201 citations · 2k across the 75 of their papers we have counts for
23 papers · 1 filter
Jet-BLR connection in the radio galaxy 3C 390.3
T. G. Arshakian, J. Leon-Tavares, A. P. Lobanov +5
Variations of the optical continuum emission in the radio galaxy 3C 390.3 are compared to the properties of radio emission from the compact, sub-parsec-scale jet in this object. We…
Long-term variability of the optical spectra of NGC 4151: I. Light curves and flux correlations
A. I. Shapovalova, L. C. Popovic, S. Collin +13
Results of a long-term spectral monitoring of the active galactic nucleus of NGC 4151 are presented (11 years, from 1996 to 2006). High quality spectra (S/N>50 in the continuum nea…
Radio-Optical Study of Double-Peaked AGNs. I. 3C 390.3
J. Leon-Tavares, A. P. Lobanov, V. H. Chavushyan +1
We aim to test the model proposed to explain the correlation between the flux density at 15 GHz of a stationary component in the parsec-scale jet and the optical continuum emission…
Complex emission line region of Mrk 817
D. Ilic, L. C. Popovic, E. Bon +2
In this work we study the physical and kinematical properties of the emission line region of Seyfert 1.5 galaxy Mrk 817 using three sets of observations, among which are high-resol…
A 3-Dimensional study of the Local Environment of Bright IRAS Galaxies: The AGN/Starburst connection
Elias Koulouridis, Vahram Chavushyan, Manolis Plionis +2
We present a 3-dimensional study of the local ( kpc) and the large scale ( 1 Mpc) environment of Bright IRAS Galaxies (BIRGs). For this purpose we u…
The source of variable optical emission is localized in the jet of the radio galaxy 3C 390.3
Tigran G. Arshakian, Andrei P. Lobanov, Vahram H. Chavushyan +2
We present observational evidence for the link between variability of the radio emission of the relativistic jet and optical continuum emission in the radio galaxy 3C 390.3 which i…
Mining for normal galaxies in the First XMM-Newton Serendipitous Source Catalog
A Georgakakis, V. Chavushyan, M. Plionis +4
This paper uses the 1st XMM Serendipitous Source Catalog compiled by the XMM Science Center to identify low-z X-ray selected normal galaxy candidates. Our sample covers a total are…
Observational evidence for the link between the variable optical continuum and the jet of a radio-loud galaxy 3C 390.3
Tigran G. Arshakian, Andrei P. Lobanov, Vahram H. Chavushyan +2
The ``central engine'' of AGN is thought to be powered by accretion on a central nucleus believed to be a super-massive black hole. The localization and exact mechanism of the ener…
Probing the physical properties of the NGC 5548 Broad Line Region using Balmer lines
L. C. Popovic, A. I. Shapovalova, V. H. Chavushyan +4
We investigate the physical characteristics of the Broad Line Region (BLR) of NGC 5548 using the Boltzmann plot (BP) method, that we applied on the Balmer lines observed from 1996…
Optically bright Active Galactic Nuclei in the ROSAT-Faint Source Catalogue
M. -P. Veron-Cetty, S. K. Balayan, A. M. Mickaelian +8
To build a large, optically bright, X-ray selected AGN sample we have correlated the ROSAT-FSC catalogue of X-ray sources with the USNO catalogue limited to objects brighter than O…
A Multiwavelength study of NLS1s galaxies from the Second Byurakan Survey
J. A. Stepanian, E. Benitez, Y. Krongold +6
In this work we present a multiwavelength study of narrow-line Seyfert 1 galaxies (NLS1s) discovered in the Second Byurakan Survey (SBS). The sample consists of 26 objects, which h…
Radio and Optical Spectra of Objects from Two Complete Samples of Radio Sources
V. Chavushyan, R. Mujica, A. G. Gorshkov +3
We present optical identifications and radio spectra for ten radio sources from two flux-density-complete samples. Radio variability characteristics are presented for four objects.…
Optical Spectra of Four Objects Identified with Variable Radio Sources
V. Chavushyan, R. Mujica, A. G. Gorshkov +2
We obtained optical spectra of four objects identified with variable radio sources. Three objects (0029+0554, 0400+0550, 2245+0500) were found to be quasars with redshifts of 1.314…
The Leo I Cloud: Secular nuclear evolution of NGC 3379, NGC 3384, and NGC 3368?
O. K. Sil'chenko, A. V. Moiseev, V. L. Afanasiev +2
The central regions of the three brightest members of the Leo I galaxy group -- NGC 3368, NGC 3379, and NGC 3384 -- are investigated by means of 2D spectroscopy. In all three galax…
Shakhbazian compact galaxy groups. II. Photometric and spectroscopic study of ShCG 376
Hrant M. Tovmassian, H. Tiersch, V. H. Chavushyan +1
The results of the redshift measurements and of the detailed surface photometry in BVR of the compact group ShCG 376 are presented. The radial velocity dispersion, the virial mass,…
Around the Clock Observations of the Q0957+561 A,B Gravitationally Lensed Quasar II: Results for the second observing season
Wesley N. Colley, Rudolph E. Schild, Cristina Abajas +35
We report on an observing campaign in March 2001 to monitor the brightness of the later arriving Q0957+561 B image in order to compare with the previously published brightness obse…
Steps Toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XVI. A Thirteen-Year Study of Spectral Variability in NGC 5548
B. M. Peterson, the International AGN Watch
We present the final installment of an intensive 13-year study of variations of the optical continuum and broad H-beta emission line in the Seyfert 1 galaxy NGC 5548. The data base…
IRAS F02044+0957: radio source in interacting system of galaxies
O. V. Verkhodanov, V. H. Chavushyan, R. Mújica +2
The steep spectrum of IRAS F02044+0957 was obtained with the RATAN-600 radio telescope at four frequencies. Optical spectroscopy of the system components, was carried out with the…
BZ Cam during its 1999/2000 optical low state
J. Greiner, G. Tovmassian, M. Orio +6
We report optical observations of the VY Scl star BZ Cam during its previous optical low state in 1999/2000. We find drastic variations in the line profiles. Narrow-band imaging ob…
The FIRST-APM QSOs Survey in the SBS sky region
V. H. Chavushyan, V. O. Verkhodanov, R. Mujica +1
The main goal of the FIRST-APM QSO Survey (FAQS) survey is to compile the most complete sample of Bright QSOs, located in the well optically investigated area of the sky covered by…
Spectroscopy of Stellar-Like Objects Contained in the Second Byurakan Survey. I
J. A. Stepanian, V. H. Chavushyan, L. Carrasco +2
The results of spectroscopic observations of 363 star-like objects from the Second Byurakan Survey (SBS) are reported. This SBS's subsample has proven to be a rich source of newly…
Spectral Investigations of Objects from the Second Byurakan Survey. Stellar Objects. VI
J. A. Stepanian, V. A. Lipovetsky, V. H. Chavushyan +2
The data for 100 QSOs from the Second Byurakan Survey (SBS) located on the northern sky 8h < R.A. < 17h and 49deg < Dec. < 61deg are presented. The main parameters of emission line…
Spectral Observations of Faint Markarian Galaxies of the Second Byurakan Survey. II
L. Carrasco, H. M. Tovmassian, J. A. Stepanian +3
We continue the program of spectroscopic observations of objects from the Second Byurakan Survey (SBS). This survey contains more than 1300 galaxies and 1700 star-like objects with…