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J/MNRAS/171/475 The 5C5 survey of radio sources. (Pearson, 1975)
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The 5C5 survey of radio sources.
Pearson T.J.
<Mon. Not. R. Astron. Soc. 171, 475 (1975)>
=1975MNRAS.171..475P
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ADC_Keywords: Surveys ; Radio sources ; Radio continuum
Description:
This catalog contains the 5C5 survey of radio sources, one of a series
of deep surveys made at 408 MHz (HPBW 80"x109") and 1407 MHz (HPBW
23"x31") with the One-Mile telescope at Cambridge. The 5C5 survey was
centered on 09h40m+47d (B1950) and contains 252 sources stronger than
8.7 mJy at 408 MHz and 1.8 mJy at 1407 MHz. The flux densities are on
the KPW scale (Kellermann et al. 1969ApJ...157....1K), and were based
on 3C48. This table was originally published in Pearson, T.J
(1975MNRAS.171..475P)
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
5c5.dat 129 252 5C5 Survey of Radio Sources
(RA: 9.5h-9.9h; DEC: 44.5{deg} -49.5{deg} )
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See also:
J/MNRAS/182/273 : 5C6 and 5C7 Survey of Radio Sources
J/MNRAS/200/747 : 5C12 Survey of Radio Sources
Byte-by-byte Description of file: 5c5.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Name of source (1)
9- 10 I2 h RAh Right Ascension (B1950) (hour) (2)
11- 12 I2 min RAm Right Ascension (B1950) (min)
13- 17 F5.2 s RAs Right Ascension (B1950) (sec)
18 A1 --- DE- Declination sign (B1950) (2)
19- 20 I2 deg DEd Declination (B1950) (deg)
21- 22 I2 arcmin DEm Declination (B1950) (arcmin)
23- 26 F4.1 arcsec DEs Declination (B1950) (arcsec)
28- 30 F3.1 arcsec pos_err ? Positional uncertainty in R.A. (2)
31 A1 --- ext_flag [ e] Flagged 'e' if extended (2)
33- 36 I4 mJy S408 ? 408 MHz flux density (3)
38- 40 I3 mJy e_S408 ? Error on 408 flux density (3)
41 A1 --- f_S408 [ *] '*' flux density is almost certainly
wrong (3)
43- 45 F3.2 --- att_408 ? Envelope attenuation at 408 MHz (3)
47- 51 F5.1 mJy S1407 ? Flux density at 1407 MHz (4)
53- 56 F4.1 mJy e_S1407 ? Error on 1407 flux density (4)
57 A1 --- f_S1407 [ *] '*' flux density is almost certainly
wrong (4)
59- 61 F3.2 --- att_1407 ? Envelope attenuation at 1407 MHz (4)
63- 67 F5.2 --- Sp-Index ? Spectral index between 408 and 1407 MHz (5)
69-129 A61 --- comments Comments on the source (6)
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Note (1): The serial number of the 5C5 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: 5C5.103
(0938+467).
Note (2): 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 ext_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, the positional error
(pos_err) is listed as blank and 'ext_flag' is marked 'e'.
Note (3): These columns give flux density information at 408 MHz. 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_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.
Note (4): 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. An asterisk in the f_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 (5): This column gives the spectral index between 408 and 1407 MHz.
Alpha is defined in the sense S {prop.to} {nu}^-{alpha}^.
Note (6): This column gives comments on the source. The following
abbreviations are used:
ARG Half-Mile telescope Survey at 1421 MHz (Gillespie,
1975MNRAS.170..541G)
KPD 5 GHz KPD survey (Kellermann et al. 1968)
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History:
"The catalogue was originally archived as A068 by H. Andernach
(heinz@astro.ugto.mx) and the ADS documentation prepared in
collaboration with Carolyn Stern Grant (stern@cfa.harvard.edu)."
References:
Kellermann, K.I, Pauliny-Toth, I.I.K. & Davies, M.M. 1968,
Astrophys. Lett., 2, 105.
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(End) Patricio Ortiz [CDS] 06-Apr-1999