RATAN-600: the World's biggest reflector at the 'cross roads'

Parijskij, Yu. N.

doi:10.1109/74.229840

Cited by 34 publications

(11 citation statements)

References 3 publications

(2 reference statements)

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“…1, 2.3, 4.8, 7.7, 11.2, and 21.7 GHz (Parijskij 1993;Berlin & Friedman 1996). Data were reduced using the RATAN standard software FADPS (Flexible Astronomical Data Processing System) reduction package (Verkhodanov 1997).…”

Section: Ratanmentioning

confidence: 99%

SimultaneousPlanck,Swift, andFermiobservations of X-ray andγ-ray selected blazars

Giommi

Polenta

Lähteenmäki

et al. 2012

A&A

188

132

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We present simultaneous Planck, Swift, Fermi, and ground-based data for 105 blazars belonging to three samples with flux limits in the soft X-ray, hard X-ray, and γ-ray bands, with additional 5 GHz flux-density limits to ensure a good probability of a Planck detection. We compare our results to those of a companion paper presenting simultaneous Planck and multi-frequency observations of 104 radio-loud northern active galactic nuclei selected at radio frequencies. While we confirm several previous results, our unique data set allows us to demonstrate that the selection method strongly influences the results, producing biases that cannot be ignored. Almost all the BL Lac objects have been detected by the Fermi Large Area Telescope (LAT), whereas 30% to 40% of the flat-spectrum radio quasars (FSRQs) in the radio, soft X-ray, and hard X-ray selected samples are still below the γ-ray detection limit even after integrating 27 months of Fermi-LAT data. The radio to sub-millimetre spectral slope of blazars is quite flat, with α ∼ 0 up to about 70 GHz, above which it steepens to α ∼ −0.65. The BL Lacs have significantly flatter spectra than FSRQs at higher frequencies. The distribution of the rest-frame synchrotron peak frequency (ν of BL Lacs are much broader and are shifted to higher energies than those of FSRQs; their shapes strongly depend on the selection method. The Compton dominance of blazars, defined as the ratio of the inverse Compton to synchrotron peak luminosities, ranges from less than 0.2 to nearly 100, with only FSRQs reaching values larger than about 3. Its distribution is broad and depends strongly on the selection method, with γ-ray selected blazars peaking at ∼7 or more, and radio-selected blazars at values close to 1, thus implying that the common assumption that the blazar power budget is largely dominated by high-energy emission is a selection effect. A comparison of our multi-frequency data with theoretical predictions shows that simple homogeneous SSC models cannot explain the simultaneous SEDs of most of the γ-ray detected blazars in all samples. The SED of the blazars that were not detected by Fermi-LAT may instead be consistent with SSC emission. Our data challenge the correlation between bolometric luminosity and ν S peak predicted by the blazar sequence.

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Section: Ratanmentioning

confidence: 99%

SimultaneousPlanck,Swift, andFermiobservations of X-ray andγ-ray selected blazars

Giommi

Polenta

Lähteenmäki

et al. 2012

A&A

188

132

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“…Systematic monitoring was carried out during the period 2006–2008 for roughly one‐third of the sources. Observations were carried out in the transit (meridian) mode with the north and south sectors of the antenna (Korolkov & Pariiskii ; Parijskij ). The angular resolution in this mode of observations depends on the declination of the source being observed.…”

Section: Observationsmentioning

confidence: 99%

Simultaneous spectra and radio properties of BL Lacs

et al. 2017

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We present the results of nine years of the blazar observing programme at the RATAN-600 radio telescope (2005)(2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014). The data were obtained at six frequency bands (1. 1, 2.3, 4.8, 7.7, 11.2, 21.7 GHz) for 290 blazars, mostly BL Lacs. In addition, we used data at 37 GHz obtained quasi-simultaneously with the Metsahovi radio observatory for some sources. The sample includes blazars of three types: high-synchrotron peaked (HSP), low-synchrotron peaked (LSP), and intermediatesynchrotron peaked (ISP). We present several epochs of flux density measurements, simultaneous radio spectra, spectral indices and properties of their variability. The analysis of the radio properties of different classes of blazars showed that LSP and HSP BL Lac blazars are quite different objects on average. LSPs have higher flux densities, flatter spectra and their variability increases as higher frequencies are considered. On the other hand, HSPs are very faint in radio domain, tend to have steep low frequency spectra, and they are less variable than LSPs at all frequencies. Another result is spectral flattening above 7.7 GHz detected in HSPs, while an average LSP spectrum typically remains flat at both the low and high frequency ranges we considered.

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“…Observations were made in a transit mode at the north and south sectors of the antenna, and the multi-frequency broadband radio spectrum was obtained by observing simultaneously with an accuracy of up to 1−2 min (Parijskij 1993). An angular resolution in this mode of observations depends on a declination of a source being observed.…”

Section: Ratan-600 Observationsmentioning

confidence: 99%

RATAN-600 multi-frequency data for the BL Lacertae objects

Мингалиев

Sotnikova

Udovitskiy

et al. 2014

A&A

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Aims. We present a new catalogue of the RATAN-600 multi-frequency measurements for BL Lac objects. The purpose of this catalogue is to compile the BL Lac multi-frequency data that is acquired with the RATAN-600 simultaneously at several frequencies. The BL Lac objects emit a strongly variable and polarized non-thermal radiation across the entire electromagnetic spectrum from radio to γ rays and represent about 1% of known AGNs. They belong to the blazar population and differ from other blazars' featureless optical spectrum, which sometimes have absorption lines, or have weak and narrow emission lines. One of the most effective ways of studying the physics of BL Lacs is the use of simultaneous multi-frequency data. Methods. The multi-frequency broadband radio spectrum was obtained simultaneously with an accuracy of up to 1−2 min for four to six frequencies: 1.1, 2.3, 4.8, 7.7, 11.2, and 21.7 GHz. The catalogue is based on the RATAN-600 observations and on the data from: equatorial coordinate and redshift, R-band magnitude, synchrotron peak frequency, SED classes, and object type literature.Results. The present version of the catalogue contains RATAN-600 flux densities measurements over nine years (2006)(2007)(2008)(2009)(2010)(2011)(2012)(2013)(2014), radio spectra at different epochs, and their parameters of the catalogue for more than 300 BL Lacs objects and candidates. The BL Lacs list is constantly updated with new observational data of RATAN-600.

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RATAN-600: the World's biggest reflector at the 'cross roads'

Cited by 34 publications

References 3 publications

SimultaneousPlanck,Swift, andFermiobservations of X-ray andγ-ray selected blazars

SimultaneousPlanck,Swift, andFermiobservations of X-ray andγ-ray selected blazars

Simultaneous spectra and radio properties of BL Lacs

RATAN-600 multi-frequency data for the BL Lacertae objects

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