scholarly journals The gravitational microlens influence on X-ray spectral line generated by an AGN accretion disc

2001 ◽  
pp. 53-56 ◽  
Author(s):  
L.C. Popovic ◽  
E.G. Mediavilla ◽  
J.A. Munoz ◽  
M.S. Dimitrijevic ◽  
P. Jovanovic
Keyword(s):  
Spectral Line ◽  
Accretion Disc ◽  
Compact Objects ◽  
Host Galaxy ◽  
Line Profiles ◽  
Solar Mass ◽  
X Ray ◽  
Line Shapes ◽  
Ring Radius ◽  
Disc Model

The influence of gravitational microlensing on the X-ray spectral line profiles originated from a relativistic accretion disc has been studied. Using a disc model, we show that microlensing can induce noticeable changes in the line shapes when the Einstein ring radius associated with the microlens is of a size comparable to that of the accretion disc. Taking into account the relatively small size of the X-ray accretion disc, we found that compact objects (of about a Solar mass) which belong to the bulge of the host galaxy can produce significant changes in the X-ray line profile of AGN.

scholarly journals Measuring the supermassive black hole parameters with space missions

2006 ◽  
Vol 2 (S238) ◽  
pp. 475-476
Author(s):  
Alexander F. Zakharov
Keyword(s):  
Black Hole ◽  
Spectral Line ◽  
Accretion Disks ◽  
Seyfert Galaxies ◽  
Emission Lines ◽  
X Ray ◽  
Line Shapes ◽  
Supermassive Black Hole ◽  
Broad Emission ◽  
Different Types

AbstractRecent X-ray observations of microquasars and Seyfert galaxies reveal broad emission lines in their spectra, which can arise in the innermost parts of accretion disks. Recently Müller & Camenzind (2004) classified different types of spectral line shapes and described their origin. Zakharov (2006b) clarified their conclusions about an origin of doubled peaked and double horned line shapes in the framework of a radiating annulus model and discussed s possibility to evaluate black hole parameters analyzing spectral line shapes.

The impact theory of spectral line shapes: a paradigm shift

2013 ◽  
Vol 91 (11) ◽  
pp. 879-895 ◽  
Author(s):  
A.D. May ◽  
W.-K. Liu ◽  
F.R.W. McCourt ◽  
R. Ciuryło ◽  
J. Sanchez-Fortún Stoker ◽  
...  
Keyword(s):  
Spectral Line ◽  
Line Shape ◽  
Paradigm Shift ◽  
Wigner Distribution ◽  
Kinetic Equations ◽  
Line Profiles ◽  
Line Shapes ◽  
Experimental Line ◽  
Impact Theory ◽  
The Impact

An overview of the binary collision impact theory of spectral line shapes has been given to provide a unified statistical mechanical approach to line-shape theory, laser theory, nonlinear optics, and transport phenomena in dilute gases. The computation of spectral line profiles corresponding to those obtained from ultra-high-resolution spectral line-shape measurements requires numerical ab initio calculation of scattering amplitudes directly from the underlying dynamics of collisions between radiatively active molecules and their perturbers. The Wigner distribution function–density matrix is utilized to describe the kinetic theory of spectral line shapes and to discuss the various collisional processes that contribute to the kernel of kinetic equations. The influence of features of the potential energy surface on spectral parameters is also discussed, and the importance of comparing experimental line profiles directly with numerically computed line shapes obtained from reliable interaction potentials is emphasized. This contrasts sharply with the universal practice of comparing experimental line widths and shifts using some average or approximate theoretical scattering cross-sections and it contrasts sharply with fitting experimental profiles to some convenient analytical line-shape model; hence the phrase “a paradigm shift” in the title of this work.

