A Galactic centre gravitational-wave Messenger
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47813059%3A19630%2F20%3AA0000028" target="_blank" >RIV/47813059:19630/20:A0000028 - isvavai.cz</a>
Result on the web
<a href="https://www.nature.com/articles/s41598-020-63206-1" target="_blank" >https://www.nature.com/articles/s41598-020-63206-1</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1038/s41598-020-63206-1" target="_blank" >10.1038/s41598-020-63206-1</a>
Alternative languages
Result language
angličtina
Original language name
A Galactic centre gravitational-wave Messenger
Original language description
Our existence in the Universe resulted from a rare combination of circumstances. The same must hold for any highly developed extraterrestrial civilisation, and if they have ever existed in the Milky Way, they would likely be scattered over large distances in space and time. However, all technologically advanced species must be aware of the unique property of the galactic centre: it hosts Sagittarius A* (Sgr A*), the closest supermassive black hole to anyone in the Galaxy. A civilisation with sufficient technical know-how may have placed material in orbit around Sgr A* for research, energy extraction, and communication purposes. In either case, its orbital motion will necessarily be a source of gravitational waves. We show that a Jupiter-mass probe on the retrograde innermost stable circular orbit around Sgr A* emits, depending on the black hole spin, at a frequency of f(GW)=0.63-1.07 mHz and with a power of P-GW=2.7x10(36)-2.0x10(37)erg/s. We discuss that the energy output of a single star is sufficient to stabilise the location of an orbiting probe for a billion years against gravitational wave induced orbital decay. Placing and sustaining a device near Sgr A* is therefore astrophysically possible. Such a probe will emit an unambiguously artificial continuous gravitational wave signal that is observable with LISA-type detectors.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences
Result continuities
Project
<a href="/en/project/GA17-16287S" target="_blank" >GA17-16287S: Oscillations and coherent features in accretion disks around compact objects and their observational signatures</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2020
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
SCIENTIFIC REPORTS
ISSN
2045-2322
e-ISSN
—
Volume of the periodical
10
Issue of the periodical within the volume
1
Country of publishing house
GB - UNITED KINGDOM
Number of pages
6
Pages from-to
„7054-1“-„7054-6“
UT code for WoS article
000530731300028
EID of the result in the Scopus database
2-s2.0-85084005238