| Title: |
Interstellar Scintillation Monitoring of the RadioAstron Blazars |
| Authors: |
Liu, Jun, Krichbaum, Thomas P., Bignall, Hayley, Liu, Xiang, Kraus, Alex, Kovalev, Yuri Y., Sokolovsky, Kirill V., Cimò, Giuseppe, Zensus, J. Anton |
| Source: |
POS(EVN2018)112 |
| Publication Year: |
2019 |
| Collection: |
Astrophysics |
| Subject Terms: |
Astrophysics - Astrophysics of Galaxies, Astrophysics - High Energy Astrophysical Phenomena |
| More Details: |
The RadioAstron space radio telescope provides a unique opportunity to study the extreme brightness temperatures ($\mathrm{T_B }$) in AGNs with unprecedented long baselines of up to 28 Earth diameters. Since interstellar scintillation (ISS) may affect the visibilities observed with space VLBI (sVLBI), a complementary ground based flux density monitoring of the RadioAstron targets, which is performed near in time to the VLBI observation, could be beneficial. The combination/comparison with the sVLBI data can help to unravel the relative influence of source intrinsic and ISS induced effects, which in the end may alter the conclusions on the $\mathrm{T_B }$ measurements from sVLBI. Since 2013, a dedicated monitoring program has been ongoing to observe the ISS of RadioAstron AGN targets with a number of radio telescopes. Here we briefly introduce the program and present results from the statistical analysis of the Effelsberg monitoring data. We discuss the possible effects of ISS on $\mathrm{T_B }$ measurements for the RadioAstron target B0529+483 as a case study.
Comment: Proceedings for the 14th European VLBI Network Symposium & Users Meeting (EVN 2018) 8-11 October 2018, Granada, Spain |
| Document Type: |
Working Paper |
| Access URL: |
http://arxiv.org/abs/1909.01043 |
| Accession Number: |
edsarx.1909.01043 |
| Database: |
arXiv |
