Research Interests 

 

1. •Wide-Field surveys (AGNs, Galaxies, CV, White dwarfs and hot subdworfs)
   

2. •Active Galactic Nuclei and Quasars  (Central Engine and Environment)
   

3. •Compact Groups of Galaxies
   

4. •Observational Astronomy
   
   

My main area of study is the multiwavelength observations and interpretation of the processes going on around supermassive black holes (BH): the nature of the power source in active galactic nuclei (AGNs); the cosmological evolution of supermassive BH and their host galaxies, and relationships with environment in small and large scales. One of my long-term interests has been variability of the radiation from AGNs to probe what is going on around the supermassive BH (structure and kinematics of the broad/narrow-line emission regions) and power generation.

Education

1. •1995 Ph.D. (Physics & Mathematics, Specialisation - Astronomy & Radioastronomy) Special Astrophysical Observatory, Russian Academy of Sciences, Russia. Thesis: "Quasistellar objects of the Second Byurakan sky Survey."  Advisor: Dr. J.A. Stepanian
   

2. •1986 M.Sc. (Physics, Specialisation - Astrophysics) Yerevan State University, Department of Astrophysics, Armenia. Thesis: "Spectral and photometrical investigation of the dwarf irregular galaxies Markarian 773 and Markarian 1006" Advisors: Prof. E.Y. Khachikian and Dr. A.R. Petrossian
   

3. •1984  B.Sc. (Physics) Yerevan State University, Faculty of Physics, Armenia
   

Recent publications

Published Refereed papers

Koulouridis, E.; Plionis, M.; Chavushyan, V.; Dultzin, D.; Krongold, Y.; Georgantopoulos, I.; Leon-Tavares, J., 2013, A&A, 552, 135. Activity of the Seyfert galaxy neighbours.

León-Tavares, J.; Chavushyan, V.; Patiño-Alvarez, V.; Valtaoja, E. Arshakian, T.;G. Popovich, L.C.; Tornikoski, M.; Lobanov, A.; Carramiñana , A.; Carrasco, L.; Lahteenmaki, A., 2013, ApJL, 763, 36. Flare-like variability of the Mg II λ2800Å emission line in the γ-ray blazar 3C 454.3.

Benítez, Erika; Méndez-Abreu, Jairo; Fuentes-Carrera, Isaura; Cruz-González, Irene; Martínez, Benoni; López-Martin, Luis; Jiménez-Bailón, Elena; Chavushyan, Vahram; León-Tavares, Jonathan, 2013, ApJ, 763, 36. Characterization of a sample of intermediate-type AGN. II. Host Bulge Properties and Black Hole Mass Estimates.

Benítez, Erika; Méndez-Abreu, Jairo; Fuentes-Carrera, Isaura; Cruz-González, Irene; Martínez, Benoni; López-Martin, Luis; Jiménez-Bailón, Elena; León-Tavares, Jonathan; Chavushyan, Vahram H., 2013, ApJ, 763, 36. Characterization of a Sample of Intermediate-type AGNs. I. Spectroscopic Properties and Serendipitous Discovery of New Dual AGNs.

Arshakian, T.G.; Leon-Tavares, J.; Botcher, M.; Torrealba, J.; Chavushyan, V.; Lister, M.L.; Ros. E.; Zensus, J.A., 2012, A&A, 537, 32. Radio-Optical-Gamma-Ray properties of MOJAVE AGN detected by Fermi/LAT.

Masetti, N.; Parisi, P.; Jimenez-Bailon, E.; Palazzi, E.; Chavushyan, V.; Bassani, L.; Bazzano, A.; Bird, A.J.; Dean, A.J.; Galaz, G.; Landi, R.; Malizia, A.; Minniti, D.; Morelli, L.; Schiavone, F.; Stephen, J.B.; Ubertini, P, 2012, A&A 538, 123. Unveiling the nature of INTEGRAL objects through optical spectroscopy IX. Twenty two more identifications, and a glance into the far hard X-ray Universe.

Jimenez-Bailon, E.; Chavushyan, V.; Schartel, N.; Santos-Lleo, M.; Huerta, E. M.; Krongold, Y., 2012, AJ, 143, 64.  The Nature of Hard X-ray Extragalactic Sources observed with XMM-Newton.

Torrealba, J.; Chavushyan, V.; Cruz-González, I.; Arshakian, T.G.; Bertone, E.; Rosa-González, D., 2012, RevMexAA, 47, 9. Optical Spectroscopic ATLAS of the MOJAVE/2cm AGN Sample.

Mezcua, M.; Chavushyan, V.H. Lobanov, A.P.; Leon-Tavares, J., 2012, A&A, 544, 36. Starbursts and black hole masses in X-shaped radio galaxies: Signatures of a merger event?

Shapovalova, A. I.; Popovic, L. C.; Burenkov, A. N.; Chavushyan, V. H.; Ilic, D.; Kovacevic, A.; Kollatschny, W.; Kovacevic, J.; Bochkarev, N. G.; Valdes, J. R.; and 7 coauthors, 2012, ApJS, 202, 10. Spectral Optical Monitoring of the Narrow Line Seyfert 1 galaxy Ark 564.

