Magnetic fields of AGNs and standard accretion disk model: testing by optical polarimetry

Силантьев, Н. А.; Piotrovich, M. Yu.; Gnedin, Yu. N.; Natsvlishvili, T. M.

doi:10.1051/0004-6361/200810892

Cited by 50 publications

(40 citation statements)

References 58 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The dependence of the degree of polarization on the spin of the central black hole is studied in Silant'ev et al (2013b). The approximate analytical expressions for the polarization of the radiation from a magnetized disk around black hole can be found in Silant'ev (2002Silant'ev ( , 2005, Silant'ev et al (2009).…”

Section: Amplification Of Brightness Of the Image Sourcementioning

confidence: 99%

Gravitational lensing by a rotating massive object in a plasma

Morozova

Ahmedov

Tursunov

2013

Astrophys Space Sci

109

View full text Add to dashboard Cite

We study gravitational lensing in the vicinity of a slowly rotating massive object surrounded by a plasma. We have studied two effects: (i) the influence of the frame dragging on the deflection angle of the light ray in the presence of plasma (ii) Faraday rotation of the polarization plane of the light. We derive the expression for the lensing angle in a non-diagonal space-time in the weak field regime in the presence of plasma and discuss it for the spacetime metric of the slowly rotating object. The obtained deflection angle depends on (i) the frequency of the electromagnetic wave, due to the dispersion properties of the plasma; (ii) the gravitational mass M; and (iii) the angular momentum J of the gravitational lens. We studied the influence of rotation of the gravitational lens on the magnification of brightness of the source star in the case of microlensing and have shown that it is negligibly small. For the completeness of our study the effect of the Faraday rotation of the polarization plane is considered.

show abstract

Section: Amplification Of Brightness Of the Image Sourcementioning

confidence: 99%

Gravitational lensing by a rotating massive object in a plasma

Morozova

Ahmedov

Tursunov

2013

Astrophys Space Sci

109

View full text Add to dashboard Cite

show abstract

“…To confirm this, we derive equations for the degree p of polarization and position angle χ of optical radiation emerging from the surface of a magnetized accretion disk [34]. Since accretion disks are observed as a whole, we have to use expressions that are averaged over the local azimuthal angle:…”

Section: Mechanisms For Large-scale Rotation Of the Mean Position Anglementioning

confidence: 99%

“…An example of these effects is the solution of the traditional Milne problem for the case of a magnetized atmosphere in which the magnetic field is directed along the surface normal [32][33][34].…”

mentioning

confidence: 99%

Polarimetric consequences of large-scale structure in the distribution of galaxies and quasars

et al. 2010

Self Cite

View full text Add to dashboard Cite

The problem of inhomogeneities in the distribution of galaxies and quasars over cosmological distances (cell structure) has been discussed in many papers. Here, in particular, we wish to draw attention to the polarimetric consequences of this structure. We discuss in detail the possibility of a large-scale rotation of the mean position angle of the observed polarization over the scale of the cellular structure. We mainly consider rotation mechanisms associated with polarized radiation from magnetized accretion disks near quasars and black holes. In that case the possible correlation of magnetic fields on cosmological scales will show up as a rotation of the mean position angle ranging from 0 to 45 degrees. Correlations in nonspherical formations of galaxies and quasars over cosmological distances also lead to rotation in the mean position angle over these distances. In principle, these two rotation mechanisms can, together, produce an arbitrary rotation of the mean position angle over distances corresponding to the inhomogeneous structure in the distribution of galaxies and quasars.

show abstract

“…The magnetic coupling process is an effective mechanism for transferring energy and angular momentum from a rotating black hole to its surrounding accretion disk (Zhang, Lu & Zhang 2005). Since the magnetic field on the horizon is brought and held by accretion disk matter, some relation must exist between the magnetic field strength and the BH mass and the bolometric luminosity (Silant'ev et al 2009):…”

Section: The Study Of Qso Magnetic Fieldsmentioning

confidence: 99%

“…The magnetic field strengths and their topology in an accretion disk around the supermassive black hole can be determined by the UV polarimetric observations with use of Silant'ev and Gnedin method based onto the account of the Faraday rotation effect on the photon mean free path in the electron scattering process (Gnedin & Silant'ev 1997;Silant'ev et al 2009). …”

Section: The Study Of Qso Magnetic Fieldsmentioning

confidence: 99%

Polarization of AGN in UV spectral range

Gnedin¹,

Piotrovich²,

Natsvlishvili³

2011

UV Astronomy 2011

Self Cite

View full text Add to dashboard Cite

We present the review of some new problems in cosmology and physics of stars in connection with future launching of WSO. We discuss three problems. UV observations of distant z > 6 quasars allow to obtain information on the soft < 1KeV X-ray radiation of the accretion disk around a supermassive black hole because of its cosmological redshift. Really the region of X-ray radiation is insufficiently investigated because of high galactic absorption. In a result one will get important information on the reionization zone of the Universe. Astronomers from ESO revealed the effect of alignment of electric vectors of polarized QSOs. One of the probable mechanism of such alignment is the conversion of QSO radiation into low mass pseudoscalar particles (axions) in the extragalactic magnetic field. These boson like particles have been predicted by new SUSY particle physics theory. Since the probability of such conversion is increasing namely in UV spectral range one can expect the strong correlation between UV spectral energy distribution of QSO radiation and polarimetric data in the optical range. In the stellar physics one of the interesting problems is the origin of the X-ray sources with super Eddington luminosities. The results of UV observations of these X-ray sources will allow to find the origin of these sources as accreting intermediate mass black holes.

show abstract

Magnetic fields of AGNs and standard accretion disk model: testing by optical polarimetry

Cited by 50 publications

References 58 publications

Gravitational lensing by a rotating massive object in a plasma

Gravitational lensing by a rotating massive object in a plasma

Polarimetric consequences of large-scale structure in the distribution of galaxies and quasars

Polarization of AGN in UV spectral range

Contact Info

Product

Resources

About