Byurakan Astrophysical Observatory Research Department “Astronomical Surveys”: recent results

We review the field of active galaxies (both AGN and Starbursts) focusing on their multiwavelength search and studies at the Byurakan Astrophysical Observatory (BAO). Many famous historical surveys carried out in Byurakan are known and many more are active and ongoing. We give examples of studies in optical wavelengths, IR, radio and X-ray, as well as multiwavelength studies. The studies are characterized by a multiwavelength approach to statistical analysis of a large amount of data obtained in different wavelengths. Results on HRC/BHRC sample objects (optical identifications of ROSAT X-ray sources), studies of Markarian galaxies in UV and multiwavelength SEDs, abundance and star formation determinations in Mrk galaxies from SDSS spectra, revised optical classification of “LINERs”, study and classification of SDSS spectra for Byurakan-IRAS Galaxies, summary of observations and study of Byurakan-IRAS Galaxies (BIG objects), discovery of new bright ULIRGs from the IRAS PSC/FSC Combined Catalogue and their spectral classification, radio variable sources at 1400 MHz and their optical variability, classification of BZCAT objects having uncertain types (BZU objects), and optical variability of blazars are presented. At the end, we briefly present our new fine classification of active galaxies based on all our previous studies.