VIII/1A The 3C and 3CR Catalogues (Edge+ 1959-1962)
A Survey of Radio Sources at a Frequency of 159Mc/s
Edge D.O., Shakeshaft J.R., McAdam W.B., Baldwin J.E., Archer S.
<Mem. Roy. Astron. Soc. 68, 37 (1959)>
=1959MmRAS..68...37E 1959MmRAS..68...37E
The Revised 3C Catalogue of Radio Sources
Bennett A.S.
<Mem. Roy. Astron. Soc. 68, 163 (1962)>
=1962MmRAS..68..163B 1962MmRAS..68..163B
ADC_Keywords: Radio sources ; Surveys
Description:
The 3C Catalog is the result of observations with the Cambridge
four-element interferometer at a frequency of 159MHz, and contains
471 sources between declinations -22 and +71degrees, with a flux
density larger than 8Jy.
The Revised version of the 3C (3CR) is based on new observations at a
frequency of 178MHz, and represents a survey of all sources North of
-05degrees with a flux density brighter than 9Jy, except in the areas
near the ridge of galactic emission. The original numbering system has
been preserved.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
3c.dat 128 471 3C catalog of radio sources (1959)
3cr.dat 208 328 The revised 3C catalogue of radio sources (1962)
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See also:
J/PASP/97/932 : 3CR Source Identifications (Spinrad 1985)
Byte-by-byte Description of file: 3c.dat
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Bytes Format Units Label Explanations
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1- 3 I3 --- 3C [1,471] 3C source designation
4 A1 --- u_3C [)] sources with open doubt (1)
5 A1 --- f_3C [+] observed in both 3C(a) and 3C(c) surveys
6 A1 --- q_3C [*] sources with considerable confidence
7 A1 --- n_3C [AB] Analysis flag (2)
10- 12 A3 --- f_RAs [-<> ] Possible lobe confusion on R.A. (3)
13- 14 I2 h RAh Right ascension (1950.0)
16- 17 I2 min RAm Right ascension (1950.0)
19- 22 F4.1 s RAs Right ascension (1950.0)
23- 24 I2 s e_RAs ? rms uncertainty on right ascension
26- 27 A2 --- f_DEm [v^ ] Possible lobe confusion on Decl. (3)
28 A1 --- DE- Declination sign (1950.0)
29- 30 I2 deg DEd Declination (1950.0)
32- 35 F4.1 arcmin DEm Declination (1950.0)
36- 37 I2 arcmin e_DEm ? rms uncertainty on declination
38 A1 --- u_DEm [)] Uncertainty flag on DE rms
40- 46 F7.1 Jy S159MHz Flux density at 159MHz
47 A1 --- n_S159MHz [W] indicates a flux density taken from
Whitfield (1957MNRAS.117..680W 1957MNRAS.117..680W)
48- 52 F5.1 Jy e_S159MHz ? rms uncertainty on S159MHz
53 A1 --- u_S159MHz [)] Uncertainty flag on flux rms
54 A1 --- l_Diam [~<>] Limit flag on Diam
55- 58 F4.1 arcmin Diam ? Angular diameter
60- 62 F3.1 arcmin e_Diam ? rms uncertainty on Diam
64- 67 A4 --- n_Diam Note (C: Complex, >12' upper limit for Diam)
68- 70 I3 deg GLON Galactic longitude
73- 75 I3 deg GLAT Galactic latitude
77-128 A52 --- Notes Suggested correspondences and notes (4)
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Note (1): the numbers with parenthesis are doubtful
either because the data are incomplete (due mainly to interferences)
or because of exceptionally large spreads in the individual position
or amplitude estimates.
Note (2): analysis flag:
'A' indicates that the records could be analysed without recourse to a
vector analysis of confused traces.
'B' shows that some analysis of confused traces was made.
Note (3): Where there is some ambiguity in deciding on the correct
interference lobe the alternative positions are marked thus:
RA: -> Possibly lobe-shifted earlier
← Possibly lobe-shifted later
←> Possibly lobe-shifted earlier or later
DE: ^ Possibly lobe-shifted North
v Possibly lobe-shifted South
v^ Possibly lobe-shifted North or South
Note (4):
The symbols ->, ←, ^, v are used to indicate that a 2C source
(Shakeshaft et al., 1955MmRAS..67..106S 1955MmRAS..67..106S) has had to be lobe-shifted
earlier (->), later (←), North (^) or South (v).
Sources denoted DWD will be discussed by Dewhirst in a separate paper.
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Byte-by-byte Description of file: 3cr.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- 3CR 3CR source designation (1)
8- 9 I2 h RAh Right ascension (1950.0)
11- 12 I2 min RAm Right ascension (1950.0)
14- 17 F4.1 s RAs Right ascension (1950.0)
20- 23 F4.1 s e_RAs rms uncertainty on right ascension
25 A1 --- DE- Declination sign (1950.0)
26- 27 I2 deg DEd Declination (1950.0)
29- 32 F4.1 arcmin DEm Declination (1950.0)
34- 39 F6.2 arcmin e_DEm rms uncertainty on declination
41- 43 I3 deg GLON Galactic longitude
46- 48 I3 deg GLAT Galactic latitude
50- 56 F7.1 Jy S178MHz Flux density at 178MHz
57 A1 --- n_S178MHz [*] 469λ interferometer (2)
61 A1 --- l_Diam Limit flag on Diam
62- 65 F4.1 --- Diam ? Angular diameter
66 A1 --- x_Diam ["'] Units of diameter (' or ")
67- 70 F4.1 --- e_Diam ? rms uncertainty on Diam
71 A1 --- f_Diam [)] Confusing sources
73-208 A136 --- Notes Notes
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Note (1): The numbering of the sources follows as far as possible that of
the 3C catalogue. Some sources are omitted on account of errors in the
original list, others because areas south of -5° have not been
covered in the new survey; a number of additional sources in areas not
covered in the original survey have been added. The 3CR numbers keep
the ordering by increasing R.A.
Note (2): All flux densities observed with the 469λ interferometer
are marked by an asterisk; for all other sources the total power
measurement was used, subtracting the systematic correction of 1.5Jy,
according to the discussion by Bennett (1962MNRAS.125...75B 1962MNRAS.125...75B)
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History:
Prepared via OCR at CDS.
(End) James Marcout, Patricia Bauer [CDS] 16-Dec-2002