J/AJ/77/797 NRAO 5GHz Strong Source Survey (Pauliny-Toth+ 1972)
The NRAO 5-GHz radio source survey. III. The 140-ft "strong" source survey.
Pauliny-Toth I.I.K., Kellermann K.I.
<Astron. J. 77, 797 (1972)>
=1972AJ.....77..797P 1972AJ.....77..797P (SIMBAD/NED BibCode)
ADC_Keywords: Radio sources ; Surveys
Abstract:
The 140-ft telescope at the National Radio Astronomy Observatory has
been used to extend the 5-GHz strong source (S) survey over an area of
1.14 steradian. Some 240 sources have been detected in this region, of
which 135 are above the completeness limit of 0.6f.u. The distribution
of spectral indices for sources above the completeness limit is much
broader than for samples selected from long-wavelength surveys, owing
to an increase in the fraction of compact sources with flat spectra.
For about half of the sources selected at 6 cm, the spectral index
α>-0.5. Analysis of the dependence of the spectral index on the
flux density shows that, as expected from the 408-MHz number counts
and spectral index distribution, at 5 GHz there are fewer flat spectra
among the weak sources than among the stronger ones. The spectral
index distributions for the identified galaxies and quasars show the
familiar forms: the galaxies have a strong concentration near
α=-0.8 with a small tail extending toward flat spectra. The
quasars show a much broader distribution of indices, but the fraction
(80%) of quasars having flat spectra (α>-0.5) is much greater
than that found in the low-frequency surveys. The number-flux density
relation for various groups of sources selected from the 5-GHz survey
show that the anomalously steep slope is confined to (a) unidentified
sources, (b) sources with steep spectra (α←0.5), and (c)
sources located in the north galactic hemisphere. Sources identified
with radio galaxies or quasars, or which have flat spectra, or which
are in the south galactic hemisphere all show a number-flux density
slope near -1.5.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table2.dat 94 240 Green Bank 5-GHz strong source survey
notes.dat 80 26 Notes on table2.dat
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See also:
VIII/38 : The Parkes-MIT-NRAO 4.85GHz (PMN) Surveys (Griffith+ 1993-1996)
J/ApJS/90/173 : PMN map catalog of radiosources (Gregory+, 1994)
Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 7 A7 --- S3 Object designation
9- 10 I2 h RAh Right ascension (1950.0)
12- 13 I2 min RAm Right ascension (1950.0)
15- 18 F4.1 s RAs Right ascension (1950.0)
20 A1 --- DE- Declination sign
21- 22 I2 deg DEd Declination (1950.0)
24- 25 I2 arcmin DEm Declination (1950.0)
27- 28 I2 arcsec DEs Declination (1950.0)
30- 33 A4 --- n_RAh Origin of the position (1)
35- 38 F4.2 Jy S5GHz Flux density at 5GHz
40 A1 --- n_SI [>] > when lower limit
41- 45 F5.2 --- SI ? Spectral index below 5GHz (2)
47- 50 F4.2 --- e_SI ? rms uncertainty on SI
52- 54 A3 --- Ident Optical identification (4)
55 A1 --- n_Ident [:] : tentative identification (3)
57- 62 A6 --- Notes Individual notes detailed in file "notes.dat"
64- 94 A31 --- Cat Membership in other catalogs
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Note (1):
blank = position measured with the 140-ft telescope at 5 GHz.
OPT= optical position from literature.
NRI= position measured with the NRAO interferometer at 2.7 GHz
(Clark and Hogg, 1966ApJ...145...21C 1966ApJ...145...21C; Hogg, 1969ApJ...155.1099H 1969ApJ...155.1099H;
Wade, 1970ApJ...162..381W 1970ApJ...162..381W; Wade and Miley, 1971AJ.....76..101W 1971AJ.....76..101W).
RRE= position measured with the interferometer of the Royal Radar
establishment, Malvern at 2.7 GHz (Adgie, Crowther, and Gent,
1972MNRAS.159..233A 1972MNRAS.159..233A).
CAM= position measured with the Cambridge 1-mile synthesis instrument
at 1.4 GHz (Parker, Elsmore, and Shakeshaft, 1966Natur.210...22P 1966Natur.210...22P
MacDonald, Kenderdine, and Neville, 1968MNRAS.138..259M 1968MNRAS.138..259M; Mackay,
1969MNRAS.145...31M 1969MNRAS.145...31M; Elsmore and Mackay, 1969MNRAS.146..361E 1969MNRAS.146..361E).
PKT= Parkes transit measurements at 2.7 GHz (Shimmins, Clarke, and
Ekers, 1966AuJPh..19..649S 1966AuJPh..19..649S).
CT21= position measured with OVRO interferometer at 1.4 GHz
(Fomalont and Moffet, 1971AJ.....76....5F 1971AJ.....76....5F).
BOL= position from Bologna surveys at 408 MHz (Grueff and Vigotti,
1968ApL.....2..113G 1968ApL.....2..113G; Colla et al., 1970, Cat. VIII/36,
1972, Cat. VIII/36).
300= position measured with the 300-ft telescope at 1.4 GHz
(Pauliny-Toth, Wade, and Heeschen, 1966ApJS...13...65P 1966ApJS...13...65P).
Note (2): The spectral index is defined here as flux ∝ να
Note (3): An asterisk denotes a tentative identification, e.g., a suggested
QSS with no photometric or spectroscopic confirmation.
Identifications made on the basis of the present work are indicated
by a reference to a footnote in column Notes which also gives the
origin of the position used others are taken from the literature.
Identification are only given for sources above the completeness
limit
Note (4): QSS: quasars with spectroscopic or photometric confirmation
GAL: galaxy of undetermined type
E: elliptical galaxy
D: D galaxy
DB: dumbbell galaxy
SEY: Seyfert galaxy
N: N galaxy
EF: empty field (no object above plate limit or neutral star)
CF: confused field: several galaxies or stellar objects in field
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 2 I2 --- NoteID [1,16]+= Note number, repeated when
several lines are needed.
4- 80 A77 --- Text Text of note
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History: Prepared via OCR at CDS, and proof-read by Heinz Andernach
().
References:
Davies, Paper I. 1971AJ.....76..980D 1971AJ.....76..980D
Pauliny-Toth et al., Paper II. 1972AJ.....77..265P 1972AJ.....77..265P (S1,S2 surveys)
(End) James Marcout, Patricia Bauer [CDS] 20-Oct-1998