Publications (13)
First long-term optical spectro-photometric monitoring of a binary black hole candidate E1821+643: I. Variability of spectral lines and continuum
A. I. Shapovalova, L. C. Popovic, V. H. Chavushyan +9
We report the results of the first long-term (1990-2014) optical spectro-photometric monitoring of a binary black hole candidate QSO E1821+643, a low-redshift high-luminosity radio…
Radio-Optical-Gamma-Ray properties of MOJAVE AGN detected by Fermi/LAT
T. G. Arshakian, J. León-Tavares, M. Boettcher +5
Aims. We use a sample of 83 core-dominated active galactic nuclei (AGN) selected from the MOJAVE (Monitoring of Jets in AGN with VLBA Experiments) radio-flux-limited sample and det…
Witnessing the transformation of a quasar host galaxy at z=1.6
A. Humphrey, N. Roche, J. M. Gomes +9
A significant minority of high redshift radio galaxy (HzRG) candidates show extremely red broad band colours and remain undetected in emission lines after optical `discovery' spect…
Baldwin Effect and Additional BLR Component in AGN with Superluminal Jets
V. M. Patiño-Ãvarez, J. Torrealba, V. Chavushyan +4
We study the Baldwin Effect (BE) in 96 core-jet blazars with optical and ultraviolet spectroscopic data from a radio-loud AGN sample obtained from the MOJAVE 2 cm survey. A statist…
Optical Photometric and Spectroscopic study of the Seyfert Galaxy SBS 0748+499
J. Torrealba, E. Benitez, A. Franco-Balderas +1
We present the first optical photometric study of the active galaxy SBS 0748+499. First, we present B, V, R and I photometric data: total magnitudes and B-V, B-R, B-I colors; surfa…
Radio-optical scrutiny of compact AGN: Correlations between properties of pc-scale jets and optical nuclear emission
T. G. Arshakian, J. Torrealba, V. H. Chavushyan +4
We study the correlations between the Very Long Baseline Array radio emission at 15 GHz, extended emission at 151 MHz, and optical nuclear emission at 5100 AA for a complete sample…
Spectroscopic monitoring of the Blazar 3C 454.3
E. Benitez, V. H. Chavushyan, C. M. Raiteri +5
We performed an optical spectroscopic monitoring of the blazar 3C 454.3 from September 2003 to July 2008. Sixteen optical spectra were obtained during different runs, which constit…
Multi-band properties of superluminal AGN detected by Fermi/LAT
T. G. Arshakian, J. León-Tavares, J. Torrealba +1
We perform a multi-band statistical analysis of core-dominated superluminal active galactic nuclei (AGN) detected with Fermi Large Area Telescope (LAT). The detection rate of -…
Spectral Optical Monitoring of the Narrow Line Seyfert 1 galaxy Ark 564
A. I. Shapovalova, L. C. Popovic, A. N. Burenkov +14
We present the results of a long-term (1999--2010) spectral optical monitoring campaign of the active galactic nucleus (AGN) Ark 564, which shows a strong Fe II line emission in th…
Spectral optical monitoring of the double peaked emission line AGN Arp 102B: II. Variability of the broad line properties
L. C. Popovic, A. I. Shapovalova, D. Ilic +9
We investigate a long-term (26 years, from 1987 to 2013) variability in the broad spectral line properties of the radio galaxy Arp 102B, an active galaxy with broad double-peaked e…
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 +14
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-peak…
Optical Spectroscopic Observations of Gamma-ray Blazar Candidates. V. TNG, KPNO, and OAN Observations of Blazar Candidates of Uncertain Type in the Northern Hemisphere
N. Ãlvarez Crespo, N. Masetti, F. Ricci +12
The extragalactic -ray sky is dominated by emission from blazars, a peculiar class of active galactic nuclei (AGNs). Many of the -ray sources included in Fermi -Large Area…
Optical Spectrophotometric Monitoring of Fermi/LAT Bright Sources
V. Patiño-Ãlvarez, V. Chavushyan, J. León-Tavares +4
We describe an ongoing optical spectrophotometric monitoring program of a sample of Fermi/LAT bright sources showing prominent and variable γ-ray emission, with the 2.1m telescope…