Oblique magnetic fields and the role of frame dragging

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F19%3A00518069" target="_blank" >RIV/67985815:_____/19:00518069 - isvavai.cz</a>

Result on the web

<a href="http://hdl.handle.net/11104/0303260" target="_blank" >http://hdl.handle.net/11104/0303260</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1002/asna.201913569" target="_blank" >10.1002/asna.201913569</a>

Result language

angličtina

Original language name

Oblique magnetic fields and the role of frame dragging

Original language description

Magnetic null points can develop near the ergosphere boundary of a rotating black hole through the combined effects of strong gravitational field and the frame-dragging mechanism. The electric component does not vanish in the magnetic null, and an efficient process or particle acceleration can occur. The situation is relevant to starving (low-accretion-rate, such as the Milky Way's supermassive black hole [SMBH]) nuclei of some galaxies that exhibit only episodic accretion events. The presence of the magnetic field of external origin is an important aspect. We propose that such conditions can develop when a magnetized neutron star approaches the SMBH during late stages of its inspiral motion. The field lines of the neutron star dipole thread the black hole's event horizon and rapidly change their connectivity. We compare the case of a dipole-type magnetic field of a sinking and orbiting star near a nonrotating black hole and the near-horizon structure of an asymptotically uniform magnetic field of a distant source near a fast-rotating black hole. Although the two cases are qualitatively different from each other, they both develop magnetically neutral null points near the event horizon.

Czech name

—

Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

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Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Astronomische Nachrichten

ISSN

1521-3994

e-ISSN

—

Volume of the periodical

340

Issue of the periodical within the volume

1-3

Country of publishing house

DE - GERMANY

Number of pages

5

Pages from-to

100-104

UT code for WoS article

000468591100019

EID of the result in the Scopus database

2-s2.0-85063473075