The relation of Second Byurakan Survey galaxies with Zwicky clusters. I. Data

In the region of the sky covered by both the Second Byurakan Survey (SBS) and the Zwicky Catalog of Galaxies and Clusters of Galaxies (CGCG) 892 of the 1677 active galaxies lie within the contours of Zwicky clusters. Data on these galaxies and the corresponding clusters are listed in tables according to whether they are actual, probable, or random members of clusters or are projected on them. __________ Translated from Astrofizika, Vol. 51, No. 3, pp. 423–430 (August 2008).     

Properties of Galaxies in the Second Byurakan Survey. I. Diagnostic Diagrams

The relative intensities and equivalent widths of emission lines are determined for a number of galaxies in the Second Byurakan Survey for which basic data have been published previously. Diagnostic diagrams are constructed. The properties of this subsample of the galaxies in the survey are discussed.     

Spectroscopic investigation of objects of the Second Byurakan Survey. Stellar objects. V

Byurakan Astrophysical Observatory; Special Astrophysical Observatory. Translated from Astrofizika, Vol. 34, No. 3, pp. 315–325, May–June, 1991.     

Spectroscopic investigations of objects of the Second Byurakan Survey. Stellar objects. IV

Byurakan Astrophysical Observatory; Special Astrophysical Observatory, USSR Academy of Sciences. Translated from Astrofizika, Vol. 34, No. 1, pp. 5–12, January–February, 1991.     

Objects with a Continuum Spectrum in the Second Byurakan Sky Survey

Results from a study of objects with continuum spectra sampled by the Second Byurakan Sky Survey are presented. Spectra of the brightest objects were obtained with the 2.6 m telescope at the Byurakan Observatory. Cross correlations are made with catalogs of infrared, radio, and x-ray sources.     

Spectroscopy of Galaxies in Selected Fields of the Second Byurakan Survey

Spectroscopic data are presented for 35 galaxies from selected fields of the Second Byurakan Survey (SBS). The observations were made on the 2.6 m telescope at the BAO using the SCORPIO spectral camera. A majority of the objects were observed for the purpose of improving the classification of types in accordance with an adapted scheme presented in this paper.     

Optical identification of IRAS point sources based on low-dispersion spectra from the First Byurakan Survey. V

Part five of optically identified point sources from the IRAS Point Source Catalog (PSC) contains data on 19 late-type stars. The identifications were based on the Digitized Sky Survey (DSS), the First Byurakan Survey (FBS), blue and red maps of the Palomar survey (POSS), and infrared fluxes at 12, 25, 60, and 100 mm in the region of +61° ≤ δ ≤ +65° and 05 ^h 30 ^m ≤ α ≤ 18 ^h 35 ^m with an area of 357 sq. deg. Of the 76 objects given in the IRAS PSC as unidentified sources of infrared radiation, 51 are associated with known stars in existing catalogs, 6 are objects from the FBS of late-type stars, and 19 sources remained unknown in the optical range. For the identified stars we determined the optical coordinates, their departures from the IR coordinates, the Vstellar magnitudes, the color indices CI,and the preliminary spectral subtypes. The objects have optical magnitudes in the range of 8 ^m −16 ^m .Gas-dust shells are assumed to exist around four of the sources. Finder charts from the DSS are given for 19 of the objects. Translated from Astrofizika, Vol. 42, No. 1, pp. 53–59, January–March, 1999.     

Properties of Galaxies in the Second Byurakan Survey. II. Characteristic Features of a Separate Sample of Galaxies

Some features of a sample of galaxies from the Second Byurakan Survey are discussed. Most of them are small galaxies with star formation. It is shown that different types of galaxies are in the Survey, with high, medium, and low levels of excitation and continua ranging from blue to relatively red. Many of the galaxies have absorption lines in their spectra; their continua are formed by stars in later spectral classes.     

Surface photometry of blue compact dwarf galaxies from the Byurakan lists

Surface photometry of 23 ultraviolet excess galaxies from the two Byurakan surveys (FBS and SBS), selected to be blue compact dwarf candidates, has been made in B and R colors. A remarkable fraction of the sample exhibit a projected brightness distribution following the same de Vaucouleurs law as the bright spheroidal objects of the field (ellipticals and bulges of spirals). The other most frequent morphological type has an exponential brightness distribution, therefore similar to usual dwarf Magellanic irregulars. From their small absolute dimensions and average high effective surface brightness, the studied objects are indeed compact in the usual empirical sense.This article was presented as a report at the French-Armenian Colloquium (seeAstrofizika, 38, No. 4, 1995). Since it was submitted for publication slightly late, it was decided to include it in the present issue.Published in Astrofizika, Vol. 39, No. 1, pp. 91–100, January–March, 1996.     

Spectroscopic Study of a Large Sample of Galaxies Discovered in the Second Byurakan Survey Fields

The Second Byurakan Survey (SBS) is a well known combined survey, which uses the presence of UV-excess radiation in the continuum, or the presence of emission-lines in the spectra for the identification of active and star-forming galaxies. This paper reports on a comparative study of 77 galaxies identified with UV-excess, and 34 galaxies identified via emission-line techniques in the fields of the SBS. The spectroscopic parameters used for the comparison are the [OII]3727/H and [OIII]5007/H emission-lines ratios, the equivalent widths of [OII]3727, [OIII]5007 and H emission-lines, and the C _[OII]-C _H index. Spectroscopic parameters as well as new redshifts were determined from the spectra obtained with the 6m telescope of the Special Astrophysical Observatory (Russia). The main results are: 1) Galaxies discovered via UV-excess technique are preferably more active. 2) Galaxies discovered via emission-line technique are preferably high-excitation low-luminosity star-forming galaxies. 3) UV-excess galaxies with faintest UV-excess radiation are likely candidates to be LINER or Sy2 type objects.     

Relationship of galaxies from the second Byurakan survey to Zwicky clusters. II. Discussion

We analyze the data presented in a previous paper by Gyulzadyan and Petrosian, and discuss the results of a statistical investigation of the relationship between SBS galaxies and Zwicky clusters. The main results are that SBS galaxies follow the overall galaxy distribution in clusters and they do not avoid any type of Zwicky cluster. There is a significantly higher probability of finding SBS galaxies occurring in medium compact clusters than in open clusters. They also follow the well-established morphology-density relation. Earlier morphological type, higher luminosity, larger linear size, and redder SBS galaxies tend to be found in clusters with higher compactness, or in more compact regions of the clusters. The number distribution of SBS galaxies in Zwicky open clusters probably follows the distribution of normal galaxies. The number distribution of SBS galaxies in medium compact and compact clusters shows two-maxima structure. Published in Astrofizika, Vol. 52, No. 2, pp. 225–236 (May 2009).