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27 April 2024 |
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Spectral optical monitoring of a double-peaked emission line AGN Arp 102B: I. Variability of spectral lines and continuum | | A. I. Shapovalova
; L. C. Popovic
; A. N. Burenkov
; V.H. Chavushyan
; D. Ilic
; W. Kollatschny
; A. Kovacevic
; N. G. Bochkarev
; J.R. Valdes
; J. Torrealba
; V. Patino-Alvarez
; J. Leon-Tavares
; E. Benitez
; L. Carrasco
; D. Dultzin
; A. Mercado
; V. E. Zhdanova
; | | Date: |
11 Aug 2013 | | Abstract: | Here we present results of the long-term (1987-2010) optical spectral
monitoring of the broad line radio galaxy Arp 102B, a prototype of active
galactic nuclei with the double-peaked broad emission lines, usually assumed to
be emitted from an accretion disk.
To explore the structure of the broad line region (BLR), we analyze the light
curves of the broad Halpha and Heta lines and the continuum flux. We aim to
estimate the dimensions of the broad-line emitting regions and the mass of the
central black hole.
We use the CCF to find lags between the lines and continuum variations. We
investigate in more details the correlation between line and continuum fluxes,
moreover we explore periodical variations of the red-to-blue line flux ratio
using Lomb-Scargle periodograms.
The line and continuum light curves show several flare-like events. The
fluxes in lines and in the continuum are not showing a big change (around 20%)
during the monitoring period. We found a small correlation between the line and
continuum flux variation, that may indicate that variation in lines has weak
connection with the variation of the central photoionization source. In spite
of a low line-continuum correlation, using several methods, we estimated a time
lag for Heta around 20 days. The correlation between the Heta and Halpha
flux variation is significantly higher than between lines and continuum. During
the monitoring period, the Heta and Halpha lines show double-peaked profiles
and we found an indication for a periodical oscillation in the red-to-blue flux
ratio of the Halpha line. The estimated mass of the central black hole is sim
1.1 imes 10^8 Modot that is in an agreement with the mass estimated from the
M-sigma* relation. | | Source: | arXiv, 1308.2407 | | Services: | Forum | Review | PDF | Favorites | |
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