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J/A+A/544/A25       GPS radio sources multifrequency study   (Mingaliev+, 2012)

Multifrequency study of GHz-peaked spectrum sources and candidates with the RATAN-600 radio telescope. Mingaliev M.G., Sotnikova Yu.V., Torniainen I., Tornikoski M., Udovitskiy R.Yu. <Astron. Astrophys., 544, A25 (2012)> =2012A&A...544A..25M
ADC_Keywords: QSOs ; Active gal. nuclei ; Radio sources Keywords: galaxies: active - galaxies: general - radio continuum: galaxies Abstract: Gigahertz peaked spectrum (GPS) radio sources are a class of extragalactic radio sources characterized by a spectral peak in the gigahertz domain. They are a mixed class of quasars and galaxies. A large proportion of the sources studied in the literature have only few data points in the radio domain, and the determination of variability and shape of the simultaneous spectra is inadequate. Sources currently included in the GPS source lists are very heterogeneous. We present the observational results from 12 observing campaigns (carried out between 2006 and 2010) at the RATAN-600 radio telescope to obtain the simultaneous radio spectra, which is valuable and necessary to derive genuine GPS sources from flat-spectrum radio sources caught in a flaring state when their spectra are temporarily inverted. The sample contains both quasar- and galaxy-type GPS (122 sources) identified in the literature. Description: The observations were carried out at six frequencies (1.1, 2.3, 4.8, 7.7, 11.2 and 21.7GHz), during 12 observing campaigns: July and October 2006, March and April 2007, September 2007, April and June 2008, November and October 2008, April, October and November 2009, January, April, May, and July 2010. The flux densities were measured at several epochs. A six-frequency broadband radio spectrum was obtained by observing simultaneously with an accuracy of up to a minute at 1.4, 2.7, 3.9, 6.25, 13, and 30cm. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file sources.dat 27 122 List of studied sources table2.dat 93 597 The flux densities of GPS sources and candidates for several epochs (RATAN-600 observations 2006-10) table3.dat 85 69 Parameters of radio spectra for the sources with spectral maximum (RATAN-600 observations 2006-10)
See also: VIII/65 : 1.4GHz NRAO VLA Sky Survey (NVSS) (Condon+ 1998) J/A+AS/132/341 : ROSAT GPS optical identification (Motch+ 1998) J/A+AS/135/273 : 408MHz obs. of GPS sources from JVAS survey (Marecki+ 1999) J/A+A/369/380 : CSS/GPS radio sources VLA observations (Fanti+, 2001) J/MNRAS/373/1203 : The outer Galaxy at 1420 and 408MHz (Kerton, 2006) J/A+A/469/451 : Radio continuum spectra of GPS galaxies (Torniainen+, 2007) J/A+A/463/97 : Optical observations of GPS radio sources (Labiano+, 2007) J/A+A/482/483 : GHz-peaked spectrum (GPS) sources (Torniainen+, 2008) J/A+A/489/49 : Observations of candidate GPS sources (Vollmer+, 2008) J/MNRAS/416/1135 : Unbiased sample of CSS and GPS (Randall+, 2011) Byte-by-byte Description of file: sources.dat
Bytes Format Units Label Explanations
1- 13 A13 --- NVSS NVSS name (HHMMSS+DDMMSS) 15- 17 A3 --- Type [G QSO -] Optical class 19- 22 A4 --- sp Type if RATAN-600 spectra (1) 24- 27 F4.2 --- z ?=- Redshift
Note (1): Type of RATAN-600 spectra as follows: max = spectrum with maximum in the RATAN-600 frequency range max1 = possible spectrum with a maximum in low frequencies not accessible to RATAN-600 max2 = variable spectrum with maximum of Var{DELTA}S>2.5 at 21-4.8GHz f = flat spectrum (0≥α≥-0.5) ris = rising spectrum (α>0) s = steep spectrum (spectral index α≤-0.5) c = complex spectrum (one or more minima)
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 13 A13 --- NVSS NVSS name (HHMMSS+DDMMSS) 15- 21 F7.2 "YYYY/MM" Date Observation epoch at RATAN-600 23- 27 F5.3 Jy S21.7 ?=- Flux density at 21.7GHz 29- 33 F5.3 Jy e_S21.7 ? rms uncertainty on S21.7 (1) 34- 39 F6.3 Jy S11.2 ?=- Flux density at 11.2GHz 40 A1 --- f_S11.2 [*] Corrected at CDS (2) 41- 45 F5.3 Jy e_S11.2 ? rms uncertainty on S11.2 (1) 46- 51 F6.3 Jy S7.7 ?=- Flix density at 7.7GHz 52 A1 --- f_S7.7 [*] Corrected at CDS (2) 53- 57 F5.3 Jy e_S7.7 ? rms uncertainty on S7.7 (1) 58- 63 F6.3 Jy S4.8 ?=- Flux density at 4.8GHz 64 A1 --- f_S4.8 [*] Corrected at CDS (2) 65- 69 F5.3 Jy e_S4.8 ? rms uncertainty on S4.8 (1) 71- 75 F5.3 Jy S2.3 ?=- Flux density at 2.3GHz 77- 81 F5.3 Jy e_S2.3 ? rms uncertainty on S2.3 (1) 82- 87 F6.3 Jy S1 ? Flux density at 1GHz 88 A1 --- f_S1 [*] Corrected at CDS (2) 89- 93 F5.3 Jy e_S1 ? rms uncertainty on S1
Note (1): Uncertainties for the corresponding frequencies, including the uncertainty in the source's antenna temperature and the calibration curve. Note (2): a few fluxes above 10Jy apparently miss the '1' leftmost digit in the original table, fixed at CDS. See also the "History" section below.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 13 A13 --- NVSS NVSS name (HHMMSS+DDMMSS) 15- 17 A3 --- Type [G QSO -] Optical class 19- 21 A3 --- gps Indication of GPS and candidates 23- 26 F4.2 --- z ?=- Redshift 28- 34 F7.1 MHz Fpeak Frequency in the observer frame 36- 40 F5.3 --- SIb ?=- Spectral index of optically thick part of the spectra (αbelow) 42- 46 F5.3 --- e_SIb ? Estimated rms uncertainty on SIb 48- 53 F6.3 --- SIa Spectral index of optically thin part of the spectra (αabove) 55- 59 F5.3 --- e_SIa Estimated rms uncertainty on SIba 61- 63 F3.1 --- FHWM Value of FWHM in decades of frequency 65- 68 F4.1 % V4.8 Variability index at 4.8GHz (1) 70- 74 F5.1 % V7.7 Variability index at 7.7GHz (1) 76- 79 F4.1 % V11.2 Variability index at 11.2GHz (1) 81- 85 F5.1 % V21.7 Variability index at 21.7GHz (1)
Note (1): A negative value of index may exist when the estimated error is greater than the observed scatter of the data.
History: * 15-Oct-2012: From electronic version of the journal * 20-Dec-2012: in table2, fluxes should be above 10Jy missed their leftmost '1' (communicated by H. Andernach). Such fluxes are marked with as '*' in the table.
(End) Patricia Vannier [CDS] 15-Oct-2012
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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