The high brightness temperature of B0529+483 revealed by RadioAstron and implications for interstellar scattering

S. V. Pilipenko; Y. Y. Kovalev; A. S. Andrianov; U. Bach; S. Buttaccio; P. Cassaro; G. Cimò; P. G. Edwards; M. P. Gawroński; L. I. Gurvits; T. Hovatta; D. L. Jauncey; M. D. Johnson; Yu A. Kovalev; A. M. Kutkin; M. M. Lisakov; A. E. Melnikov; A. Orlati; A. G. Rudnitskiy; K. V. Sokolovsky; C. Stanghellini; P. de Vicente; P. A. Voitsik; P. Wolak; G. V. Zhekanis

doi:10.1093/mnras/stx2991

The high brightness temperature of B0529+483 revealed by RadioAstron and implications for interstellar scattering

S. V. Pilipenko^*, Y. Y. Kovalev, A. S. Andrianov, U. Bach, S. Buttaccio, P. Cassaro, G. Cimò, P. G. Edwards, M. P. Gawroński, L. I. Gurvits, T. Hovatta, D. L. Jauncey, M. D. Johnson, Yu A. Kovalev, A. M. Kutkin, M. M. Lisakov, A. E. Melnikov, A. Orlati, A. G. Rudnitskiy, K. V. SokolovskyC. Stanghellini, P. de Vicente, P. A. Voitsik, P. Wolak, G. V. Zhekanis

^*Corresponding author for this work

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

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Abstract

The high brightness temperatures, T_b ≳ 10¹³ K, detected in several active galactic nuclei by RadioAstron space VLBI observations challenge theoretical limits. Refractive scattering by the interstellar medium may affect such measurements. We quantify the scattering properties and the sub-mas scale source parameters for the quasar B0529+483. Using RadioAstron correlated flux density measurements at 1.7, 4.8, and 22 GHz on projected baselines up to 240 000 km we find two characteristic angular scales in the quasar core, about 100 and 10 μas. Some indications of scattering substructure are found. Very high brightness temperatures, T_b ≥ 10¹³ K, are estimated at 4.8 and 22 GHz even taking into account the refractive scattering. Our findings suggest a clear dominance of the particle energy density over the magnetic field energy density in the core of this quasar.

Original language	English
Pages (from-to)	3523-3534
Number of pages	12
Journal	Monthly Notices of the Royal Astronomical Society
Volume	474
Issue number	3
DOIs	https://doi.org/10.1093/mnras/stx2991
Publication status	Published - 1 Mar 2018

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Pilipenko, S. V., Kovalev, Y. Y., Andrianov, A. S., Bach, U., Buttaccio, S., Cassaro, P., Cimò, G., Edwards, P. G., Gawroński, M. P., Gurvits, L. I., Hovatta, T., Jauncey, D. L., Johnson, M. D., Kovalev, Y. A., Kutkin, A. M., Lisakov, M. M., Melnikov, A. E., Orlati, A., Rudnitskiy, A. G., ... Zhekanis, G. V. (2018). The high brightness temperature of B0529+483 revealed by RadioAstron and implications for interstellar scattering. Monthly Notices of the Royal Astronomical Society, 474(3), 3523-3534. https://doi.org/10.1093/mnras/stx2991

@article{12067690ca444402a0cbd4aa360cc611,

title = "The high brightness temperature of B0529+483 revealed by RadioAstron and implications for interstellar scattering",

abstract = "The high brightness temperatures, Tb ≳ 1013 K, detected in several active galactic nuclei by RadioAstron space VLBI observations challenge theoretical limits. Refractive scattering by the interstellar medium may affect such measurements. We quantify the scattering properties and the sub-mas scale source parameters for the quasar B0529+483. Using RadioAstron correlated flux density measurements at 1.7, 4.8, and 22 GHz on projected baselines up to 240 000 km we find two characteristic angular scales in the quasar core, about 100 and 10 μas. Some indications of scattering substructure are found. Very high brightness temperatures, Tb ≥ 1013 K, are estimated at 4.8 and 22 GHz even taking into account the refractive scattering. Our findings suggest a clear dominance of the particle energy density over the magnetic field energy density in the core of this quasar.",

keywords = "Galaxies: jets, Quasars: general, Quasars: individual (B0529+483), Radio continuum: galaxies, Scattering",

author = "Pilipenko, {S. V.} and Kovalev, {Y. Y.} and Andrianov, {A. S.} and U. Bach and S. Buttaccio and P. Cassaro and G. Cim{\`o} and Edwards, {P. G.} and Gawro{\'n}ski, {M. P.} and Gurvits, {L. I.} and T. Hovatta and Jauncey, {D. L.} and Johnson, {M. D.} and Kovalev, {Yu A.} and Kutkin, {A. M.} and Lisakov, {M. M.} and Melnikov, {A. E.} and A. Orlati and Rudnitskiy, {A. G.} and Sokolovsky, {K. V.} and C. Stanghellini and {de Vicente}, P. and Voitsik, {P. A.} and P. Wolak and Zhekanis, {G. V.}",

