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1998A&AS..131..303Stanghellini+
J/A+AS/131/303 GHz-Peaked-Spectrum radio sources (Stanghellini+ 1998)
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A complete sample of GHz-Peaked-Spectrum radio sources and its radio properties
Stanghellini C., O'Dea C.P., Dallacasa D., Baum S.A., Fanti R., Fanti C.
=1998A&AS..131..303S (SIMBAD/NED BibCode)
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ADC_Keywords: Radio sources
Keywords: galaxies: active - quasars: general - radio continuum: galaxies
Abstract:
We define a complete sample of thirty-three GHz-Peaked-Spectrum (GPS)
radio sources based on their spectral properties. We present
measurements of the radio spectra and polarization of the complete
sample and a list of additional GPS sources which fail one or more
criteria to be included in the complete sample. The majority of the
data have been obtained from quasi-simultaneous multi-frequency
observations at the Very Large Array (VLA) during 3 observing
sessions. Low frequency data from the Westerbork Synthesis Radio
Telescope (WSRT) and from the literature have been combined with the
VLA data in order to better define the spectral shape. The objects
presented here show a rather wide range of spectral indices at high
and low frequencies, including a few cases where the spectral index
below the turnover is close to the theoretical value of 2.5 typical of
self-absorbed incoherent synchrotron emission. Faint and diffuse
extended emission is found in about 10% of the sources. In the
majority of the GPS sources, the fractional polarization is found to
be very low, consistent with the residual instrumental polarization of
0.3%.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table4.dat 30 378 Flux densities for the complete sample
table5.dat 30 162 Flux densities for the additional objects
tables.tex 90 984 LaTeX version of the tables
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See also:
VIII/42 : Texas Survey of radio sources at 365MHz (Douglas+ 1996)
VIII/16 : Molonglo Reference Catalogue of Radio Sources (Large+ 1991)
VIII/5 : Bright Extragalactic Radio Sources (1Jy) (Kuehr+, 1981)
VIII/37 : The Third Bologna Survey (B3) (Ficarra+ 1985)
VIII/18 : 6C Survey of radio sources I. (Baldwin+ 1985)
VIII/21 : 6C Survey of radio sources II. (Hales+ 1988)
VIII/22 : 6C Survey of Radio Sources III. (Hales+ 1990)
VIII/23 : 6C Survey of radio sources IV. (Hales+ 1991)
VIII/24 : 6C Survey of Radio Sources V. (Hales+ 1993)
VIII/25 : 6C Survey of radio sources VI. (Hales+ 1993)
Byte-by-byte Description of file: table4.dat table5.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- Name Source Name (1)
10- 15 F6.3 GHz nu Frequency
17- 21 F5.3 Jy Snu Flux density
23- 27 F5.3 Jy e_Snu rms uncertainty on S (2)
29- 30 I2 --- r_Snu References (3)
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Note (1): Individual notes:
0108+388: the flux density at 608 MHz and higher frequencies refers to
the core only, while the flux density measure at 325 MHz likely
includes the extended structure found close to the main compact
component (Baum et al. 1990).
0552+398: the flux density at 37 GHz is the average of the data taken in 1990
(Terasranta et al., 1992A&AS...94..121T), and the error is the
r.m.s of the distribution. The flux density at 90GHz is the average
of the data taken in 1990 (Steppe et al., 1992A&AS...96..441S), and
the error is the r.m.s of the distribution.
2134+004: The flux density at 87 GHz is the average of the data taken between
1985 and 1988 (Terasranta et al., 1992A&AS...94..121T), the error
is the r.m.s of the distribution.
Note (2): The errors are taken as 3% if they were found in literature to be
less then 3%.
Note (3): 1: VLA first session
2: VLA second session
3: VLA third session
4: WSRT
5: Northern Cross
6: Ratan 600
7: Douglas et al., 1996AJ....111.1945D, Cat.
8: Large et al., 1981MNRAS.194..693L, Cat.
9: Kuhr et al., 1981A&AS...45..367K, Cat.
10: Baum et al., 1990A&A...232...19B
11: de Bruyn, private communication
12: de Bruyn, 1990, in Proc. Dwingeloo Workshop, Compact Steep
Spectrum and GHz Peaked Spectrum Radio Sources, ed. C. Fanti,
R.Fanti, C.P. O'Dea, & R.T. Schilizzi, (Bologna: Istituto di
Radioastronomia), p.105
13: Steppe et al., 1988A&AS...75..317S
14: Chandler, 1995, VLA Test Memo 192
15: Ficarra et al., 1985A&AS...59..255F, Cat.
16: Esko, private communication
17: Gower et al., 1967MmRAS..71...49G,
Pilkington et al., 1965MmRAS..69..183P
18: Dennison et al., 1981AJ.....86.1604D
19: Edelson, 1987AJ.....94.1150E
20: Terasranta et al., 1992A&AS...94..121T
23: Fiedler et al., 1987ApJS...65..319F
24: Steppe et al., 1992A&AS...96..441S
25: Baldwin et al., 1985MNRAS.217..717B, Cat.
26: Hales et al., 1988MNRAS.234..919H, Cat.
27: Hales et al., 1990MNRAS.246..256H, Cat < VIII/22>
28: Hales et al., 1991MNRAS.251...46H, Cat.
29: Hales et al., 1993MNRAS.262.1057H, Cat.
30: Hales et al., 1993MNRAS.263...25H, Cat.
31: Khabrakhmanov, private communication.
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Acknowledgements: Carlo Stanghellini
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(End) Patricia Bauer [CDS] 19-Mar-1998