XAO OpenIR  > 射电天文研究室  > 星系宇宙学研究团组
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
Source PublicationGalaxies
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
Indexed By其他
Citation statistics
Document Type期刊论文
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.
Files in This Item:
File Name/Size DocType Version Access License
Liu-2018-Effelsberg (742KB)期刊论文出版稿开放获取CC BY-NC-SAView Application Full Text
Related Services
Recommend this item
Usage statistics
Export to Endnote
Google Scholar
Similar articles in Google Scholar
[Liu, Jun]'s Articles
[Bignall, Hayley]'s Articles
[Krichbaum, Thomas]'s Articles
Baidu academic
Similar articles in Baidu academic
[Liu, Jun]'s Articles
[Bignall, Hayley]'s Articles
[Krichbaum, Thomas]'s Articles
Bing Scholar
Similar articles in Bing Scholar
[Liu, Jun]'s Articles
[Bignall, Hayley]'s Articles
[Krichbaum, Thomas]'s Articles
Terms of Use
No data!
Social Bookmark/Share
File name: Liu-2018-Effelsberg Monitoring of a Sample of.pdf
Format: Adobe PDF
All comments (0)
No comment.

Items in the repository are protected by copyright, with all rights reserved, unless otherwise indicated.