Počet záznamů: 1  

Plunging neutron stars as origin of organised magnetic field in galactic nuclei

  1. 1. 0484602 - ASU-R 2018 RIV SK eng J - Článek v odborném periodiku
    Karas, Vladimír - Kopáček, Ondřej - Kunneriath, D. - Zajaček, M. - Araudo, Anabella - Eckart, A. - Kovář, J.
    Plunging neutron stars as origin of organised magnetic field in galactic nuclei.
    Contributions of the Astronomical Observatory Skalnaté Pleso. Roč. 47, č. 2 (2017), s. 124-132. ISSN 1335-1842
    Grant CEP: GA ČR GA17-16287S; GA MŠk LD15061
    Grant ostatní:COST(XE) MP1304
    Institucionální podpora: RVO:67985815
    Klíčová slova: magnetic fields * neutron stars * galactic centre
    Kód oboru RIV: BN - Astronomie a nebeská mechanika, astrofyzika
    Obor OECD: Astronomy (including astrophysics,space science)
    Impakt faktor: 0.733, rok: 2017

    Black holes cannot support their own internal magnetic field like, for example, compact stars can. Despite this fact observations indicate that event horizons of supermassive black holes (SMBH) are threaded by field lines along which plasma streams flow. Various magnetohydrodynamical mechanisms have been suggested to generate turbulent magnetic fields on small scales, however, the origin of the large-scale component is unclear. In this write-up we describe our progress in an on-going work and discuss the possibility of dipole-type magnetic fields being brought onto SMBH by magnetised neutron stars, which are expected to drift inward from a hidden population in the Nuclear Star Cluster. This can contribute to an organised component of the magnetic field on the characteristic length-scale of the stellar size, which thread the horizon during the final stages of the magnetized star plunge into or its close flyby around SMBH. Because of mass size scaling relations for black holes, the effect is more important for lower-mass SMBH.
    Trvalý link: http://hdl.handle.net/11104/0279767