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VIII/35 Radio Sources observed with Culgoora Circular Array (Slee 1995)
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Radio Sources Observed with the Culgoora Circular Array (CCA) at 80 and 160 MHz
Slee O.B.
<Australian J. Phys., 48, 143-186 (1995)>
=1995AuJPh..48..143S
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ADC_Keywords: Radio sources
Description:
This is a final, updated and recalibrated list of sources that were
observed with the Culgoora Circular Array (CCA) in the interval
1970-1984. The list contains all the sources that were published in
the Culgoora-1,2,3 Lists plus additional sources resulting from a
survey of 353 Abell clusters of galaxies.
The observations were made at 80 MHz and 160 MHz with HPBW in RA of
3.70' and 1.85' respectively. The beamwidth in Dec is wider by
sec(30.3 + Dec). This list brings together all CCA measurements of
flux density, position, spectral index and angular size, with limiting
flux densities of 4 Jy at 80 MHz and 2 Jy at 160 MHz. References to
the original Culgoora publications are given for each source.
The sources were selected for CCA observations from the Parkes, 4C and
Ohio catalogues if an extrapolation of the then existing spectral data
indicated that the 80 MHz flux density would be > 5 Jy. In addition,
about 300 additional sources were added from lists of special classes
of objects such as those discovered at higher frequencies from surveys
of the galactic plane, lists of pulsars and supernova remnants, from a
list of nearby bright galaxies and finally from a CCA survey of 353
Abell clusters of galaxies. An area of 16'x16' was surveyed about the
centres of 3500 fields, resulting in a total survey area of about 0.1
sr at 80 MHz.
Nomenclature Note:
Sources from this catalogue are designated "Cul HHMM+DDd" in the
literature. Note that the original Cul 1,2,3 lists have only HHMM+DD
as a name, but the present names should be preferred.
Author's address:
O.B Slee,
Australia Telescope National Facility,
CSIRO, Sydney
<bslee@atnf.csiro.au>
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog 90 2213 The CCA survey
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Byte-by-byte Description of file: catalog
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Bytes Format Units Label Explanations
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1- 8 A8 --- Cul Source name (1)
9 A1 --- n_Cul [*#] Note on Source (1)
11- 12 I2 --- o_S(160) ? Number of observations at 160 MHz (2)
14- 15 I2 --- o_S(80) ? Number of observations at 80 MHz (2)
17- 18 I2 h RAh Right Ascension B1950 (hours) (3)
19- 20 I2 min RAm Right Ascension B1950 (minutes) (3)
21- 24 F4.1 s RAs Right Ascension B1950 (seconds) (3)
26 A1 --- DE- Declination B1950 (sign) (3)
27- 28 I2 deg DEd Declination B1950 (degrees) (3)
29- 30 I2 arcmin DEm Declination B1950 (minutes) (3)
31- 32 I2 arcsec DEs Declination B1950 (seconds) (3)
34- 38 F5.1 deg GLON Galactic longitude
40- 44 F5.1 deg GLAT Galactic latitude
45 A1 --- l_S(160) [<] Limit flag on S(160).
46- 51 F6.1 Jy S(160) ? Flux density at 160 MHz (4)
52 A1 --- l_S(80) [<] Limit flag on S(80).
53- 56 I4 --- S(80) ? Flux density at 80 MHz (4)
58- 62 F5.2 --- SpIndex ? Spectral index between 80 and 160 MHz (5)
64 A1 --- l_MajAxis Limit flag on MajAxis
65- 68 F4.1 arcmin MajAxis ? Major axis to 0.10 brightness at 160 MHz (6)
70 A1 --- l_MinAxis Limit flag on MinAxis
71- 74 F4.1 arcmin MinAxis ? Minor axis to 0.10 brightness at 160 MHz (6)
76- 78 I3 deg PA ? Position angle of major axis
(east from north) (6)
80- 90 A11 --- Refs [0-9, ] References (7)
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Note (1): the Cul designation contains the B1950 name of the source,
using IAU recommended standards. The first four characters are the
hours and minutes of right ascension, and the last four the signed
declination in tenths of a degree (truncated). The source names in the
original Culgoora-1,2,3 Lists contained the signed declination in
degrees (truncated). IAU names given to tenths of declination in
previous papers (e.g. ref #4 in section 9 below) may differ by one or
two in the last digit.