note = "Publisher Copyright: {\textcopyright} 2017 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society.",

year = "2018",

month = mar,

day = "1",

doi = "10.1093/mnras/stx2991",

language = "English",

volume = "474",

pages = "3523--3534",

journal = "Monthly Notices of the Royal Astronomical Society",

issn = "0035-8711",

publisher = "Oxford University Press ",

number = "3",

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Pilipenko, SV, Kovalev, YY, Andrianov, AS, Bach, U, Buttaccio, S, Cassaro, P, Cimò, G, Edwards, PG, Gawroński, MP, Gurvits, LI, Hovatta, T, Jauncey, DL, Johnson, MD, Kovalev, YA, Kutkin, AM, Lisakov, MM, Melnikov, AE, Orlati, A, Rudnitskiy, AG, Sokolovsky, KV, Stanghellini, C, de Vicente, P, Voitsik, PA, Wolak, P & Zhekanis, GV 2018, 'The high brightness temperature of B0529+483 revealed by RadioAstron and implications for interstellar scattering', Monthly Notices of the Royal Astronomical Society, vol. 474, no. 3, pp. 3523-3534. https://doi.org/10.1093/mnras/stx2991

TY - JOUR

T1 - The high brightness temperature of B0529+483 revealed by RadioAstron and implications for interstellar scattering

AU - Pilipenko, S. V.

AU - Kovalev, Y. Y.

AU - Andrianov, A. S.

AU - Bach, U.

AU - Buttaccio, S.

AU - Cassaro, P.

AU - Cimò, G.

AU - Edwards, P. G.

AU - Gawroński, M. P.

AU - Gurvits, L. I.

AU - Hovatta, T.

AU - Jauncey, D. L.

AU - Johnson, M. D.

AU - Kovalev, Yu A.

AU - Kutkin, A. M.

AU - Lisakov, M. M.

AU - Melnikov, A. E.

AU - Orlati, A.

AU - Rudnitskiy, A. G.

AU - Sokolovsky, K. V.

AU - Stanghellini, C.

AU - de Vicente, P.

AU - Voitsik, P. A.

AU - Wolak, P.

AU - Zhekanis, G. V.

PY - 2018/3/1

Y1 - 2018/3/1

N2 - The high brightness temperatures, Tb ≳ 1013 K, detected in several active galactic nuclei by RadioAstron space VLBI observations challenge theoretical limits. Refractive scattering by the interstellar medium may affect such measurements. We quantify the scattering properties and the sub-mas scale source parameters for the quasar B0529+483. Using RadioAstron correlated flux density measurements at 1.7, 4.8, and 22 GHz on projected baselines up to 240 000 km we find two characteristic angular scales in the quasar core, about 100 and 10 μas. Some indications of scattering substructure are found. Very high brightness temperatures, Tb ≥ 1013 K, are estimated at 4.8 and 22 GHz even taking into account the refractive scattering. Our findings suggest a clear dominance of the particle energy density over the magnetic field energy density in the core of this quasar.

AB - The high brightness temperatures, Tb ≳ 1013 K, detected in several active galactic nuclei by RadioAstron space VLBI observations challenge theoretical limits. Refractive scattering by the interstellar medium may affect such measurements. We quantify the scattering properties and the sub-mas scale source parameters for the quasar B0529+483. Using RadioAstron correlated flux density measurements at 1.7, 4.8, and 22 GHz on projected baselines up to 240 000 km we find two characteristic angular scales in the quasar core, about 100 and 10 μas. Some indications of scattering substructure are found. Very high brightness temperatures, Tb ≥ 1013 K, are estimated at 4.8 and 22 GHz even taking into account the refractive scattering. Our findings suggest a clear dominance of the particle energy density over the magnetic field energy density in the core of this quasar.

KW - Galaxies: jets

KW - Quasars: general

KW - Quasars: individual (B0529+483)

KW - Radio continuum: galaxies

KW - Scattering

UR - http://www.scopus.com/inward/record.url?scp=85040240019&partnerID=8YFLogxK

U2 - 10.1093/mnras/stx2991

DO - 10.1093/mnras/stx2991

M3 - Article

SN - 0035-8711

VL - 474

SP - 3523

EP - 3534

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

IS - 3

ER -

The high brightness temperature of B0529+483 revealed by RadioAstron and implications for interstellar scattering

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