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We present surveys and related studies of active galaxies carried out at the Byurakan Astrophysical Observatory (BAO). This was one of the main research subjects at BAO during many years, since mid-1950s, when Viktor Ambartsumian suggested the hypothesis of the activity of the galactic nuclei. A number of surveys and searches for Active Galactic Nuclei (AGN) and other active galaxies were accomplished during 1960s-1980s. Since mid-1990s, our research group carried out new surveys and studies of active galaxies based on the First Byurakan Survey (FBS or Markarian Survey) and then a number of others. Here we also present the recent results of studies on active galaxies (both AGN and Starbursts) by the Extragalactic group of the Byurakan Astrophysical Observatory (BAO) Research Department “Astronomical Surveys”. These studies are characterized by multiwavelength approach to statistical analysis of large amount of data obtained in different wavelengths; from X-ray to radio. A fine classification scheme for active galaxies has also been suggested.

Section: Discussionmentioning

confidence: 99%

Surveys for active galaxies: discovery and studies

Mickaelian

Abrahamyan

Paronyan

et al. 2020

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“…BIG objects have been studied spectroscopically using BAO 2.6 m (Mickaelian et al, 2003, Special Astrophysical Observatory (SAO, Russia) 6 m (Balayan et al, 2001, Mickaelian et al, 1998, Observatoire de Haute-Provence (OHP, France) 1.93 m (Mickaelian, 2004) telescopes and the Sloan Digital Sky Survey (Abolfathi et al, 2018) (Mickaelian et al, 2018). Altogether 255 BIG objects have been studied and classified.…”

Section: Introductionmentioning

confidence: 99%

Building the Largest Sample of IR Galaxies. Preliminary Results

Mikayelyan,

Mickaelian,

Abrahamyan

et al. 2024

To build the IRAS full extragalactic sample (including both point-like sources - QSOs, and extended ones - galaxies), we have applied several approaches. Cross-correlation of IRAS PSC/FSC Combined Catalogue with optical catalogues of already known galaxies, quasars and blazars such as The NGC 2000.0 Catalog, Third Reference Catalogue of Bright Galaxies, The Roma BZCAT, Astrometric Catalogue 5 and many others. Cross-correlation of IRAS PSC/FSC Combined Catalogue with optical catalogues giving data, which can be used to determine galaxy candidates, for example Sloan Digital Sky Survey (SDSS, contains data about point like and extended objects), The APM North Catalogue (contains data about ellipticity of objects), etc. Cross-correlation of IRAS PSC/FSC Combined Catalogue with GAIA DR3, which gives data about proper motions of objects (we can consider the objects having real proper motions as stars and exclude them from the sample). If all data show the same type of object, then we give it as a genuine one, and if there is an ambiguity, we give the most probable type with a flag. All this will lead to construction of a confident sample of optical counterparts of extragalactic objects of IRAS PSC/FSC: galaxies and quasars. We also will study IR/opt flux ratios, which may serve as one more characteristic to reveal galaxies with very high SFR. We will carry out calculation of IR luminosities for all IR galaxies. We expect revelation of many new ULIRGs and HLIRGs and building their largest samples.

“…BIG objects have been studied spectroscopically using BAO 2.6 m (Mickaelian et al, 2003, Sargsyan and, Special Astrophysical Observatory (SAO, Russia) 6 m (Mickaelian et al, 1998, Balayan et al, 2001, Observatoire de Haute-Provence (OHP, France) 1.93 m (Mickaelian, 2004) telescopes and the Sloan Digital Sky Survey (Abolfathi et al, 2018) (Mickaelian et al, 2018). Altogether 255 BIG objects have been studied and classified.…”

Section: Introductionmentioning

confidence: 99%

Observations and Study of Byurakan-IRAS Galaxies: Summary

Mikayelyan

Mickaelian

Abrahamyan

et al. 2019

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The paper is a summary and general analysis of optical spectroscopic data on 257 Byurakan-IRAS Galaxies (BIG objects) obtained with the BAO 2.6-m, SAO 6-m, OHP 1.93-m telescopes and taken from SDSS spectroscopic database. 149 star-formation regions galaxies, 42 galaxies with active nuclei, and 28 galaxies with a composite spectrum were identified. The spectra of 21 galaxies show signs of emission, but without the possibility of more precise determination of their activity type, 13 galaxies appear to have star formation rates that do not exceed normal, and 3 are absorption galaxies.