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## Interstellar Plasma Scattering Effects Studied with Radioastron

Transactions of IAA RAS, issue 40, 138–142 (2017)

Keywords: VLBI, Radioastron, Pulsars, Interstellar medium

### Abstract

On behalf of the Radioastron pulsar group this report presents an overview of the studies which were done with the Radioastron space radio telescope during the first five years of mission operation, including the early and key science programs. Space-VLBI observations of pulsars with the highest angular resolution revealed the new interstellar plasma scattering effects, such as resolved substructure in the scattering disk. Diameters of the scattering disks were measured for several pulsars and the distances to the effective scattering screens were estimated. For close pulsars the layers of scattering plasma were detected to be located relatively close to the Sun (0.17–100 pc). Such layers might be responsible for fast flux variations of compact extragalactic radio sources. A new insight on the interstellar scattering was demonstrated by study of the instantaneous visibilities which were measured with the Space-VLBI observations of giant pulses from the Crab pulsar.

### Citation

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A. Andrianov, M. V. Popov, N. Bartel, H. Bignall, C. Gwinn, M. Johnson, D. Jauncey, E. Fadeef, B. Ch. Joshi, N. Kardashev, R. Karuppusamy, Yu. Y. Kovalev, M. Kramer, A. Rudnitskiy, V. Shishov, T. Smirnova, V. A. Soglasnov, A. Zensus. Interstellar Plasma Scattering Effects Studied with Radioastron // Transactions of IAA RAS. — 2017. — Issue 40. — P. 138–142. @article{andrianov2017, abstract = {On behalf of the Radioastron pulsar group this report presents an overview of the studies which were done with the Radioastron space radio telescope during the first five years of mission operation, including the early and key science programs. Space-VLBI observations of pulsars with the highest angular resolution revealed the new interstellar plasma scattering effects, such as resolved substructure in the scattering disk. Diameters of the scattering disks were measured for several pulsars and the distances to the effective scattering screens were estimated. For close pulsars the layers of scattering plasma were detected to be located relatively close to the Sun (0.17–100 pc). Such layers might be responsible for fast flux variations of compact extragalactic radio sources. A new insight on the interstellar scattering was demonstrated by study of the instantaneous visibilities which were measured with the Space-VLBI observations of giant pulses from the Crab pulsar.}, author = {A. Andrianov and M.~V. Popov and N. Bartel and H. Bignall and C. Gwinn and M. Johnson and D. Jauncey and E. Fadeef and B.~Ch. Joshi and N. Kardashev and R. Karuppusamy and Yu.~Y. Kovalev and M. Kramer and A. Rudnitskiy and V. Shishov and T. Smirnova and V.~A. Soglasnov and A. Zensus}, issue = {40}, journal = {Transactions of IAA RAS}, keyword = {VLBI, Radioastron, Pulsars, Interstellar medium}, pages = {138--142}, title = {Interstellar Plasma Scattering Effects Studied with Radioastron}, url = {http://iaaras.ru/en/library/paper/1693/}, year = {2017} } TY - JOUR TI - Interstellar Plasma Scattering Effects Studied with Radioastron AU - Andrianov, A. AU - Popov, M. V. AU - Bartel, N. AU - Bignall, H. AU - Gwinn, C. AU - Johnson, M. AU - Jauncey, D. AU - Fadeef, E. AU - Joshi, B. Ch. AU - Kardashev, N. AU - Karuppusamy, R. AU - Kovalev, Yu. Y. AU - Kramer, M. AU - Rudnitskiy, A. AU - Shishov, V. AU - Smirnova, T. AU - Soglasnov, V. A. AU - Zensus, A. PY - 2017 T2 - Transactions of IAA RAS IS - 40 SP - 138 AB - On behalf of the Radioastron pulsar group this report presents an overview of the studies which were done with the Radioastron space radio telescope during the first five years of mission operation, including the early and key science programs. Space-VLBI observations of pulsars with the highest angular resolution revealed the new interstellar plasma scattering effects, such as resolved substructure in the scattering disk. Diameters of the scattering disks were measured for several pulsars and the distances to the effective scattering screens were estimated. For close pulsars the layers of scattering plasma were detected to be located relatively close to the Sun (0.17–100 pc). Such layers might be responsible for fast flux variations of compact extragalactic radio sources. A new insight on the interstellar scattering was demonstrated by study of the instantaneous visibilities which were measured with the Space-VLBI observations of giant pulses from the Crab pulsar. UR - http://iaaras.ru/en/library/paper/1693/ ER -