Spectral optical monitoring of a double-peaked emission line AGN Arp 102B Variability of spectral lines and continuum

: Shapovalova AI, Popovic LC, Burenkov AN, Chavushyan VH, Ilic D, Kollatschny W, Kovacevic A, Bochkarev NG, Valdes JR, Torrealba J, Patino-Alvarez V, Leon-Tavares J, Benitez E, Carrasco L, Dultzin D, Mercado A, Zhdanova VE

: 2013

Astronomy and Astrophysics

: ASTRONOMY & ASTROPHYSICS

: ASTRON ASTROPHYS

: ARTN A10

: 559

: 17

: 0004-6361

DOI: https://doi.org/10.1051/0004-6361/201321781

Results. The line and continuum light-curves show several flare-like events. The fluxes in lines and in the continuum show no significant change (around 20%) during the monitored period. We found a weak correlation between the line and continuum flux variation that may indicate that the line variation is weakly connected with the variation of the central photoionization source. In spite of this weak line-continuum correlation, we estimated a time lag for H beta of about 20 days using various methods. The correlation between the H beta and H alpha flux variation is significantly higher than that between the lines and continuum. During the monitored period, the H beta and H alpha lines show double-peaked profiles, and we found an indication for a periodical oscillation in the red-to-blue flux ratio of the H alpha line. The estimated mass of the central black hole is similar to 1.1 x 10(8) M-circle dot, which agrees with the mass estimated from the M-sigma-* relation.