/ftp/cats/J_other/AstBu/68.262



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J/other/AstBu/68.262   Sample of 467 GPS candidates          (Mingaliev+, 2013)
The following files can be converted to FITS (extension .fit or fit.gz)
	table.dat
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Query from: http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=J/other/AstBu/68.262
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drwxr-xr-x 38 cats archive 4096 Aug 6 08:34 [Up] drwxr-xr-x 4 cats archive 288 May 26 2021 [TAR file] -rw-r--r-- 1 cats archive 471 Mar 15 2014 .message -r--r--r-- 1 cats archive 6452 Mar 15 2014 ReadMe -rw-r--r-- 1 cats archive 699 Mar 15 2014 +footg5.gif -rw-r--r-- 1 cats archive 5625 Mar 15 2014 +footg8.gif -r--r--r-- 1 cats archive 43468 Sep 12 2013 table.dat [txt] [txt.gz] [fits] [fits.gz] [html]
Beginning of ReadMe : J/other/AstBu/68.262 Sample of 467 GPS candidates (Mingaliev+, 2013) ================================================================================ Gigahertz-Peaked Spectrum (GPS) galaxies and quasars. Mingaliev M.G., Sotnikova Yu.V., Mufakharov T.V., Erkenov A.K., Udovitskiy R.Yu. <Astrophys. Bull., 68, 262 (2013)> =2013AstBu..68..262M ================================================================================ ADC_Keywords: Active gal. nuclei ; Galaxies, radio ; Radio continuum Keywords: galaxies: general - galaxies: active - radio continuum: galaxies Abstract: The results of a comprehensive analysis of continuous radio spectra of a sample of Gigahertz-Peaked Spectrum (GPS) sources are reported. The sources are selected from a flux-density-complete sample (S more or equal 200mJy at 4.8 or 5GHz) using multifrequency measurements of the RATAN-600 radio telescope and data from the CATS astrophysical catalogs support system. The analysis revealed a very small number (1-2%) of "classical" GPS objects, which is significantly less than the expected fraction of 10%. GPS galaxies are found to have narrower and steeper radio spectra than quasars. The low-frequency part of the spectrum is seen to become steeper with increasing redshift. Galaxies and quasars at the same z have comparable angular sizes, whereas their luminosities may differ by one order of magnitude. At large redshifts there is a deficit of objects with low (several GHz) peak frequencies. The number of GPS galaxies decreases sharply with redshift, and most of them are found at z between 0.01 and 1.81. GPS quasars are found at large redshifts, from 0.11 to 3.99. A quarter of the sample consists of blazars whose spectra may temporarily have a convex shape when the object is in active state. Description: We selected objects with convex radio spectra from a flux-density complete sample: S>=200mJy at 4.8 or 5GHz (we define the spectral index alpha such that Sprop.tonu^alpha^) using multifrequency measurements of the RATAN-600 radio telescope (2012A&A...544A..25M) and data from the CATS astrophysical catalogs support system (1997BaltA...6..275V). As a result, we selected 467 GPS candidates by spectral type, with redshift data available for 249 of these objects. The sample contains 118 galaxies, 187 quasars, and 162 sources without optical counterparts. For each source name in J2000 equatorial coordinates, the optical counterpart, redshift, peak frequency, radio flux density, spectral indexes, FWHM, blazar type, morphological type and variability are presented.

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