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

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. LisakovA. 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

^*Corresponding author for this work

Research output: Contribution to journal › Article › Scientific › peer-review

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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).

Original language	English
Pages (from-to)	535-554
Number of pages	20
Journal	Solar System Research
Volume	51
Issue number	7
DOIs	https://doi.org/10.1134/S0038094617070085
Publication status	Published - 1 Dec 2017
MoE publication type	A1 Journal article-refereed

Keywords

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

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Kardashev, N. S., Alakoz, A. V., Andrianov, A. S., Artyukhov, M. I., Baan, W., Babyshkin, V. E., Bartel, N., Bayandina, O. S., Val’tts, I. E., Voitsik, P. A., Vorobyov, A. Z., Gwinn, C., Gomez, J. L., Giovannini, G., Jauncey, D., Johnson, M., Imai, H., Kovalev, Y. Y., Kurtz, S. E., ... Edwards, P. (2017). RadioAstron Science Program Five Years after Launch: Main Science Results. Solar System Research, 51(7), 535-554. https://doi.org/10.1134/S0038094617070085

@article{4d68bb4d65984a23ba3057ae9ca67f2d,

title = "RadioAstron Science Program Five Years after Launch: Main Science Results",

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

author = "Kardashev, {N. S.} and Alakoz, {A. V.} and Andrianov, {A. S.} and Artyukhov, {M. I.} and W. Baan and Babyshkin, {V. E.} and N. Bartel and Bayandina, {O. S.} and Val{\textquoteright}tts, {I. E.} and Voitsik, {P. A.} and Vorobyov, {A. Z.} and C. Gwinn and Gomez, {J. L.} and G. Giovannini and D. Jauncey and M. Johnson and H. Imai and Kovalev, {Y. Y.} and Kurtz, {S. E.} and Lisakov, {M. M.} and Lobanov, {A. P.} and Molodtsov, {V. A.} and Novikov, {B. S.} and Pogodin, {A. V.} and Popov, {M. V.} and Privesenzev, {A. S.} and Rudnitski, {A. G.} and Rudnitski, {G. M.} and T. Savolainen and Smirnova, {T. V.} and Sobolev, {A. M.} and Soglasnov, {V. A.} and Sokolovsky, {K. V.} and Filippova, {E. N.} and Khartov, {V. V.} and Churikova, {M. E.} and Shirshakov, {A. E.} and Shishov, {V. I.} and P. Edwards",

year = "2017",

month = dec,

day = "1",

doi = "10.1134/S0038094617070085",

language = "English",

volume = "51",

pages = "535--554",

journal = "Solar System Research",

issn = "0038-0946",

publisher = "MAIK Nauka/Interperiodica",

number = "7",

}

Kardashev, NS, Alakoz, AV, Andrianov, AS, Artyukhov, MI, Baan, W, Babyshkin, VE, Bartel, N, Bayandina, OS, Val’tts, IE, Voitsik, PA, Vorobyov, AZ, Gwinn, C, Gomez, JL, Giovannini, G, Jauncey, D, Johnson, M, Imai, H, Kovalev, YY, Kurtz, SE, Lisakov, MM, Lobanov, AP, Molodtsov, VA, Novikov, BS, Pogodin, AV, Popov, MV, Privesenzev, AS, Rudnitski, AG, Rudnitski, GM, Savolainen, T, Smirnova, TV, Sobolev, AM, Soglasnov, VA, Sokolovsky, KV, Filippova, EN, Khartov, VV, Churikova, ME, Shirshakov, AE, Shishov, VI & Edwards, P 2017, 'RadioAstron Science Program Five Years after Launch: Main Science Results', Solar System Research, vol. 51, no. 7, pp. 535-554. https://doi.org/10.1134/S0038094617070085

TY - JOUR

T1 - RadioAstron Science Program Five Years after Launch

T2 - Main Science Results

AU - Kardashev, N. S.

AU - Alakoz, A. V.

AU - Andrianov, A. S.

AU - Artyukhov, M. I.

AU - Baan, W.

AU - Babyshkin, V. E.

AU - Bartel, N.

AU - Bayandina, O. S.

AU - Val’tts, I. E.

AU - Voitsik, P. A.

AU - Vorobyov, A. Z.

AU - Gwinn, C.

AU - Gomez, J. L.

AU - Giovannini, G.

AU - Jauncey, D.

AU - Johnson, M.

AU - Imai, H.

AU - Kovalev, Y. Y.

AU - Kurtz, S. E.

AU - Lisakov, M. M.

AU - Lobanov, A. P.

AU - Molodtsov, V. A.

AU - Novikov, B. S.

AU - Pogodin, A. V.

AU - Popov, M. V.

AU - Privesenzev, A. S.

AU - Rudnitski, A. G.

AU - Rudnitski, G. M.

AU - Savolainen, T.

AU - Smirnova, T. V.

AU - Sobolev, A. M.

AU - Soglasnov, V. A.

AU - Sokolovsky, K. V.

AU - Filippova, E. N.

AU - Khartov, V. V.

AU - Churikova, M. E.

AU - Shirshakov, A. E.

AU - Shishov, V. I.

AU - Edwards, P.

PY - 2017/12/1

Y1 - 2017/12/1

N2 - 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).

AB - 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).

KW - active galactic nuclei (AGN)

KW - cosmic masers

KW - ground-space interferometer

KW - interstellar scattering

KW - pulsars

KW - quasars

KW - stratigraphy

KW - very long baseline interferometry (VLBI)

UR - http://www.scopus.com/inward/record.url?scp=85042474423&partnerID=8YFLogxK

U2 - 10.1134/S0038094617070085

DO - 10.1134/S0038094617070085

M3 - Article

AN - SCOPUS:85042474423

SN - 0038-0946

VL - 51

SP - 535

EP - 554

JO - Solar System Research

JF - Solar System Research

IS - 7

ER -

RadioAstron Science Program Five Years after Launch: Main Science Results

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Keywords

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