English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Recent X-ray observations of Galactic Black Hole Candidates and AGNs andSeyfert galaxies reveal the broad emission lines in their spectra, which canarise in the innermost parts of accretion disks. Simulation indicates that atlow inclination angle the line is registered by distant observer withcharacteristic two-peak profile. However, at high inclination angles ($> 85\degr$) two additional peaks arise. This phenomenon was discovered by Matt,Perola, Stella (1993) using the Schwarzschild black hole metric to analyze sucheffect. They assumed that the effect is applicable to a Kerr metric far beyondof a range of parameters that they exploited. We check and confirm theirhypothesis about such structure of the spectral line shape for a Kerr metriccase. We use no astrophysical assumptions about physical structure of theemission region except assumption that the region should be narrow enough.  Positions and heights of these extra peaks drastically depends on both theradial coordinate of the emitting region (circular hot spot) and theinclination angle. We find that best conditions to observe this effect arerealized at $\theta > 85\degr$ and $r > 5r_g$ and may exist in microquasars orlow-mass black holes in X-ray binary systems, because there is some precession(and nutation of accretion disks) with not very long time periods (see, forexample, SS433 binary system). The line profiles for different inclinationangles and radial coordinates are presented. To analyze an influence of diskmodels on the spectral line shapes we simulate the line profiles for Shakura --Sunyaev disk model for accretion disks with the high inclination.Comment: 8 pages; 3 figures, Accepted for publication in Astronomy &  Astrophysic

Signatures of highly inclined accretion disks in galactic black hole candidates and AGNs