Physical parameters and classification of eight galactic nuclei from the Second Byurakan Survey

Abstract

Spectroscopic observations with a resolution of 4.5 Angst were performed for a sample of eight galactic nuclei extracted from the Second Byurakan Survey, and one companion galaxy of SBS 1204+505B. The EW and FWHM of the emission lines were measured, and useful line ratios and diagnostic diagrams were used for object classification and reddening estimates. Intrinsic reddening quantities were calculated for all non QSO,i.e. seven objects. Particularly the amount of reddening, BV color excess, extinction coefficient and optical depths in the V band, at Halpha and Hbeta wavelengths, and at 5100 Angst. The broad line region size was also estimated for seven objects, as well as the central black hole masses. Three mass estimates were usually performed for each object and compared. A peculiar line, probably He I lambda 5048, is detected in the QSO SBS 1626+554. Evidence for a stratified narrow line region is found for the two narrow line Seyfert 1 galaxies included in the sample. A revised classification is proposed for two objects, and the companion galaxy of SBS 1204+505B is reported as a nuclear starburst galaxy.

To appear in PASP

References in corpus (29)

• Maps of Dust IR Emission for Use in Estimation of Reddening and CMBR Foregrounds
• A Fundamental Relation Between Supermassive Black Holes and Their Host Galaxies
• The Host Galaxies of AGN
• A Relationship Between Nuclear Black Hole Mass and Galaxy Velocity Dispersion
• The slope of the black-hole mass versus velocity dispersion correlation
• The Host Galaxies and Classification of Active Galactic Nuclei
• Reverberation Measurements for 17 Quasars and the Size-Mass-Luminosity Relations in Active Galactic Nuclei
• The u'g'r'i'z' Standard Star Network
• The Relationship Between Luminosity and Broad-Line Region Size in Active Galactic Nuclei
• Supermassive Black Holes in Active Galactic Nuclei. II. Calibration of the M-sigma Relationship for AGNs
• A Search for "Dwarf" Seyfert Nuclei. IV. Nuclei with Broad H-alpha Emission
• A Comprehensive Spectral and Variability Study of Narrow-Line Seyfert 1 Galaxies Observed by ASCA: II. Spectral Analysis and Correlations
• Locally Optimally Emitting Clouds and the Origin of Quasar Emission Lines
• Supermassive Black Holes in Active Galactic Nuclei. I. The Consistency of Black Hole Masses in Quiescent and Active Galaxies
• A spectrophotometric atlas of Narrow-Line Seyfert 1 galaxies
• Black Hole Mass, Velocity Dispersion and the Radio Source in AGN
• Searching For the Physical Drivers of Eigenvector 1: Influence of Black Hole Mass and Eddington Ratio
• Locally Optimally-emitting Clouds and the Narrow Emission Lines in Seyfert Galaxies
• Narrow-line Seyfert 1 Galaxies from the Sloan Digital Sky Survey Early Data Release
• AGNs with composite spectra II. Additional data
• The black hole--bulge relation in AGNs
• Nuclear activity and massive star formation in the low luminosity AGN NGC4303: Chandra X-ray observations
• The Narrow Line Region of Narrow-Line Seyfert 1 Galaxies
• X-ray Emission from NGC 1808: More than a Complex Starburst
• Searching for the Physical Drivers of Eigenvector-1: From Quasars to Nano-Quasars
• Probing the Ionizing Continuum of Narrow-Line Seyfert 1 Galaxies. I.Observational Results
• Radio Observations of 4079 Quasars
• [O III] emission line in narrow-line Seyfert 1 galaxies
• SDSS J143030.22-001115.1: A misclassified narrow-line Seyfert 1 galaxy with flat X-ray spectrum