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J/AZh/77/407 Flat-spectrum radio sources at 0.97-21.7GHz (Gorshkov+, 2000)
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Analysis of instantaneous spectra of a complete sample of
flat-spectrum radio sources.
Gorshkov A.G., Konnikova V.K., Mingaliev M.G.
<Astron. Zh. 77, 407 (2000)>
=2000AZh....77..407G
=2000ARep...44..353G
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ADC_Keywords: Radio sources
Abstract:
The results of observations of a complete sample of flat-spectrum
radio sources with spectral indices {alpha}>-0.5 are presented. The
sample was selected from the Zelenchuk Survey at 3.9GHz (See Cat.
<VIII/49>) and contains all sources with declinations 4-6 degrees,
galactic latitudes |b|>10 degrees, and 3.9-GHz fluxes >200mJy. Spectra
at 0.97-21.7 GHz were obtained for all 69 sample sources. The spectra
were classified and a correlation between variability amplitude and
spectrum shape was found.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 72 69 Flux densities of the radio sources
table3.dat 67 41 Spectral parameters of sources with
separated components
table5.dat 45 28 Parameters of the sources whose spectra
could not be separated into components
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See also:
VIII/49 : The Zelenchuk Surveys (Amirkhanyan+, 1989)
J/AZh/72/291 : Variability at Frequencies 3.9 and 7.5 GHz (Gorshkov+, 1995)
Byte-by-byte Description of files: table1.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- [GKM2000] Source name
11-14 I4 mJy Flux0.97 ? Flux density at 0.97GHz
17-18 I2 mJy e_Flux0.97 ? Mean error on Flux0.97
21-24 I4 mJy Flux2.3 Flux density at 2.3GHz
27-28 I2 mJy e_Flux2.3 Mean error on Flux2.3
31-34 I4 mJy Flux3.9 Flux density at 3.9GHz
37-38 I2 mJy e_Flux3.9 Mean error on Flux3.9
41-44 I4 mJy Flux7.7 Flux density at 7.7GHz
47-48 I2 mJy e_Flux7.7 Mean error on Flux7.7
51-54 I4 mJy Flux11.1 Flux density at 11.1GHz
57-58 I2 mJy e_Flux11.1 Mean error on Flux11.1
61-64 I4 mJy Flux21.7 Flux density at 21.7GHz
67-69 I3 mJy e_Flux21.7 Mean error on Flux21.7
72 I1 --- Epoch [0-5] Epoch of the observations (1)
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Note (1): Epoch of the observations:
1 = August 1996
2 = May 1997
3 = August 1997
4 = November 1997
5 = January-February 1998
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Byte-by-byte Description of files: table3.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- [GKM2000] Source name
11-12 I2 h RAh Right ascension (1950)
14-15 I2 min RAm Right ascension (1950)
17-21 F5.2 s RAs Right ascension (1950)
24 A1 --- DE- Declination sign
25-26 I2 deg DEd Declination (1950)
28-29 I2 arcmin DEm Declination (1950)
31-35 F5.2 arcsec DEs Declination (1950)
38 A1 --- Class [GLQ] Object Class (1)
41-46 F6.4 --- z ? Redshift
48-51 I4 mJy Flux Flux density at the maximum of the spectrum
54-59 F6.3 GHz numax Frequency for the maximum of the spectrum
62-67 F6.3 --- Sp+Index Spectral curvature (=d(logS)/d(log{nu}))
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Note (1): Type is:
Q: quasar
L: BL Lac object
G: galaxy
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Table 4: Data on peak frequencies
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Radio sources N mean {sigma} Observer's frame Source frame
z z -------------------- ----------------------
{nu}(max),GHz {sigma} {nu}(max),GHz {sigma}
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all z 18 1.62 0.89 8.5 5.8 20.0 11.0
z>1.4 9 2.33 0.65 5.8 2.0 19.0 6.3
z<1.4 9 0.91 0.34 11.2 7.0 21.0 14.0
L 3 (0.5) - 11.3 0.6 17.0 1.0
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Byte-by-byte Description of files: table5.dat
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Bytes Format Units Label Explanations
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1- 8 A8 --- [GKM2000] Source name
11-12 I2 h RAh Right ascension (1950)
14-15 I2 min RAm Right ascension (1950)
17-21 F5.2 s RAs Right ascension (1950)
24 A1 --- DE- Declination sign
25-26 I2 deg DEd Declination (1950)
28-29 I2 arcmin DEm Declination (1950)
31-35 F5.2 arcsec DEs Declination (1950)
38 A1 --- Class [GLQ] Object class (1)
41-45 F5.3 --- z ? Redshift
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Note (1): Type is:
Q: quasar
L: BL Lac object
G: galaxy
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(End) Veta Avedisova [INASAN] 18-Sep-2000