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J/MNRAS/200/747 5C12: survey near the North Galactic Pole (Benn+, 1982)
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A deep radio/optical survey near the North Galactic Pole. I. The 5C12 catalogue.
Benn C.R., Grueff G., Vigotti M., Wall J.V.
<Mon. Not. R. Astron. Soc. 200, 747 (1982)>
=1982MNRAS.200..747B
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ADC_Keywords: Surveys ; Radio sources ; Radio continuum ; Galactic pole, north
Description:
This catalog contains a deep survey (5C12) of a region close to the
North Galactic Pole carried out with the Cambridge One-Mile Telescope
at 408 MHz (HPBW 80"x139") and at 1407 MHz (HPBW 23"x40"). The flux
densities are on the KPW scale (Kellermann et al. 1969ApJ...157....1K),
and were based on 3C48, 3C147 and 3C295. This part of the survey
contains 321 sources with apparent flux densities brighter than 9 mJy
at 408 MHz or 1.4 mJy at 1407 MHz.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
5c12.dat 116 321 5C12 Survey of Radio Sources (RA: 12.75h-13.2h;
DEC: 32.7{deg} - 38.3{deg})
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See also:
J/MNRAS/171/475 : The 5C5 survey of radio sources
J/MNRAS/182/273 : 5C6 and 5C7 Survey of Radio Sources
Byte-by-byte Description of file: 5c12.dat
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Bytes Format Units Label Explanations
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1- 4 A4 --- 5C12 Name of source (1)
5- 6 I2 h RAh Right Ascension (B1950) (hour) (2)
7- 8 I2 min RAm Right Ascension (B1950) (min)
9- 13 F5.2 s RAs Right Ascension (B1950) (sec)
14 A1 --- DE- Declination sign (B1950) (2)
15- 16 I2 deg DEd Declination (B1950) (deg)
17- 18 I2 arcmin DEm Declination (B1950) (arcmin)
19- 22 F4.1 arcsec DEs Declination (B1950) (arcsec)
23- 26 F4.1 arcsec e_RAs RA positional uncertainty (3)
28- 31 F4.1 arcsec e_DEs Dec positional uncertainty (3)
32 A1 --- l_S408 [ <] '<' if flux density is an upper limit (4)
33- 36 I4 mJy S408 ? 408 MHz flux density (4)
38- 41 I4 mJy e_S408 ? Error on 408 flux densit (4)y
43- 45 F3.2 --- att_408 ? Envelope attenuation at 408 MHz (4)
47- 51 F5.1 mJy S1407 ? Flux density at 1407 MHz (5)
53- 56 F4.1 mJy e_S1407 ? Error on 1407 flux density (5)
58- 60 F3.2 --- att_1407 ? Envelope attenuation at 1407 MHz (5)
61 A1 --- l_Sp-Index [ <] Flagged if alpha is an upper limit (6)
62- 65 F4.1 --- Sp-Index ? Spectral index between 408 and 1407 MHz (6)
67- 76 A10 --- obslist List of observations (7)
78- 89 A12 --- struct Structural information on the source (8)
91-116 A26 --- notes Notes on the source (9)
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Note (1): The serial number of the 5C12 source is given in this column. The
sources in each survey are numbered in increasing order of right
ascension. Occasionally two sources are grouped together in the
lists, and given suffixes a, b; this is done either when there
are two peaks of emission at 1407 MHz but only one at 408 MHz, or
when there is an obvious association between the two sources. The
IAU nomenclature has not been adopted because this position-based
system would be ambiguous for some of the 5C sources which are
very close together. The authors recommend that when it is
necessary to refer to a source by its 5C name in a context in
which its position is not obvious, the 5C name should be
accompanied by the IAU name in parentheses, thus: 5C12.103
(1256+328).
Note (2): These columns give the B1950.0 right ascension and declination of
the radio source. Positions measured at 1407 MHz are accurate to an
extra decimal place in right ascension and declination (2 decimal
places in RA and 1 in declination).
Note (3): These columns give the positional uncertainty in right ascension
and declination, in arcsec. If there is evidence for resolution
of the source (see notes column below), the errors given here are
underestimates.
Note (4): These columns give flux density information at 408 MHz. The
l_S408 column contains a '<' if the flux density is an upper
limit. The flux density is given in the S408 column. The rms
uncertainty in the 408 MHz flux density is given in the e_S408
column, which includes contribution of 3 percent uncertainty in
the envelope correction. The att_408 column gives the envelope
attenuation factor at 408 MHz (multiply S by this factor to recover
S' and hence the signal-to-noise ratio).
Note (5): These columns give flux density information at 1407 MHz. The flux
density is given in the S1407 column. The rms uncertainty in the
1407 MHz flux density is given in the e_S1407 column, and the
att_1407 column gives the envelope attenuation factor at 1407
MHz.
Note (6): These columns give the spectral index flag and spectral index
between 408 and 1407 MHz. The l_alpha column is marked with a
'<' if alpha is an upper limit. Alpha is defined in the sense
S {prop.to} {nu}^-{alpha}^. For sources undetected at the higher
frequency in 5C12, 1415 MHz flux densities from Katgert et al.
(1973A&A....23..171K) have been used.
Note (7): This column gives a list of other detections. The following
abbreviations are used:
Survey MHz Limit Beam Reference
(mJy)
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WKB 38 14000 45' Williams, Kenderdine, and Baldwin (1966)
4C 178 200 15'x8' Pilkington and Scott (1965) (Cat.<VIII/4>)
A0 318 500 16' Veron and Veron (1979A&AS...36..331V)
WK 408 70 3'x10' Windram and Kenderdine (1969MNRAS.146..265W)
GV 408 200 3'x10' Grueff and Vigotti (1968ApL.....2..113G)
B2.1 408 200 3'x10' Colla et al. (1970A&AS....1..281C)
B2.3 408 250 3'x10' Colla et al. (1973A&AS...11..291C)
W6 610 12 53"x92" Katgert (1978A&AS...31..409K)
W 1415 7 23"x40" Katgert et al. (1973A&A....23..171K)
OH 1420 160 10'x40' Dixon and Kraus (1968AJ.....73..381D)
DA 1420 1000 36' Galt and Kennedy (1968AJ.....73..135G)
K2 2700 2 4"x6" 5-km telescope
K5 5000 2 2"x4" 5-km telescope
GC 5000 49 3' Davis (1971AJ.....76..980D)
Note (8): This column gives structural information on the source. The
following abbreviations are used:
dbl double
p possibly resolved
r information from ratio between 1407 MHz flux densities measured
from low- and high-resolution maps
u unresolved
v information from visibility measured as a function of baseline
Other codes in parentheses indicate the source of the information
according to the abbreviation in the obslist column above.
4 = 408 MHz (5C12); 14 = 1407 MHz (5C12).
Note (9): This column gives notes on the source. An asterisk indicates that
further information on the source is given in the notes appended
to the table in the original paper.
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History:
"The catalogue was originally archived as A021 by H. Andernach
(heinz@astro.ugto.mx) and the ADS documentation prepared in
collaboration with Carolyn Stern Grant (stern@cfa.harvard.edu)."
References:
Pilkington, J.D.H. and Scott, P.F. 1965, Mem.R.A.S., 69, 183.
Williams, P.J.S., Kenderdine, S., and Baldwin, J.E. 1966, Mem.R.A.S., 70, 53.
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(End) Patricio Ortiz [CDS] 06-Apr-1999