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Effelsberg Monitoring of a Sample of RadioAstron Blazars: Analysis of Intra-Day Variability
Liu, Jun1,2,3; Bignall, Hayley4; Krichbaum, Thomas1; Liu, Xiang2,3; Kraus, Alex1; Kovalev, Yuri1,5,6; Sokolovsky, Kirill5,7,8; Angelakis, Emmanouil1; Zensus, J.1
2018-04-01
Source PublicationGalaxies
ISSN2075-4434
Volume6Issue:2Pages:49
Contribution Rank2
AbstractWe present the first results of an ongoing intra-day variability (IDV) flux density monitoring program of 107 blazars, which were selected from a sample of RadioAstron space very long baseline interferometry (VLBI) targets. The~IDV observations were performed with the Effelsberg 100-m radio telescope at 4.8\,GHz, focusing on the statistical properties of IDV in a relatively large sample of compact active galactic nuclei (AGN). We investigated the dependence of rapid ($<$3 day) variability on various source properties through a likelihood approach. We found that the IDV amplitude depends on flux density and that fainter sources vary by about a factor of 3 more than their brighter counterparts. We also found a significant difference in the variability amplitude between inverted- and flat-spectrum radio sources, with the former exhibiting stronger variations. $\gamma$-ray loud sources were found to vary by up to a factor 4 more than $\gamma$-ray quiet ones, with 4$\sigma$ significance. However a galactic latitude dependence was barely observed, which suggests that it is predominantly the intrinsic properties (e.g., angular size, core-dominance) of the blazars that determine how they scintillate, rather than the directional dependence in the interstellar medium (ISM). We showed that the uncertainty in the VLBI brightness temperatures obtained from the space VLBI data of the RadioAstron satellite can be as high as $\sim$70\% due to the presence of the rapid flux density variations. Our statistical results support the view that IDV at centimeter wavelengths is predominantly caused by interstellar scintillation (ISS) of the emission from the most compact, core-dominant region in an AGN.
Correspondent Emailjliu@mpifr-bonn.mpg.de
Keywordgalaxies active-method statistical-radio continuum ISM
DOI10.3390/galaxies6020049
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Indexed By其他
Language英语
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Document Type期刊论文
Identifierhttp://ir.xao.ac.cn/handle/45760611-7/3216
Collection射电天文研究室_星系宇宙学研究团组
Affiliation1.Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn, Germany;
2.Xinjiang Astronomical Observatory, CAS, 150 Science 1-Street, Urumqi 830011, China;
3.Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Urumqi 830011, China;
4.CSIRO Astronomy and Space Science, P.O. Box 1130, Bentley, WA 6102, Australia;
5.Astro Space Center of Lebedev Physical Institute, Profsoyuznaya 84/32, 117997 Moscow, Russia;
6.Moscow Institute of Physics and Technology, Dolgoprudny, Institutsky per., 9, 141700 Moscow, Russia;
7.IAASARS, National Observatory of Athens, Vas. Pavlou & I. Metaxa, 15236 Penteli, Greece;
8.Sternberg Astronomical Institute, Moscow State University, Universitetskii pr. 13, 119992 Moscow, Russia
Recommended Citation
GB/T 7714
Liu, Jun,Bignall, Hayley,Krichbaum, Thomas,et al. Effelsberg Monitoring of a Sample of RadioAstron Blazars: Analysis of Intra-Day Variability[J]. Galaxies,2018,6(2):49.
APA Liu, Jun.,Bignall, Hayley.,Krichbaum, Thomas.,Liu, Xiang.,Kraus, Alex.,...&Zensus, J..(2018).Effelsberg Monitoring of a Sample of RadioAstron Blazars: Analysis of Intra-Day Variability.Galaxies,6(2),49.
MLA Liu, Jun,et al."Effelsberg Monitoring of a Sample of RadioAstron Blazars: Analysis of Intra-Day Variability".Galaxies 6.2(2018):49.
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