J/AZh/89/388 Flat-spectrum radio sources long-term variability (Gorshkov+, 2012)
Long-term variability of a complete sample of flat-spectrum radio sources at
declinations 10°-12°30' (J2000).
Gorshkov A.G., Konnikova V.K., Mingaliev M.G.
<Astron. Zh. 89, 388 (2012)>
=2012AZh....89..388G 2012AZh....89..388G
=2012ARep...56..345G 2012ARep...56..345G
ADC_Keywords: Radio sources ; QSOs
Abstract:
The paper reports the results of ten-year centimeter-wavelength
observations with the RATAN-600 radio telescope of a complete sample
of 83 flat-spectrum sources from the GB6 catalog of the MGB Survey
(Cat. VIII/40), with S4.85>200mJy at declinations
10°-12°30'. Starting in 2000, the observations were conducted
simultaneously at six frequencies in the range 0.97-21.7GHz.
Seventy-six sources (including 54 quasars) have been identified with
optical objects, which have redshifts in the range z=0.331-3.601.
Description:
The observations were conducted on the Northern Sector of the
RATAN-600 at 0.97, 2.3, 3.9 (4.85 since 2004), 7.7, 11.1, and 21.7GHz
on September 6-November 26, 2000; May 31-September 10, 2001;
October 31-November 10, 2001; June 19- September 23, 2002; May
15-August 19, 2004; December 1, 2005-March 12, 2006; September
18-29, 2006; May 1-30, 2007; October 7-28, 2007; June
17-September 1, 2008; September 4-20, 2009; December 21-29,
2009; January 4-13, 2010; June 12-July 8, 2010; September
26-October 17, 2010. In addition, the most variable sources were
observed on February 21-28, 2005.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 57 83 Identifications and variability indices
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See also:
VII/258 : Quasars and Active Galactic Nuclei (13th Ed.) (Veron+ 2010)
VIII/40 : GB6 catalog of radio sources (Gregory+ 1996)
J/MNRAS/329/700 : Optical IDs of JVAS using APM (Snellen+ 2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 2 I2 h RAh Radio right ascension (J2000)
4- 5 I2 min RAm Radio right ascension (J2000)
7- 12 F6.3 s RAs Radio right ascension (J2000)
14 A1 --- DE- Radio declination sign (J2000)
15- 16 I2 deg DEd Radio declination (J2000)
18- 19 I2 arcmin DEm Radio declination (J2000)
21- 25 F5.2 arcsec DEs Radio declination (J2000)
27- 28 A2 --- Cl [Q G L EF] Classification: Quasar, Galaxy,
BL Lac object, or Empty Field
30- 34 F5.3 --- z ?=- Redshift of the optical counterpart
36- 37 I2 --- r_z ?=- Redshift reference (2)
39- 42 F4.1 mag Bmag ?=- USNO B magnitude
44- 47 F4.2 --- V7.7 ?=- Variability index at 7.7GHz (3)
49- 52 F4.2 --- V11.1 ?=- Variability index at 11.1GHz (3)
54- 57 F4.2 --- V21.7 ?=- Variability index at 21.7GHz (3)
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Note (2): References as follows:
15 = Ceron-Cetty and Veron, 2010, Cat. VII/258
16 = Chavushyan et al., 2002ARep...46..697C 2002ARep...46..697C
17 = Snellen et al., 2002, Cat. J/MNRAS/329/700
18 = Bisikalo et al., 2005ARep...49..701B 2005ARep...49..701B
19 = Afanas'ev et al., 2006ARep...50..255A 2006ARep...50..255A
Note (3): The variability index is defined as:
V=[(Smax-σmag)-(Smin+σmin)]/[(Smax-σmag)+(Smin+σmin)],
where Smax and Smin are the maximum and minimum flux densities recorded during
the ten-year observations, and σmax and σmin are the corresponding
rms errors.
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 05-Jun-2012