The Broad-Line Region of NGC 4151: its Structure and Physical Characteristics

Details The Broad-Line Region of NGC 4151: its Structure and Physical Characteristics The Broad-Line Region of NGC 4151: its Structure and Physical Characteristics

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007jena.confr..55m&link_type=abstract

"JENAM-2007, "Our non-stable Universe", held 20-25 August 2007 in Yerevan, Armenia. Abstract book, p. 55-55"

Physics

Scientific paper

The optical spectral variability of NGC 4151 is modeled on the basis of the observational data by Kaspi et al. (1996) and the theoretical model of the broad-line region by Shevchenko (1984, 1985). One of the purposes of the modelling consists in interpretation of the difference in time lags of the observed variations in the H-alpha line (Lyutyi and Cherepashchuk 1971, Cherepashchuk and Lyutyi 1973) and the Hβ line (Antonucci and Cohen 1983) with respect to the observed variations in continuum. In agreement with conclusions by Shevchenko (1984, 1985), it is found that the difference is explained by strong nonlinearity of the dependence of the luminosity of a typical BLR cloud in the H-alpha line upon the value of the flux of ionizing continuum at the cloud. This nonlinearity is taken into account in numerical modeling of an AGN emission-line lightcurve for the first time. The values of parameters of the NGC 4151 BLR model are retrieved, that allow to judge on the structure and physical characteristics of the near-nuclear region. In particular, new estimates of the geometrical size of the BLR have been made, independent of the choice of the emission line in the lightcurve analysis.

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