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J/MNRAS/182/273 The 5C6 and 5C7 surveys of radio sources. (Pearson, 1978)
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The 5C6 and 5C7 surveys of radio sources.
Pearson T.J.
<Mon. Not. R. Astron. Soc. 182, 273 (1978)>
=1978MNRAS.182..273P
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ADC_Keywords: Surveys ; Radio sources ; Radio continuum
Description:
This catalog contains the 5C6 and 5C7 radio surveys at 408 and 1407 MHz
done with the with the One-Mile telescope at Cambridge (UK).
The 5C6 survey of radio sources, made at 408 MHz (HPBW 80"x151") and
1407 MHz (HPBW 23"x44") was centered on 02:14 +32:00' (B1950) and
contains 297 sources stronger than 10 mJy at 408 MHz and 1.5 mJy at
1407 MHz. The flux densities are on the KPW scale (Kellermann et al.
1969ApJ...157....1K) and were based on 3C147 and 3C380. Positions,
positional errors, flux density information, and descriptions of
optical objects visible on the Palomar Sky Survey within about 20" of
the radio sources are given.
The 5C7 survey of radio sources, made at 408 MHz (HPBW 80"x176") and
1407 MHz (HPBW 23"x51") was centered at 08:17 +27:00 (B1950) and
contains 281 sources stronger than 10 mJy at 408 MHz and 1.5 mJy at
1407 MHz. The flux densities are on the KPW scale (Kellermann et al.
1969ApJ...157....1K), and were based on 3C147 and 3C380. Positions,
positional errors, flux density information, and descriptions of
optical objects visible on the Palomar Sky Survey within about 20" of
the radio sources are given.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
5c6.dat 137 297 5C6 Survey of Radio Sources
(RA: 2h - 2.4h; DEC: 29.5{deg} - 34.3{deg})
5c7.dat 138 281 5C7 Survey of Radio Sources
(RA: 8.1h - 8.4h; DEC: 24.3{deg} - 29.6{deg})
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See also:
J/MNRAS/171/475 : The 5C5 survey of radio sources
J/MNRAS/200/747 : 5C12 Survey of Radio Sources
Byte-by-byte Description of file: 5c6.dat
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Bytes Format Units Label Explanations
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2- 5 A4 --- 5C6 Name of source (1)
7- 8 I2 h RAh Right Ascension (B1950) (hour) (G1)
10- 11 I2 min RAm Right Ascension (B1950) (min)
13- 16 F4.1 s RAs Right Ascension (B1950) (sec)
17 A1 --- DE- Declination sign (B1950) (G1)
18- 19 I2 deg DEd Declination (B1950) (deg)
21- 22 I2 arcmin DEm Declination (B1950) (arcmin)
24- 25 I2 arcsec DEs Declination (B1950) (arcsec)
27 A1 --- Pos_Flag [ *] '*' if position is from 21 cm
observation (G1)
29- 31 F3.1 arcsec e_RAs ? Positional uncertainty in RA (G2)
32 A1 --- ext_flag [ e] Extension flag (G2)
33 A1 --- l_S408 [<(] Flagged if flux density is uncertain or
upper limit (2)
35- 41 F7.2 mJy S408 ? 408 MHz flux density (2)
43- 45 I3 mJy e_S408 ? Error on 408 flux density (2)
46 A1 --- f_e_S408 [ *] flux density error flag (2)
47- 50 F4.2 --- att_408 ? Envelope attenuation at 408 MHz (2)
52 A1 --- f_S1407 [ +] Flagged if 1407 flux density could not be
determined (G3)
54- 57 F4.1 mJy S1407 ? Flux density at 1407 MHz (G3)
59- 61 F3.1 mJy e_S1407 ? Error on 1407 flux density (G3)
62 A1 --- f_e_S1407 [ *] flux density error flag (G3)
63- 66 F4.2 --- att_1407 ? Envelope attenuation at 1407 MHz (G3)
68 A1 --- l_Sp-Index ? [<] Flagged if alpha is an upper limit (G4)
70- 73 F4.2 --- Sp-Index ? Spectral index between 408 and 1407 MHz (G4)
75-137 A63 --- comments Comments on the source (G5)
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Note (1): The serial number of the 5C6 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: 5C6.103
(0212+297).
Note (2): These columns give flux density information at 408 MHz. The
l_S408 column contains a '<' if the flux density is an upper
limit or an '(' if the flux density is estimated. 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 a 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).
An asterisk "*" in the f_e_S408 column indicates that the uncertainty
in flux density is very large because the source lies outside the
measured part of the envelope (attenuation factor less than 0.1).
These sources are included in the table only for their positions;
many of them have been observed in other surveys so it is
possible to check the positional accuracy.