The Cul designation is followed by symbols:
* An asterisk (*) following the source name denotes that this is
the centroid of two or more components, which can be located in the
maps and tables of references 3,4 and 5 below. The components are
not always parts of the same source.
# the flag '#' indicates that the Culgoora position was lost, but
the source can confidently be identified with a source whose
coordinates are given in the publication listed in the reference
column.
Note (2): These columns contain the numbers of independent observations
at 160 MHz and 80 MHz respectively. Each observation consists of
averaging 10-20 drift scans with the central 8 or 16 beams (spaced in
declination) of the CCA.
Note (3): The 160 MHz position is given if available, otherwise the
80 MHz position. The positional calibration was obtained by observing
at 2-hourly intervals strong unresolved sources with accurate
high-frequency positions. Position errors are tabulated for various
flux ranges and numbers of observations in the original Culgoora-1,2,3
Lists. The positions of sources with contour maps at 160 MHz (entries
in the angular size columns) are the centroids of the brightness
distributions. Positions of other sources were found by fitting a
one-dimensional Gaussian to the hour angle drift response and another
Gaussian across the declination channels.
Note (4): a recalibration of the flux scales was carried out by
Slee & Siegman (1988MNRAS.235.1313S). This resulted in our increasing
the flux density by an average of 10% at 80 MHz and 12% at 160 MHz.
The 160 MHz flux densities of sources with contour maps (entries in
the angular size columns) were obtained by integrating the brightness
contours.
Note (5): this column contains the power-law spectral index between
80 and 160 MHz (S(nu) {prop.to} nu^SpIndex^). A negative spectral
index implies that flux density is decreasing with frequency.
Note (6): These columns contain the major and minor axes of a
2-dimensional Gaussian ellipse that has been fitted to the 160 MHz
contour map together with the position angle of the major axis (from
north through east).The axes are given to the 0.10 brightness points
(1.82 x half-brightness diameter). Where only the major axis is
presented as a lower limit of 1.8 arcmin, the limit was derived (at
the 95% confidence level) from one-dimensional Gaussian fits to the
drift profiles in RA and Dec.
Note (7): References are
1 =1973AuJPS..27....1S Slee & Higgins 1973 (Culgoora-1 List)
2 =1975AuJPS..36....1S Slee & Higgins 1975 (Culgoora-2 List)
3 =1977AuJPS..43....1S Slee 1977 (Culgoora-3 List)
4 =1983PASAu...5..114S Slee & Siegman, Proc. ASA (Cluster Survey)
5 =1982PASAu...4..278S Slee, Siegman, & Mulhal (Culgoora-3 Analysis)
6 =1979PASAu...3..332S Slee & Quinn, Proc. ASA (Cluster Survey)
7 =1972ApL....12...75S Slee, Astrophys. Lett. (Bright Galaxies at 80 MHz)
8 =1972AuJPh..25..429D Dulk & Slee, Austral. (Supernova Remnants)
9 =1975PASAu...2....1S Slee & Sheridan, Proc.ASA (Cen-A & Pictor-A)
10 =1974Natur.248...33D Dulk & Slee (Sgr-A at 160 MHz)
11 =1991ApJS...75....1B Becker, White & Edwards (0736+016,2330+091,2349+135)
12 =1992ApJS...80..501O Owen, White & Burns (1005+007)
13 =1980BAAS...19.1048D Douglas (Texas Survey)
Additional data in these papers include 80 MHz positions, optical
identifications and beam broadening from the one-dimensional Gaussian
fitting. The Culgoora-1,2,3 papers also contain tables listing the
expected errors in flux density and position. References 3 and 4
contain the 160 MHz contour maps for many sources. Reference numbers
11,12,13 do not refer to Culgoora publications, but refer to papers
containing sources that can be confidently identified with five
sources, whose Culgoora positions have been lost.
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Historical Notes:
The basic table was formed by electronically scanning the Culgoora-3
list. Each line was later checked by visual comparison with the
unscanned list and scanning errors were corrected manually. Additional
sources were added manually from other references in <cul_ref>.
Angular size information was extracted from references 4 and 5 and
added manually to the final table. Positions of five sources for which
Culgoora positions had been lost were identified with the help of the
EINLINE service (telnet to einline.harvard.edu, login as 'einline'
with no password) and H. Andernach (file r132.new).
Note that the electronic version differs from the one published in
AuJPh.48.143 in that it includes several dozen more upper limits at
160 MHz, taken from the listed references.
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(End) Heinz J. Andernach [ESA-IUE] 19-Feb-1996