Preprint Article Version 1 This version is not peer-reviewed

Effelsberg Monitoring of a Sample of RadioAstron Blazars

Version 1 : Received: 31 October 2017 / Approved: 31 October 2017 / Online: 31 October 2017 (04:18:48 CET)

A peer-reviewed article of this Preprint also exists.

Liu, J.; Bignall, H.; Krichbaum, T.P.; Liu, X.; Kraus, A.; Kovalev, Y.Y.; Sokolovsky, K.V.; Angelakis, E.; Zensus, J.A. Effelsberg Monitoring of a Sample of RadioAstron Blazars: Analysis of Intra-Day Variability. Galaxies 2018, 6, 49. Liu, J.; Bignall, H.; Krichbaum, T.P.; Liu, X.; Kraus, A.; Kovalev, Y.Y.; Sokolovsky, K.V.; Angelakis, E.; Zensus, J.A. Effelsberg Monitoring of a Sample of RadioAstron Blazars: Analysis of Intra-Day Variability. Galaxies 2018, 6, 49.

Journal reference: Galaxies 2018, 6, 49
DOI: 10.3390/galaxies6020049

Abstract

The launch of the RadioAstron space radio telescope provides a unique opportunity to study the extreme high brightness temperature of Active Galactic Nuclei (AGNs) with unprecedented long baselines of up to 28 Earth diameters. A coordinated ground-based flux density monitoring of RadioAstron targets is essential to determine the effect of interstellar scintillation (ISS) on the Space Very Long Baseline Interferometry (SVLBI) visibilities. Moreover, a combination/comparison of scintillation with SVLBI observations is expected to reveal the relative influence of source brightness temperature, compactness, and properties of the interstellar medium on the observed variability at centimeter wavelengths. In 2014 we started a RadioAstron target triggered flux monitoring with the Effelsberg 100-m radio telescope in support of this SVLBI mission. A total of 112 targets were observed during the five-session monitoring performed so far. In this paper we present a statistical study on the short-term flux density variability of the sample, which is focused on the variability characteristics and derived physical properties of the observed sources.

Subject Areas

galaxies; active -- method; statistical -- radio continuum; ISM

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