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How frequent are close supermassive binary black holes in powerful jet sources?

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How frequent are close supermassive binary black holes in powerful jet sources? / Krause, Martin G. H.; Shabala, Stanislav S.; Hardcastle, Martin J.; Böhringer, Hans; Chon, Gayoung; Nawaz, Mohammad A.; Sarzi, Marc; Wagner, Alexander Y.

In: Monthly Notices of the Royal Astronomical Society, Vol. 482, No. 1, 01.01.2019, p. 240-261.

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Krause, Martin G. H. ; Shabala, Stanislav S. ; Hardcastle, Martin J. ; Böhringer, Hans ; Chon, Gayoung ; Nawaz, Mohammad A. ; Sarzi, Marc ; Wagner, Alexander Y. / How frequent are close supermassive binary black holes in powerful jet sources?. In: Monthly Notices of the Royal Astronomical Society. 2019 ; Vol. 482, No. 1. pp. 240-261.

Bibtex

@article{efb6a4dca8cc48448782cf9ea6ebc001,
title = "How frequent are close supermassive binary black holes in powerful jet sources?",
abstract = "Supermassive black hole binariesmay be detectable by an upcoming suite of gravitationalwave experiments. Their binary nature can also be revealed by radio jets via a short-period precession driven by the orbital motion as well as the geodetic precession at typically longer periods. We have investigated Karl G. Jansky Very Large Array and Multi-Element Radio Linked Interferometer Network (MERLIN) radio maps of powerful jet sources for morphological evidence of geodetic precession. For perhaps the best-studied source, Cygnus A, we find strong evidence for geodetic precession. Projection effects can enhance precession features, for which we find indications in strongly projected sources. For a complete sample of 33 3CR radio sources, we find strong evidence for jet precession in 24 cases (73 per cent). The morphology of the radio maps suggests that the precession periods are of the order of 10 6- 10 7 yr. We consider different explanations for the morphological features and conclude that geodetic precession is the best explanation. The frequently observed gradual jet angle changes in samples of powerful blazars can be explained by orbital motion. Both observations can be explained simultaneously by postulating that a high fraction of powerful radio sources have subparsec supermassive black hole binaries.We consider complementary evidence and discuss if any jetted supermassive black hole with some indication of precession could be detected as individual gravitational wave source in the near future. This appears unlikely, with the possible exception of M87. ",
keywords = "Black hole physics, Galaxies: jets, Gravitational waves, Radio continuum: galaxies",
author = "Krause, {Martin G. H.} and Shabala, {Stanislav S.} and Hardcastle, {Martin J.} and Hans B{\"o}hringer and Gayoung Chon and Nawaz, {Mohammad A.} and Marc Sarzi and Wagner, {Alexander Y.}",
note = "24 pages, 36 figures. {\textcopyright} 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)",
year = "2019",
month = jan,
day = "1",
doi = "10.1093/mnras/sty2558",
language = "English",
volume = "482",
pages = "240--261",
journal = "Monthly Notices of the Royal Astronomical Society",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "1",

}

RIS

TY - JOUR

T1 - How frequent are close supermassive binary black holes in powerful jet sources?

AU - Krause, Martin G. H.

AU - Shabala, Stanislav S.

AU - Hardcastle, Martin J.

AU - Böhringer, Hans

AU - Chon, Gayoung

AU - Nawaz, Mohammad A.

AU - Sarzi, Marc

AU - Wagner, Alexander Y.

N1 - 24 pages, 36 figures. © 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model)

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Supermassive black hole binariesmay be detectable by an upcoming suite of gravitationalwave experiments. Their binary nature can also be revealed by radio jets via a short-period precession driven by the orbital motion as well as the geodetic precession at typically longer periods. We have investigated Karl G. Jansky Very Large Array and Multi-Element Radio Linked Interferometer Network (MERLIN) radio maps of powerful jet sources for morphological evidence of geodetic precession. For perhaps the best-studied source, Cygnus A, we find strong evidence for geodetic precession. Projection effects can enhance precession features, for which we find indications in strongly projected sources. For a complete sample of 33 3CR radio sources, we find strong evidence for jet precession in 24 cases (73 per cent). The morphology of the radio maps suggests that the precession periods are of the order of 10 6- 10 7 yr. We consider different explanations for the morphological features and conclude that geodetic precession is the best explanation. The frequently observed gradual jet angle changes in samples of powerful blazars can be explained by orbital motion. Both observations can be explained simultaneously by postulating that a high fraction of powerful radio sources have subparsec supermassive black hole binaries.We consider complementary evidence and discuss if any jetted supermassive black hole with some indication of precession could be detected as individual gravitational wave source in the near future. This appears unlikely, with the possible exception of M87.

AB - Supermassive black hole binariesmay be detectable by an upcoming suite of gravitationalwave experiments. Their binary nature can also be revealed by radio jets via a short-period precession driven by the orbital motion as well as the geodetic precession at typically longer periods. We have investigated Karl G. Jansky Very Large Array and Multi-Element Radio Linked Interferometer Network (MERLIN) radio maps of powerful jet sources for morphological evidence of geodetic precession. For perhaps the best-studied source, Cygnus A, we find strong evidence for geodetic precession. Projection effects can enhance precession features, for which we find indications in strongly projected sources. For a complete sample of 33 3CR radio sources, we find strong evidence for jet precession in 24 cases (73 per cent). The morphology of the radio maps suggests that the precession periods are of the order of 10 6- 10 7 yr. We consider different explanations for the morphological features and conclude that geodetic precession is the best explanation. The frequently observed gradual jet angle changes in samples of powerful blazars can be explained by orbital motion. Both observations can be explained simultaneously by postulating that a high fraction of powerful radio sources have subparsec supermassive black hole binaries.We consider complementary evidence and discuss if any jetted supermassive black hole with some indication of precession could be detected as individual gravitational wave source in the near future. This appears unlikely, with the possible exception of M87.

KW - Black hole physics

KW - Galaxies: jets

KW - Gravitational waves

KW - Radio continuum: galaxies

UR - http://www.scopus.com/inward/record.url?scp=85057192337&partnerID=8YFLogxK

U2 - 10.1093/mnras/sty2558

DO - 10.1093/mnras/sty2558

M3 - Article

VL - 482

SP - 240

EP - 261

JO - Monthly Notices of the Royal Astronomical Society

JF - Monthly Notices of the Royal Astronomical Society

SN - 0035-8711

IS - 1

ER -