1980 Survey 75W, 327MHz, plain TeX version
76w50cm.tex 80 1197 Survey 76W, 608MHz, plain TeX version
76w92cm.tex 80 2079 Survey 76W, 327MHz, plain TeX version
--------------------------------------------------------------------------------
Byte-by-byte Description of file: *.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 8 A8 --- NAME Westerbork survey name + source number (1)
10- 11 I2 h RAh Right Ascension B1950 (hours)
12- 13 I2 min RAm Right Ascension B1950 (minutes)
14- 18 F5.2 s RAs Right Ascension B1950 (seconds)
20- 23 F4.2 s e_RAs Mean error on RA
25 A1 --- DE- Declination B1950 (sign)
26- 27 I2 deg DEd Declination B1950 (degrees)
28- 29 I2 arcmin DEm Declination B1950 (minutes)
30- 33 F4.1 arcsec DEs [0/60] Declination B1950 (seconds)
35- 38 F4.1 arcsec e_DEs Mean error on DE
40- 47 F8.2 mJy S Flux density at: 327 MHz for *92cm.dat files
608 MHz for *50cm.dat files
49- 55 F7.2 mJy e_S Mean error on S
57 A1 --- Res [URE] indicates whether the source is
unresolved (2)
resolved (R, fitted gaussian parameters
follow),
extended (E, multiple components found and
given on subsequent lines)
58 A1 --- l_MajAxis '<' indicates that an estimated upper limit
to the size follows (for Unresolved sources)
60- 64 F5.1 arcsec MajAxis The major axis (FWHM) of the fitted gaussian
(for resolved sources) or maximum component
separation (for extended sources) (2)
66- 69 F4.1 arcsec e_MajAxis *]0/30]?=-1.0 Mean error on MajAxis
71- 74 F4.0 deg PA [0/180] Position angle (North through East)(2)
76- 78 F3.0 deg e_PA Mean error in PA (2)
80- 84 F5.1 arcsec MinAxis The minor axis (FWHM, arcsec) of the fitted
gaussian (2)
86- 90 F5.2 --- R Ratio of total flux to fitted peak flux
91- 98 F8.2 --- SN Peak signal to noise ratio of source in map
100-104 F5.2 --- Atten Primary beam attenuation (>1)
106-110 F5.2 --- W Statistical weight for use in source counts
--------------------------------------------------------------------------------
Note on e_MajAxis: -1.0 indicates an undefined mean error
Note (1): The NAME has the form nnWmmmmM, where
nn is Westerbork survey number,
mmmm the source sequence number and
M is blank for single sources,
'*' for multiples,
'A', 'B', 'C',... for components
Note (2): The 'Res' flag takes the values
'U' when the source is unresolved; in this case, the values of
MajAxis, PA and MinAxis (as well as their mean errors)
should be ignored (see the *.tex files)
'R' when the source is resolved; in this case, the fitted gaussian
parameters follow
'E' for extended source; multiple components are found and given
on subsequent lines.
Historical Notes:
*09-Jul-1993: First version of this Description file;
*20-Sep-1994: Second version, Notes have been added, verified against
the Standards
================================================================================
(End) [CDS] 20-Sep-1994