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  Blocking low-eccentricity EMRIs: A statistical direct-summation N-body study of the Schwarzschild barrier

Brem, P., Amaro-Seoane, P., & Sopuerta, C. F. (2014). Blocking low-eccentricity EMRIs: A statistical direct-summation N-body study of the Schwarzschild barrier. Monthly Notices of the Royal Astronomical Society, 437(2), 1259-1267. doi:10.1093/mnras/stt1948.

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Datensatz-Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-803D-B Versions-Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-803E-9
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 Urheber:
Brem, Patrick, Autor
Amaro-Seoane, Pau1, Autor              
Sopuerta, Carlos F., Autor
Affiliations:
1Astrophysical and Cosmological Relativity, AEI-Golm, MPI for Gravitational Physics, Max Planck Society, escidoc:1933290              

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Schlagwörter: Astrophysics, Cosmology and Extragalactic Astrophysics, astro-ph.CO,General Relativity and Quantum Cosmology, gr-qc
 Zusammenfassung: The capture of a compact object in a galactic nucleus by a massive black hole (MBH), an extreme-mass ratio inspiral (EMRI), is the best way to map space and time around it. Recent work on stellar dynamics has demonstrated that there seems to be a complot in phase space acting on low-eccentricity captures, since their rates decrease significantly by the presence of a blockade in the rate at which orbital angular momenta change takes place. This so-called "Schwarzschild barrier" is a result of the impact of relativistic precession on to the stellar potential torques, and thus it affects the enhancement on lower-eccentricity EMRIs that one would expect from resonant relaxation. We confirm and quantify the existence of this barrier using a statistical sample of 2,500 direct-summation N-body simulations using both a post-Newtonian and also for the first time in a direct-summation code a geodesic approximation for the relativistic orbits. The existence of the barrier prevents low-eccentricity EMRIs from approaching the central MBH, but high-eccentricity EMRIs, which have been wrongly classified as "direct plunges" until recently, ignore the presence of the barrier, because they are driven by two-body relaxation. Hence, since the rates are significantly affected in the case of low-eccentricity EMRIs, we predict that a LISA-like observatory such as eLISA will predominantly detect high-eccentricity EMRIs.

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 Datum: 2012-11-232014
 Publikationsstatus: Im Druck publiziert
 Seiten: 10 pages, submitted
 Ort, Verlag, Ausgabe: -
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 Identifikatoren: arXiv: 1211.5601
DOI: 10.1093/mnras/stt1948
URI: http://arxiv.org/abs/1211.5601
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Titel: Monthly Notices of the Royal Astronomical Society
  Andere : Mon. Not. R. Astron. Soc.
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Oxford : Oxford University Press
Seiten: - Band / Heft: 437 (2) Artikelnummer: - Start- / Endseite: 1259 - 1267 Identifikator: ISSN: 1365-8711
CoNE: http://pubman.mpdl.mpg.de/cone/journals/resource/1000000000024150