Rapid variability of the radio flux density of 0524 + 034

Gorshkov, A. G.; Konnikova, V. K.; Мингалиев, М. Г.

doi:10.1134/1.163837

Cited by 16 publications

(32 citation statements)

References 8 publications

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“…A flux density variability on a time scale less than 10 days was found in the simultaneous observations carried out with the RATAN-600 radio telescope in 1998 (Figure 1). The rapid flux density variations are correlated at all frequencies, at which the variability is revealed, including the optically thick part of the spectrum (Gorshkov et al 2000). Here, we report the results of the first measurements of a VLBI structure of 0524+034 with resolution of 1-2 mas.…”

Section: Introduction Observations and Resultsmentioning

confidence: 89%

“…More than 90% of the total emission of 0524+034 is coming from the mas scale. The recent broad-band spectrum measurements were conducted nearly to and after the EVN experiment (for the method of observations and data reduction see Kovalev et al 1999;Gorshkov et al 2000). The rapid changes of the broad-band spectrum were confirmed, although the flux had dropped several times since 1998.…”

Section: Introduction Observations and Resultsmentioning

confidence: 99%

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VLBI and Broad-Band Radio Spectra Study of the Strongly Variable Extragalactic Object 0524+034

Kovalev¹,

Gorshkov²,

Konnikova³

et al. 2001

Symp. - Int. Astron. Union

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Abstract. Results of the first measurements of a VLBI structure of 0524+034 at 6 em at the EVN+HartRAO in 1999 and recent broad-band spectra monitoring data are reported. We suppose that precession of the relativistic jet can be one of the possible mechanisms to account for the observed milliarcsecond structure and the strong long-term variations of the spectrum. The detected rapid changes may be interpreted as a propagation of a shock in the inhomogeneous jet plasma, but interstellar scintillations can not be ruled out on the basis of available data.

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Section: Introduction Observations and Resultsmentioning

confidence: 89%

Section: Introduction Observations and Resultsmentioning

confidence: 99%

VLBI and Broad-Band Radio Spectra Study of the Strongly Variable Extragalactic Object 0524+034

Kovalev¹,

Gorshkov²,

Konnikova³

et al. 2001

Symp. - Int. Astron. Union

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“…After background subtraction 3 Steep spectrum radio sources rarely exhibit variations at frequencies above 1 GHz except for the objects found to host a compact component, which is responsible for flux variations [30,31].…”

Section: Sample Of Rcr Catalog Sources Used To Search For Variable Obmentioning

confidence: 99%

“…respectively), the angles dH averaged over all surveys (column 8), 6 and spectral indices α at 3.94 GHz (column 9). The asterisks (*)…”

Section: Revealing Variable Objects Among the Sourcesmentioning

confidence: 99%

“…To confirm the variability of the objects with positive long-term variability indices, we use statistical techniques similar to those employed in [3,13,[34][35][36]. We compute the absolute ∆F and relative V χ variability amplitudes as well as the weighted average flux F of the source, weighted average root mean square error σ , and the χ criterion for the number of degrees of freedom df = n − 1, where n is the number of surveys.…”

Section: Analysis Of the Statistical Properties Of The Sourcesmentioning

confidence: 99%

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Search for variable sources using data of “Cold” surveys

Majorova

Желенкова

2013

Astrophys. Bull.

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We search for variable sources, using the data of the surveys conducted on the RATAN-600 radio telescope in 1980-1994 at 3.94 GHz. To test the radio sources of the RCR (RATAN Cold Refined) catalog for variability, we estimated the long-term variability indices V of the studied objects, their relative variability amplitudes V χ , and the χ 2 probabilities p. Out of about two hundred considered sources, 41 proved to have positive long-term variability indices, suggesting that these sources may be variable. Fifteen objects can be considered to be reliably variable according to the χ 2 criterion p > 0.98, three of these sources have χ 2 probabilities p ≥ 0.999. The corresponding probabilities for six sources lie in the 0.95 < p < 0.98 interval, and those of the remaining 20 objects in the 0.73 ≤ p < 0.95 interval. Twenty-four of 41 objects are variable or possibly variable in the optical range, and five objects are known variable radio sources. We construct the light curves and spectra for the sources with positive long-term variability indices.

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