RadioAstron Science Program Five Years after Launch: Main Science Results

N. S. Kardashev; A. V. Alakoz; A. S. Andrianov; M. I. Artyukhov; W. Baan; V. E. Babyshkin; N. Bartel; O. S. Bayandina; I. E. Val’tts; P. A. Voitsik; A. Z. Vorobyov; C. Gwinn; J. L. Gomez; G. Giovannini; D. Jauncey; M. Johnson; H. Imai; Y. Y. Kovalev; S. E. Kurtz; M. M. Lisakov; A. P. Lobanov; V. A. Molodtsov; B. S. Novikov; A. V. Pogodin; M. V. Popov; A. S. Privesenzev; A. G. Rudnitski; G. M. Rudnitski; T. Savolainen; T. V. Smirnova; A. M. Sobolev; V. A. Soglasnov; K. V. Sokolovsky; E. N. Filippova; V. V. Khartov; M. E. Churikova; A. E. Shirshakov; V. I. Shishov; P. Edwards

doi:10.1134/S0038094617070085

RadioAstron Science Program Five Years after Launch: Main Science Results

Authors: Kardashev N.S.¹, Alakoz A.V.¹, Andrianov A.S.¹, Artyukhov M.I.², Baan W.³, Babyshkin V.E.², Bartel N.⁴, Bayandina O.S.¹, Val’tts I.E.¹, Voitsik P.A.¹, Vorobyov A.Z.², Gwinn C.⁵, Gomez J.L.⁶, Giovannini G.⁴, Jauncey D.⁷, Johnson M.⁸, Imai H.⁹, Kovalev Y.Y.¹, Kurtz S.E.¹⁰, Lisakov M.M.¹, Lobanov A.P.¹¹, Molodtsov V.A.², Novikov B.S.¹, Pogodin A.V.², Popov M.V.¹, Privesenzev A.S.², Rudnitski A.G.¹, Rudnitski G.M.¹², Savolainen T.¹³, Smirnova T.V.¹⁴, Sobolev A.M.¹⁵, Soglasnov V.A.¹, Sokolovsky K.V.¹, Filippova E.N.², Khartov V.V.², Churikova M.E.², Shirshakov A.E.², Shishov V.I.¹⁴, Edwards P.¹⁶
Affiliations:
1. Astro Space Center, Lebedev Physical Institute
2. Lavochkin Scientific and Production Association
3. ASTRON Netherlands Institute for Radio Astronomy
4. Department of Physics and Astronomy
5. University of California at Santa Barbara
6. Institute of Astrophysics of Andalusia
7. Research School of Astronomy and Astrophysics
8. Harvard-Smithsonian Center for Astrophysics
9. Graduate School of Science and Engineering
10. Center for Radio Astronomy and Astrophysics
11. Max-Planck-Institute for Radio Astronomy
12. Sternberg Astronomical Institute
13. Aalto University Metsähovi Radio Observatory
14. Pushchino Radio Astronomy Observatory, Astro Space Center, Lebedev Physical Institute
15. Ural Federal University
16. CSIRO Astronomy and Space Science
Issue: Vol 51, No 7 (2017)
Pages: 535-554
Section: Article
URL: https://journal-vniispk.ru/0038-0946/article/view/170841
DOI: https://doi.org/10.1134/S0038094617070085
ID: 170841

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Abstract

The RadioAstron ground-space interferometer provides the highest angular resolution achieved now in astronomy. The detection of interferometric fringes from quasars with this angular resolution on baselines of 100–200 thousand km suggests the brightness temperatures which exceed the Compton limit by two orders of magnitude. Polarimetric measurements on ground-space baselines have revealed fine structure testifying to recollimation shocks on scales of 100–250 μas and a helical magnetic field near the base of radio emission in BL Lacertae. Substructure within a the scattering disk of pulsar emission on interferometer baselines (from 60000 to 250000 km) was discovered. This substructure is produced by action of the interstellar interferometer with an effective baseline of about 1 AU and the effective angular resolution of better than 1 μas. Diameters of scattering disks were measured for several pulsars, and distances to diffusing screens were evaluated. The ground-space observations of sources of the maser radiation in lines of water and hydroxyl have shown that the maser sources in star-forming regions remain unresolved on baselines, which considerably exceed the Earth diameter. These very compact and bright features with angular sizes of about 20–60 μas correspond to linear sizes of about 5–10 million km (several solar diameters).

Keywords

stratigraphy, ground-space interferometer, very long baseline interferometry (VLBI), active galactic nuclei (AGN), quasars, pulsars, cosmic masers, interstellar scattering

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RadioAstron Science Program Five Years after Launch: Main Science Results

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Abstract

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About the authors

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