J/other/AstBu/74.348 164 GHz-peaked spectrum sources (Sotnikova+, 2019)
Multifrequency study of GHz-peaked spectrum sources.
Sotnikova Yu.V., Mufakharov T.V., Majorova E.K., Mingaliev M.G.,
Udovitskiy R.Yu., Bursov N.N., Semenova T.A.
<Astrophys. Bull., 74, 348 (2019)>
=2019AstBu..74..348S 2019AstBu..74..348S (SIMBAD/NED BibCode)
ADC_Keywords: Active gal. nuclei ; Galaxies, radio ; Radio continuum
Keywords: galaxies: general - galaxies: active - radio continuum: galaxies
Abstract:
Gigahertz-Peaked spectrum (GPS) sources are compact active galactic
nuclei, presumably young precursors of bright radio sources. The study
of GPS radio properties provides information about the features of
synchrotron radiation in extragalactic sources. Also in applied
research, GPS sources are useful as compact stationary radio sources
in the sky for astrometric purposes. This paper presents the results
of a multifrequency GPS study based on quasi-simultaneous measurements
with the RATAN-600 radio telescope during the 2006-2017 period. A
catalog of GPS spectral flux densities at six frequencies - 1.1, 2.3,
4.8, 7.7/8.2, 11.2, and 21.7GHz - is obtained. In addition, for the
analysis of radio spectra, data from low-frequency
surveysGLEAM(GaLactic and Extragalactic AllskyMurchisonwidefield array
survey) and TGSS (Tata institute for fundamental research GMRT Sky
Survey) and high-frequency measurements from Planck survey are used. A
total number of 164 GPS and candidates have been identified (17 of
them are new discoveries), which makes up a small fraction of GPS in
the initial sample of bright AGNs - about 2%. The physical properties
and formation conditions of synchrotron radiation is found to be quite
different in GPS of different AGNs types. The deficit of distant GPS
(z>2) with low maximum frequencies (less than 1GHz) has been
confirmed. The existing "size-peak frequency" anticorrelation is
continuous. The continuum radio spectra are found to become
statistically steeper with increasing redshift.
Description:
We have studied the complete sample of GPS source and candidates
(S5GHz>200mJy) from Mingaliev et al. (2013, Cat.
J/other/AstBu/68.262). In that work a total number of 467 radio
sources with a spectral maximum were selected, and 112 candidates were
considered as GPS sources. GPS objects and candidate from this list
were observed with the RATAN-600 within the framework of a planned
research program in 2006-2017. Based on the GPS selection criteria
(see Mingaliev et al., 2013, Cat. J/other/AstBu/68.262; O'Dea et al.,
1991ApJ...380...66O 1991ApJ...380...66O; Mingaliev et al., 2011ARep...55..187M 2011ARep...55..187M; Mingaliev
et al.,2012, Cat. J/A+A/544/A25; De Vries et al.,
1997A&A...321..105D 1997A&A...321..105D), we selected 164 GPS objects and candidates to
GPS objects. Seventeen among them (marked with *) are identified for
the first time. We also marked with asterisks * 30 more objects, which
we identified for the first time as GPS candidates in our earlier
paper (Mingaliev et al., 2013, Cat. J/other/AstBu/68.262). We present
two tables, one with parameters of objects and another table with the
measured multifrequency flux densities during 2006-2017 monitoring at
the RATAN-600.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 97 164 Parameters of 164 objects
table2.dat 91 907 Flux densities
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See also:
J/A+A/544/A25 : GPS radio sources multifrequency study (Mingaliev+ 2012)
J/other/AstBu/68.262 : Sample of 467 GPS candidates (Mingaliev+, 2013)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- NVSS NVSS Name (HHMMSS+DDMMSS J2000)
14 A1 --- n_NVSS [*] Note on NVSS (1)
16- 18 A3 --- SpType Spectral type:
GPS, HFP, CSS or candidate 'g'
20- 22 A3 --- OptType Optical type (2)
24- 27 F4.2 --- z ? Redshift (2)
29- 32 F4.1 GHz nuObs Synchrotron peak frequency in the
observer's frame
34- 37 F4.1 GHz nuInt ? Synchrotron peak frequency in the
reference frame
39- 43 F5.3 --- alpha-below ? Spectral index in optical thick region
45- 49 F5.3 --- e_alpha-below ? rms uncertainty on alpha-below
51- 56 F6.3 --- alpha-above Spectral index in optical thin region
58- 62 F5.3 --- e_alpha-above rms uncertainty on alpha-above
64- 67 F4.1 --- alpha-353-857 ? Spectral index in the
range 353-857GHz
69- 71 F3.1 --- e_alpha-353-857 ? rms uncertainty on alpha-353-857
73- 75 F3.1 --- FWHM Full width at half maximum of the
radio spectrum
77- 80 F4.1 --- Var-11.2 ? Variability index at 11.2GHz
82- 86 A5 --- Morph Radio morphology from the literature
88- 97 A10 --- AGNtype AGN type (3)
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Note (1): * for the 17 objects identified for the first time, and 30 more
objects, which we identified for the first time as GPS candidates in our
earlier paper (Mingaliev et al., 2013, Cat. J/other/AstBu/68.262).
Note (2): From NED (NASA/IPAC Extragalactic Database)
Note (3): The blazar type according to the Roma-BZCAT catalogue 5d edition
(Massaro et al., 2009A&A...495..691M 2009A&A...495..691M, Cat. J/A+A/495/691)
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 13 A13 --- NVSS NVSS name (HHMMSS+DDMMSS, J2000)
15- 21 I7 --- JD Julian date
23- 28 F6.3 Jy S21.7 ? Flux density at 21.7GHz
30- 33 F4.2 Jy e_S21.7 ? rms uncertainty on flux density at 21.7GHz
35- 40 F6.3 Jy S11.2 ? Flux density at 11.2GHz
42- 45 F4.2 Jy e_S11.2 ? rms uncertainty on flux density at 11.2GHz
47- 52 F6.3 Jy S7.7/8.2 ? Flux density at 7.7 or 8.2GHz
54- 57 F4.2 Jy e_S7.7/8.2 ? rms uncertainty on flux density
at 7.7 or 8.2GHz
59- 64 F6.3 Jy S4.8 ? Flux density at 4.8GHz
66- 69 F4.2 Jy e_S4.8 ? rms uncertainty on flux density at 4.8 GHz
71- 75 F5.3 Jy S2.3 ? Flux density at 2.3GHz
77- 80 F4.2 Jy e_S2.3 ? rms uncertainty on flux density at 2.3 GHz
82- 86 F5.3 Jy S1/1.3 ? Flux density at 1 or 1.3GHz
88- 91 F4.2 Jy e_S1/1.3 ? rms uncertainty on flux density
at 1 or 1.3GHz
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Acknowledgements: Yu. Sotnikova. sjv(at)sao.ru
References:
Mingaliev et al., 2013AstBu..68..262M 2013AstBu..68..262M, Cat. J/other/AstBu/68.262
(End) Yu. Sotnikova [SAO, Russia], Patricia Vannier [CDS 16-Dec-2019