Reverberation Mapping of the BLRG 3C390.3

Astronomy and Astrophysics – Astronomy

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Scientific paper

Reverberation mapping of the broad line region (BLR) has become a standard tool in studying the size, structure, and mass of the central black hole of AGN. Recent work by Peterson et al. (2004)
and by Bentz et al. (2006) has
established a flatter radius luminosity relation for AGN as previously assumed. To provide improved measurements, i.e., smaller uncertainty of the BLR radius and hence the black hole mass of several AGN, we monitored the Broad-Line Radio Galaxy (BLRG) 3C390.3. From mid September until early December 2005 optical spectra were observed for 28 epochs, using the 2.4m Hiltner telescope at MDM Observatory. Simultaneously to the spectra g-band photometry data were obtained. During the monitoring campaign the g-band continuum of 3C390.3 varied with an amplitude of 10 %, as well as the AGN continuum F(5100). We measured emission line light curves for Halpha, Hbeta, Hgamma, HeI5876, and HeII4686. The delays and profile variations will be presented. The implications on the size and structure of the BLR and the mass of the central black hole will be discussed.

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