J/AZh/83/241 Flux-density-complete sample of radio sources (Gorshkov+, 2006)
Instantaneous spectra for a flux-density-complete sample of radio sources in
the declination zone 74-75 deg.
Gorshkov A.G., Konnikova V.K., Mingaliev M.G.
<Astron. Zh. 83, 241 (2006)>
=2006AZh....83..241G 2006AZh....83..241G
=2006ARep...50..210G 2006ARep...50..210G
ADC_Keywords: Radio sources
Abstract:
We present the results of observations of flux-density- complete
sample of radio with the RATAN-600 radio telescope at 0.97, 2.3, 3.9,
7.7, 11.1, and 21.7GHz. The sample was extracted from the GB6 catalog
(VIII/40) at 4.85GHz, and contains all the sources at declination
zone 74-75° (J2000) with flux densities S(4.85)>100mJy. We have
obtained optical identifications for 67% of radio sources with flat
spectra and 36% of those with normal spectra.
Description:
We carried out two sets of observations of the sample, from August 16
to September 15, 1998 and from July 5 to August 5, 2003.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 98 44 *Optical identifications and flux densities for
flat-spectrum sources (27 sources)
table2.dat 98 32 Identifications and flux densities for the
steep-spectrum sources
--------------------------------------------------------------------------------
Note on table1.dat: For sources observed during both runs, the first line gives
data for 1998 and the second data for 2003.
--------------------------------------------------------------------------------
See also:
VIII/40 : GB6 catalog of radio sources (Gregory+ 1996)
Byte-by-byte Description of file: table1.dat table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 2 I2 h RAh Right Ascension (J2000) (hours)
4- 5 I2 min RAm Right Ascension (J2000) (minutes)
7- 12 F6.3 s RAs Right Ascension (J2000) (seconds)
15- 16 I2 deg DEd Declination (J2000) (degrees)
18- 19 I2 arcmin DEm Declination (J2000) (minutes)
21- 25 F5.2 arcsec DEs Declination (J2000) (seconds)
28- 29 A2 --- Ident Identifications (1)
32- 36 F5.3 --- z ? Redshift
38- 39 I2 --- Ref ? References for the redshift (2)
42- 46 F5.2 --- Bmag ? B magnitude
49- 52 I4 mJy S0.97 ? Flux density at 0.97 GHz
54- 56 I3 mJy e_S0.97 ? Uncertainty on S0.97
58- 61 I4 mJy S2.3 ? Flux density at 2.3 GHz
64- 65 I2 mJy e_S2.3 ? Uncertainty on S2.3
67- 70 I4 mJy S3.9 Flux density at 3.9 GHz
72- 73 I2 mJy e_S3.9 ? Uncertainty on S3.9
75- 78 I4 mJy S7.7 ? Flux density at 7.7 GHz
80- 81 I2 mJy e_S7.7 ? Uncertainty on S7.7
83- 86 I4 mJy S11.1 ? Flux density at 11.1 GHz
88- 89 I2 mJy e_S11.1 ? Uncertainty on S11.1
91- 94 I4 mJy S21.7 ? Flux density at 21.7 GHz
97- 98 I2 mJy e_S21.7 ? Uncertainty on S21.7
--------------------------------------------------------------------------------
Note (1): Identifications as follows:
Q = quasars
G = galaxies
EF = empty field
L = BL Lac objects
+ = means that the source was identified but has not yet been classified.
Note (2): References as follows:
16 = Veron-Cetty & Veron, 2001A&A...374...92V 2001A&A...374...92V, Cat. VII/224
18 = Chavushyan et al., 2001ARep...45...79C 2001ARep...45...79C
19 = Afanasiev et al., 2005, Cat. J/AZh/82/420
20 = Stickel & Kuehr, 1996, Cat. J/A+AS/115/11
--------------------------------------------------------------------------------
Table 3. Characteristics of the two samples
--------------------------------------------------------------------------------
Parametres Sample S(4.85GHz)<200mJy Sample S(4.85GHz)>200mJy
--------------------------------------------------------------------------------
Declination 10-12.5 deg(J2000) 74-75 deg (J2000)
--------------------------------------------------------------------------------
All Steep Flat All Steep Flat
--------------------------------------------------------------------------------
Number of sources 153 70 83 63 36 27
Object identified 112(73%) 41(59%) 71(86%) 31(49%) 14( 39%) 18(67%)
Object classified 108(71%) 39(56%) 69(83%) 28(44%) 11( 30%) 17(63%)
among them:
Galaxies 34(31%) 24(62%) 10(14%) 14(50%) 11(100%) 3(18%)
Quasars & BL Lac objects 74(69%) 15(38%) 59(86%) 14(50%) none 14(82%)
Redshift of the galaxies 0.24(0.14) ... ... 0.25(0.19) ... ...
Redshift of the quasars 1.42(0.75) ... ... 1.3(0.65) ... ...
Mean spectral index ... -0.82 ... ... -0.83 ...
--------------------------------------------------------------------------------
Note: All = the all sample
Steep = steep-spectrum sources
Flat = flat-spectrum sources
--------------------------------------------------------------------------------
(End) Veta Avedisova (INASAN) 08-Jan-2007