Parisi, P.; Masetti, N.; Jiménez-Bailón, E.; Chavushyan, V.; Landi, R.; Malizia, A.; Palazzi, E.; Bassani, L.; Bazzano, A.; Bird, A. J.; and 5 coutors, 2012, A&A, 545, 101. Accurate classification of 29 objects detected in the 39 months Palermo Swift/BAT hard X-ray catalogue.

The Astronomer’s Telegram

Carrasco, L.; Luna, A.; Escobedo, G.; Mayya, D. Y.; Carraminana, A.; Chavushyan, V., 2012, ATel # 4559. NIR brightening of the Quasar PKS2209+236.

Parisi, P.; Masetti, N.; Bassani, L.; Landi, R.; Chavushyan, V.; Jimenez-Bailon, E.; Morelli, L.; Bazzano, A.; Bird, A. J.; Ubertini, P., 2012, ATel #4151. AGN in the INTEGRAL/IBIS 9-year Galactic hard X-ray survey.

Masetti, N.; Jimenez-Bailon, E.; Chavushyan, V.; Parisi, P.; Bazzano, A.; Landi, R.; Bird, A.J.. 2012. ATel #4248. Optical spectroscopy of X-ray source IGR J22534+6243.

Conference Proceedings

Patiño-Álvarez, V.; Chavushyan, V.; León-Tavares, J.; Valdés, J. R.; Carramiñana, A.; Carrasco, L.; Torrealba, J., 2013, arXiv:1303.1893.  Optical Spectrophotometric Monitoring of Fermi/LAT Bright Sources. In 4th. Fermi Symposium, eConf Proceedings C121028.

Patiño-Álvarez, V.; Carramiñana, A.; Carrasco, L.; Chavushyan, V., 2013, arXiv:1303.1898. A Multiwavelength Cross-Correlation Variability Study of Fermi-LAT Blazars. In 4th. Fermi Symposium, eConf Proceedings C121028.

Dragana, Ilić; Popović, Luka Č.; Shapovalova, Alla I.; Burenkov, Alexander N.; Chavushyan, Vahram H.; Kovačević, Andjelka; Kollatschny, Wolfram, 2013, IAUS, 290, 205. The broad line emission from the AGN 3C 390.3: complex broad-line region and perturbation in accretion disk. Feeding Compact Objects: Accretion on All Scales, Proceedings of the International Astronomical Union.

Parisi, P.; Masetti, N.; Rojas, A. F.; McBride, V.; Steward, L.; Bassani, L.; Bazzano, A.; Bird, A. J.; Charles, P. A.; Chavushyan, V.; and 10 coauthors, 2013, arXiv:1302.6117. Identification of newly-discovered sources belonging to the 4th IBIS catalog and to the 54 months Palermo Swift/BAT catalog. Proceedings of "An INTEGRAL view of the high-energy sky (the first 10 years)" the 9th INTEGRAL Workshop.

Popovic, Luka; Chavushyan, Vahram; Ilic, Dragana; Kovacevic, Jelena; Shapovalova, Alla I.; Kovacevic, Andjelka; Burenkov, Alexander N., 2012, COSP, 39, 1521. Long-term optical spectral monitoring of Seyfert 1 galaxies: variability in the broad line region.

Ilić, Dragana; Popović, Luka Č.; Shapovalova, Alla I.; Burenkov, Alexander N.; Kollatschny, Wolfram; Kovačević, Andjelka; Chavushyan, Vahram; La Mura, Giovanni; Rafanelli, Piero, 2012, JPhCS, 397, 2050. Broad emission lines: A tool for studying nuclei of active galaxies.

Shcherbakov, A. S., Hanessian de La Garza, A. V., Chavushyan, V., Campos Acosta, J., 2012, SPIE, 8412, 84121F-1.Triple product acousto-optical processor for the astrophysical applications.

Shcherbakov, A. S., Hanessian de La Garza, A. V., Chavushyan, V., Nemov, S. A., 2012, SPIE, 8412, 84121E-1. Time-bandwidth product of the acousto-optical cell based on a TeO2-crystal.

Chavushyan, V.; Erastova, L.; Tovmassian, G.; Torrealba, J.;  Valdez, J.R. 2012, Baltic Astronomy, 21, 211. A new Symbiotic Star (SBS 0802+529) from the Second Byurakan Survey. In Asiago Meeting on Symbiotic Stars.

Shcherbakov, Alexandre S.; Hanessian de La Garza, Ana V.; Chavushyan, Vahram; Campos Acosta, Joaquin, 2012, SPIE, 8240, 36. Arrangement of an advanced acousto-optical processor for modeling the triple correlations of low-power optical pulse trains.

Shcherbakov, Alexandre S.; Hanessian de La Garza, Ana V.; Chavushyan, Vahram; Nemov, Sergey A., 2012, SPIE, 8240, 39.  A multi-phonon light-scattering and resolution of acousto-optic devices.