Other
Scientific paper
Apr 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..238..329b&link_type=abstract
Black Holes from Stars to Galaxies -- Across the Range of Masses. Edited by V. Karas and G. Matt. Proceedings of IAU Symposium #
Other
Scientific paper
The concept of disk geometry in the Broad Line Region (BLR) is very attractive as the most widely accepted model for Active Galactic Nuclei (AGN) includes a super massive black hole fed by an accretion disk. The detection and modelling of some double-peaked Balmer lines has supported this idea. However, the fraction of AGN that clearly shows double-peaked emission profiles is very small (around 5%) and statistically insignificant. On the other hand, the existence of the disk geometry in the BLR is not always followed with the emission of the double-peaked lines. One possible scenario is that the disk emission exists in spectral lines, but with the disk parameters (e.g. inclination) that can produce broad single-peaked lines, or there is a Keplerian disk with surrounding disk wind that also can produce broad single-peaked lines, which are normally seen in most of the AGN. In this work we study the possibility to have the disk emission in the BLR of an AGN with single-peaked Broad Emission Lines (BEL). First we will introduce the two-component model that is based on the assumption that the BLR is complex, i.e. that accretion disk is present in one part of the BLR, and that another part is a spherical region with the isotropic velocity distribution. Then we model the BEL with various contributions of both sub-regions, comparing it with observational line profiles for a number of AGN. According to our analysis we find that the accretion in the BLR can be present in the single-peaked BEL. We simulate and measure parameter k=W[1/10]/W[1/2] (the ratio of the full width at one tenth of the maximum and at half maximum) for different flux contributions of the disk and spherical region. The parameter k can be very useful for detection of the disk emission. Even if we have BEL with more prominent single-peak there is a possibility that the disk emission is present. Moreover, we find that the disk emission can be registered if the ratio of the disk flux and the flux from the spherical region is F[disk]/F[sph]>0.5, where inclination should be small (i<35°).
Bon Edi
Ilic Dragana
Popovic Luka C.
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