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Byte-by-byte Description of file: 5c7.dat
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Bytes Format Units Label Explanations
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2- 5 A4 --- 5C7 Name of source (1)
7- 8 I2 h RAh Right Ascension (B1950) (hour) (G1)
10- 11 I2 min RAm Right Ascension (B1950) (min)
13- 16 F4.1 s RAs Right Ascension (B1950) (sec)
18 A1 --- DE- Declination sign (B1950) (G1)
19- 20 I2 deg DEd Declination (B1950) (deg)
22- 23 I2 arcmin DEm Declination (B1950) (arcmin)
25- 26 I2 arcsec DEs Declination (B1950) (arcsec)
28 A1 --- Pos_Flag [ *] '*' if position is from 21cm obs. (G2)
30- 32 F3.1 arcsec e_RAs ? Positional uncertainty in RA (G2)
33 A1 --- ext_flag [ e] extension flag 'e' if extended (G2)
34 A1 --- l_S408 [ <] '<' if flux density is an upper limit (2)
36- 39 I4 mJy S408 ? 408 MHz flux density (2)
41- 43 I3 mJy e_S408 ? Error on 408 flux density (2)
44 A1 --- f_e_S408 [ *] Flag on error estimation (2)
45- 48 F4.2 --- att_408 ? Envelope attenuation at 408 MHz (2)
50 A1 --- f_S1407 [ *+] Flagged if 1407 flux density could not be
determined (G3)
52- 56 F5.1 mJy S1407 ? Flux density at 1407 MHz (G3)
58- 61 F4.1 mJy e_S1407 ? Error on 1407 flux density (G3)
62 A1 --- f_e_S1407 [ *] Flag on error estimation (G3)
63- 66 F4.2 --- att_1407 ? Envelope attenuation at 1407 MHz (G3)
68 A1 --- f_Sp-Index [ <] Flagged if alpha is an upper limit (G4)
70- 74 F5.2 --- Sp-Index ? Spectral index between 408 and 1407 MHz (G4)
76-138 A63 --- comm Comments on the source (G5)
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Note (1): The serial number of the 5C7 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: 5C7.103
(0815+266).
Note (2): 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_S1407
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). An asterisk in
the f_e_S408 column indicates that the uncertainty in flux density
is very large because the source lies outside the measured part
of the envelope (attenuation factor less than 0.1). These sources
are included in the table only for their positions; many of them
have been observed in other surveys so it is possible to check
the positional accuracy.
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Global Notes:
Note (G1): These columns give the B1950.0 right ascension and declination of
the radio source, Positions measured at 1407 MHz are flagged with
an asterisk ('*') in the Pos_Flag column and are accurate to an
extra decimal place in right ascension and declination (2 decimal
places in RA and 1 in declination). For extended sources, the
position given is the peak of emission and the positional error
(ext_flag) is listed as 'e'.
Note (G2): This column gives the RA positional uncertainty, in arcsec,
excluding any systematic error. The uncertainties in declination
are greater by cosec dec (cosec({delta})). An 'e' in column
'ext_flag' means that the source is extended and the position given
is the peak of emission. Uncertainties vary depending on the
intensity and frequency of the observation.
Note (G3): These columns give flux density information at 1407 MHz. The
f_S1407 column is '+' if the position was measured at 1407 MHz
but the flux density could not be determined. 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. An
asterisk in the f_e_S1407 column indicates that the uncertainty in
flux density is very large because the source lies outside the
measured part of the envelope (attenuation factor less than
0.15). These sources are included in the table only for their
positions; many of them have been observed in other surveys so it
is possible to check the positional accuracy.
Note (G4): These columns give the spectral index flag and spectral index
between 408 and 1407 MHz. The alpha_flg column is marked with a
'<' if alpha is an upper limit. Alpha is defined in the sense
S {prop.to} {nu}^-{alpha}^.
Note (G5): This column gives comments on the source, including descriptions
of optical objects within 15-20 arcsec. The parameter 'r' is
given for sources detected at 1407 MHz on both high- and
low-resolution maps; r = * means that r could not be determined
accurately. The following abbreviations are used:
conf confused
sl slightly
pa position angle
N North
S South
f following
p preceeding
m magnitude
The references to other observations are as follows:
3C Third Cambridge Catalogue (3C 200 only) (Cat.<VIII/1>)
4C Fourth Cambridge Catalogue (Pilkington and Scott 1965) (Cat.<VIII/4>)
AO Arecibo Occultation Survey (Hazard, Gulkis, and Sutton
1968ApJ...154..413H)
B2 Bologna Survey (Colla et al. 1970A&AS....1..281C,
1972A&AS....7....1C, 1973A&AS...11..291C) Cat.<VIII/36>
GC NRAO 5-GHz Survey (Davis 1971AJ.....76..980D)
MW One-Mile Telescope fan-beam Survey (Willson 1972MNRAS.156....7W)
PKS Parkes Survey (Shimmins and Day 1968AuJPh..21..377S)
W Westerbork 1415 MHz Survey (Willis, Oosterbaan and de Ruiter
1976A&AS...25..453W)
5-km Observations with the Cambridge 5-km telescope (HPBW 2") (Ryle 1972)
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History:
"The catalogue was originally archived as A020 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.
Ryle, M. 1972, Nature, 239, 435.
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(End) Patricio Ortiz [CDS] 06-Apr-1999