Facultad de Ciencias
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Examinando Facultad de Ciencias por Materia "Astrofotometría"
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Publicación AGN variability observed with the VYSOS6 telescope on Cerro Armazones(2012) Pozo-Núñez, Francisco; Chini, Rolf; Universidad Católica del NorteIn this thesis I present new monitoring results of three local active galactic nuclei (AGNs), 3C120, Ark120 and PG0003+199 observed with the robotic 15cm telescope VYSOS6 on Cerro Murphy, Chile. Broad line region (BLR) sizes, Black hole masses (BH) and the galaxy host subtracted luminosities were determined with photometric reverberation mapping and applying the Flux Variation Gradient (FVG) method. While spectroscopic reverberation mapping is a expensive technique, the aim of the presented study is to establish a more efficient photometric reverberation mapping method and to compare the results with those obtained using the spectroscopic reverberation data available. Observations in broad (B,V) and narrow band (SII,OIII ) filters were performed in order to measure the variations in the continuum and the time lag (echo) of the BLR emission lines respectively. For 3C120 and Ark120 the narrow band is constituted by about 50% continuum emission and 50% H line emission. To obtain the time lag of only the emission line, I create a synthetic H light curve by subtracting a scaled V-band light curve from the narrow-band light curve. For PG0003+199 the narrow band contains about 85% of the H emission line, and thus the time lag can be obtained without subtracting the continuum contribution. The median sampling of 2 days enabled us to achieve exceptionally small errors of about 10% in the lags obtained from the cross correlation of the light curves. Virial black hole mass calculations are consistent with previous results in the literature. The host-subtracted rest-frame 5100°A luminosity was determined with an uncertainty of about 10%. These results allow us to re-examine and improve the RBLR-L relationship.