Spectral line shapes of UM2- and AsK-edge resonant x-ray scattering in the two antiferromagnetic phases of UAs

2007 ◽  
Vol 75 (18) ◽  
Author(s):  
P. S. Normile ◽  
S. B. Wilkins ◽  
B. Detlefs ◽  
D. Mannix ◽  
E. Blackburn ◽  
...  
Keyword(s):  
Spectral Line ◽  
X Ray ◽  
Line Shapes ◽  
X Ray Scattering ◽  
Ray Scattering

Taking into account the effects of component proximity on the spectral-line profiles of stars in low-mass X-ray binary systems

2015 ◽  
Vol 59 (5) ◽  
pp. 346-359 ◽  
Author(s):  
V. S. Petrov ◽  
E. A. Antokhina ◽  
A. M. Cherepashchuk
Keyword(s):  
Spectral Line ◽  
Binary Systems ◽  
Line Profiles ◽  
X Ray ◽  
Low Mass

scholarly journals The influence of microlensing on spectral line shapes generated by a relativistic accretion disc

2001 ◽  
Vol 378 (1) ◽  
pp. 295-301 ◽  
Author(s):  
L. Č. Popović ◽  
E. G. Mediavilla ◽  
J. A. Muñoz
Keyword(s):  
Spectral Line ◽  
Accretion Disc ◽  
Line Shapes

scholarly journals Wide-Angle Quasar Feedback

2015 ◽  
Vol 11 (S319) ◽  
pp. 58-58
Author(s):  
George Chartas ◽  
Sarah Strickland
Keyword(s):  
Black Holes ◽  
Spectral Line ◽  
Absorption Line ◽  
Inclination Angle ◽  
Solid Angle ◽  
Host Galaxy ◽  
Wide Angle ◽  
X Ray ◽  
Spectral Line Profile ◽  
Excess Component

AbstractWe present results from the detection of relativistic winds launched near the innermost stable circular orbits of supermassive black holes. A recent detection of a powerful wind in the X-ray-bright narrow absorption line (NAL) z=1.51 quasar HS 0810+2554 strengthens the case that quasars play a significant role in feedback. In both deep Chandra and XMM-Newton observations of HS 0810 we detected blueshifted absorption lines implying outflowing velocities ranging from 0.1c and 0.4c. The presence of both an emission line at 6.8 keV and an absorption line at 7.8 keV in the spectral line profile of HS 0810 is a characteristic feature of a P-Cygni profile supporting the presence of an expanding outflowing highly ionized Fe absorber. A hard excess component is detected in the XMM-Newton observation of HS 0810 possibly originating from reflection off the disk. Modelling of the XMM-Newton spectrum constrains the inclination angle to be < 35° (68% confidence). The presence of relativistic winds in both low inclination angle NAL quasars as well as in high inclination angle BAL quasars implies that the solid angle of quasar winds may be quite large. The larger solid angle of quasar winds would also indicate that their contribution to the regulation of the host galaxy may be more important than previously thought.

Radial-velocity curves and theoretical spectral-line profiles of the components of low-mass close X-ray binary systems

2005 ◽  
Vol 49 (2) ◽  
pp. 109-126 ◽  
Author(s):  
E. A. Antokhina ◽  
A. M. Cherepashchuk ◽  
V. V. Shimanskii
Keyword(s):  
Spectral Line ◽  
Radial Velocity ◽  
Binary Systems ◽  
Line Profiles ◽  
X Ray ◽  
Low Mass

scholarly journals Iron line from neutron star accretion discs in scalar tensor theories

2020 ◽  
Vol 495 (1) ◽  
pp. L56-L60
Author(s):  
Niccolò Bucciantini ◽  
Jacopo Soldateschi
Keyword(s):  
Light Propagation ◽  
High Energy ◽  
Compact Objects ◽  
Alternative Theories Of Gravity ◽  
Iron Line ◽  
X Ray ◽  
Line Shapes ◽  
General Relativistic ◽  
Theories Of Gravity ◽  
Alternative Theories

ABSTRACT The Fe Kα fluorescent line at 6.4 keV is a powerful probe of the space–time metric in the vicinity of accreting compact objects. We investigated here how some alternative theories of gravity, namely scalar tensor theories, that invoke the presence of a non-minimally coupled scalar field and predict the existence of strongly scalarized neutron stars (NSs), change the expected line shape with respect to General Relativity. By taking into account both deviations from the general relativistic orbital dynamics of the accreting disc, where the Fe line originates, and the changes in the light propagation around the NS, we computed line shapes for various inclinations of the disc with respect to the observer. We found that both the intensity of the low-energy tails and the position of the high-energy edge of the line change. Moreover, we verified that even if those changes are in general of the order of a few percent, they are potentially observable with the next generation of X-ray satellites.

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