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Interstellar Scintillation Monitoring of the RadioAstron Blazars

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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
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  Data: Interstellar Scintillation Monitoring of the RadioAstron Blazars
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  Data: <searchLink fieldCode="AR" term="%22Liu%2C+Jun%22">Liu, Jun</searchLink><br /><searchLink fieldCode="AR" term="%22Krichbaum%2C+Thomas+P%2E%22">Krichbaum, Thomas P.</searchLink><br /><searchLink fieldCode="AR" term="%22Bignall%2C+Hayley%22">Bignall, Hayley</searchLink><br /><searchLink fieldCode="AR" term="%22Liu%2C+Xiang%22">Liu, Xiang</searchLink><br /><searchLink fieldCode="AR" term="%22Kraus%2C+Alex%22">Kraus, Alex</searchLink><br /><searchLink fieldCode="AR" term="%22Kovalev%2C+Yuri+Y%2E%22">Kovalev, Yuri Y.</searchLink><br /><searchLink fieldCode="AR" term="%22Sokolovsky%2C+Kirill+V%2E%22">Sokolovsky, Kirill V.</searchLink><br /><searchLink fieldCode="AR" term="%22Cimò%2C+Giuseppe%22">Cimò, Giuseppe</searchLink><br /><searchLink fieldCode="AR" term="%22Zensus%2C+J%2E+Anton%22">Zensus, J. Anton</searchLink>
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  Data: POS(EVN2018)112
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  Data: 2019
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  Data: Astrophysics
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  Data: 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.<br />Comment: Proceedings for the 14th European VLBI Network Symposium & Users Meeting (EVN 2018) 8-11 October 2018, Granada, Spain
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      – SubjectFull: Astrophysics - High Energy Astrophysical Phenomena
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