Spectral optical monitoring of 3C390.3 in 1995-2007: I. Light curves and flux variation of the continuum and broad lines

Abstract

Here we present the results of the long-term (1995-2007) spectral monitoring of the broad line radio galaxy \object{3C~390.3}, a well known AGN with the double peaked broad emission lines, usually assumed to be emitted from an accretion disk. To explore dimensions and structure of the BLR, we analyze the light curves of the broad H$\alpha$ and H$\beta$ line fluxes and the continuum flux. In order to find changes in the BLR, we analyze the H$\alpha$ and H$\beta$ line profiles, as well as the change in the line profiles during the monitoring period. First we try to find a periodicity in the continuum and H$\beta$ light curves, finding that there is a good chance for quasi-periodical oscillations. Using the line shapes and their characteristics (as e.g. peaks separation and their intensity ratio, or FWHM) of broad H$\beta$ and H$\alpha$ lines, we discuss the structure of the BLR. Also, we cross-correlate the continuum flux with H$\beta$ and H$\alpha$ lines to find dimensions of the BLR. We found that during the monitoring period the broad emission component of the H$\alpha$ and H$\beta$ lines, and the continuum flux varied by a factor of $\approx$4-5. Also, we detected different structure in the line profiles of H$\alpha$ and H$\beta$. It seems that an additional central component is present and superposed to the disk emission. In the period of high activity (after 2002), H$\beta$ became broader than H$\alpha$ and red wing of H$\beta$ was higher than the one of H$\alpha$. We found time lags of $\sim$95 days between the continuum and H$\beta$ flux, and about 120 days between the continuum and H$\alpha$ flux. Variation in the line profiles, as well as correlation between the line and continuum flux during the monitoring period is in the favor of the disk origin of the broad lines with the possible contribution of some additional region and/or some kind of perturbation in the disk.

arXiv comment32 pages, accepted to A&A, typos corrected

References in corpus (25)

• Seyferts on the edge: polar scattering and orientation-dependent polarization in Seyfert 1 nuclei
• Periodic Oscillations in the Intra-day Optical Light Curves of the Blazar S5 0716+714
• Contribution of the Disk Emission to the Broad Emission Lines in AGNs: Two-component model
• Variability Timescales in the M87 Jet: Signatures of E-Squared Losses, Discovery of a Quasi-period in HST-1, and the Site of TeV Flaring
• Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XII. Ground-Based Monitoring of 3C 390.3
• Evidence for Binary Orbital Motion of a Quasar Broad-Line Region
• Long-Term Profile Variability of Double Peaked Emission Lines in Active Galactic Nuclei
• Equatorial scattering and the structure of the broad-line region in Seyfert nuclei: evidence for a rotating disc
• RE J1034+396: The origin of the soft X-ray excess and QPO
• X-ray and soft gamma-ray spectra of Broad-Line Radio Galaxies
• A ~4.6 h quasi-periodic oscillation in the BL Lacertae PKS 2155-304?
• The effect of cooling on time dependent behaviour of accretion flows around black holes
• Long-term variability of the optical spectra of NGC 4151: I. Light curves and flux correlations
• Profile variability of the H-alpha and H-beta broad emission lines in NGC5548
• Intermediate resolution H-beta spectroscopy and photometric monitoring of 3C 390.3 I. Further evidence of a nuclear accretion disk
• Observational evidence for the link between the variable optical continuum and the subparsec-scale jet of the radio galaxy 3C 390.3
• Contribution of a Disk Component to Single Peaked Broad Lines of Active Galactic Nuclei
• Relativistic plasma as the dominant source of the optical continuum emission in the broad-line radio galaxy 3C 120
• X-ray Observations of the Broad-Line Radio Galaxy 3C 390.3
• Wavelet analysis of a large sample of AGN at high radio frequencies
• Long-Term, Continuous Monitoring of the Broad Line Radio Galaxies 3C 390.3 and 3C 120 With the Rossi X-Ray Timing Explorer
• A Study of Time Variations of UV Continuum and Emission Lines in 3C390.3
• The Nature of the Broad--Line--Region in the Radio--Loud AGN 3C390.3
• Long term variability of the Broad Emission Line profiles in AGN
• Optical Monitoring of 3C 390.3 from 1995 to 2004 and Possible Periodicities in the Historical Light Curve

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