Query : 2001A&A...378..295P

2001A&A...378..295P - Astronomy and Astrophysics, volume 378, 295-301 (2001/10-4)

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


Abstract (from CDS):

We study the influence of gravitational microlensing on the spectral line profiles originating from a relativistic accretion disc. Using the Chen & Halpern (1989ApJ...344..115C) model for the disc, we show the noticeable changes that microlensing can induce in the line shape when the Einstein radius associated with the microlens is of a size comparable to that of the accretion disc. Of special interest is the relative enhancement between the blue and red peaks of the line when an off-center microlens affects the approaching and receding parts of the accretion disc asymmetrically. In an AGN formed by a super-massive binary in which the accretion disc is located around one of the super-massive companions (the primary), we discuss the possibility of microlensing by the secondary. In this case the ratio between the blue and red peaks of the line profile would depend on the orbital phase. We have also considered the more standard configuration of microlensing by a star-sized object in an intervening galaxy and find that microlensing may also be detected in the broad emission lines of multiply imaged QSOs. The changes observed in the line profile of Arp 102B are taken as a reference for exploring both scenarios.

Abstract Copyright:

Journal keyword(s): accretion - accretion disks - line: formation - relativity - gravitational lensing

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 MCG+08-31-041 Sy1 17 19 14.4925971408 +48 58 49.423205136   15.86 14.81 9.44   ~ 294 1
2 ICRF J184208.9+794617 Sy1 18 42 08.9904975672 +79 46 17.127835104   16.06 15.38     ~ 1261 0

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