Signatures of highly inclined accretion disks in Galactic Black Hole Candidates and AGNs

Abstract

Recent X-ray observations of Galactic Black Hole Candidates and AGNs and Seyfert galaxies reveal the broad emission lines in their spectra, which can arise in the innermost parts of accretion disks. Simulation indicates that at low inclination angle the line is registered by distant observer with characteristic 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 such effect. They assumed that the effect is applicable to a Kerr metric far beyond of a range of parameters that they exploited. We check and confirm their hypothesis about such structure of the spectral line shape for a Kerr metric case. We use no astrophysical assumptions about physical structure of the emission region except assumption that the region should be narrow enough. Positions and heights of these extra peaks drastically depends on both the radial coordinate of the emitting region (circular hot spot) and the inclination angle. We find that best conditions to observe this effect are realized at $θ> 85\degr$ and $r>5r_g$ and may exist in microquasars or low-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, for example, SS433 binary system). The line profiles for different inclination angles and radial coordinates are presented. To analyze an influence of disk models on the spectral line shapes we simulate the line profiles for Shakura -- Sunyaev disk model for accretion disks with the high inclination.

arXiv comment8 pages; 3 figures, Accepted for publication in Astronomy & Astrophysics

References in corpus (20)

• ASCA observations of Seyfert 1 galaxies: II. Relativistic Iron K-alpha emission
• Broad iron lines in Active Galactic Nuclei
• Evidence for Spin and Energy Extraction in a Galactic Black Hole Candidate: The XMM-Newton/EPIC-pn Spectrum of XTE J1650-500
• Physical Diagnostics from a Narrow Fe-Kalpha Emission Line Detected by Chandra in the Seyfert 1 Galaxy NGC 5548
• Evidence for Frame-Dragging Around Spinning Black Holes in X-Ray Binaries
• Chandra Observations of the X-ray Narrow-Line Region in NGC 4151
• Line Emission from an Accretion Disk around a Rotating Black Hole: Toward a Measurement of Frame Dragging
• Effects of Kerr Spacetime on Spectral Features from X-Ray Illuminated Accretion Discs
• Evidence for a relativistic iron line in GRS 1915+105
• Quasi-regular X-ray bursts from GRS 1915+105 observed with the IXAE: possible evidence for matter disappearing into the event horizon of the black hole
• On the origin of the broad, relativistic iron line of MCG-6-30-15 observed by XMM-Newton
• On the Origin of Broad Fe K alpha and Hi H alpha Lines in AGN
• Line Emission from an Accretion Disk around a Black hole: Effects of Disk Structure
• X-ray iron line variability for the model of an orbiting flare above a black hole accretion disc
• Detecting Compton Reflection and a Broad Iron Line in MCG-5-23-16 with the Rossi X-ray Timing Explorer
• Disk Models for MCG-06-30-15: The Variability Challenge
• A Simple New Method For Analysing Gapped Time-Series: Search For a High Frequency Cut-off In The X-ray Power Spectrum of MCG -6-30-15
• Estimation of relativistic accretion disk parameters from iron line emission
• Non-Steady State Accretion Disks in X-Ray Novae: Outburst Models for Nova Monocerotis 1975 and Nova Muscae 1991
• Line emission from an accretion disk around black hole: effects of the disk structure

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• On variability and spectral distortion of the fluorescent iron lines from black-hole accretion discs
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