منابع مشابه
On the QSO content of the First Byurakan Survey and the completeness of the Palomar Green Survey
The second part of the First Byurakan Survey is aimed at detecting all bright (B < 16.5) UV-excess starlike objects in a large area of the sky. By comparison with major X-ray and radio surveys we tentatively identified as QSOs 11 FBS objects. We made spectroscopic observations of nine of them. We found six new QSOs bringing the total number of known QSOs in this survey to 42. By comparison with...
متن کاملPhotometry from online Digitized Sky Survey Plates
Online Digital Sky Survey (DSS) material is often used to obtain information on newly discovered variable stars for older epochs (e.g. Nova progenitors, flare stars, . . . ). We present here the results of an investigation of photometry on online digital sky survey material in small fields calibrated by CCD sequences. We compared different source extraction mechanisms and found, that even down ...
متن کاملThe DFBS Spectroscopic Database and the Armenian Virtual Observatory
The DFBS is the digitized version of the famous Markarian Survey. It is the largest low-dispersion spectroscopic survey of the sky covering 17,000 square degrees at galactic latitudes |b|>15. DFBS provides images and extracted pectra for all objects present in the FBS plates. Programs were developed to compute astrometric solution, extract spectra, and apply wavelength and photometric calibrati...
متن کاملPhysical Parameters and Classification of Eight Galactic Nuclei from the Second Byurakan Survey
Accurate spectral parameters estimates are essential to investigate the physical conditions in AGNs. Particularly, intrinsic reddening can be estimated from the Hα/Hβ ratio of the narrow line components. The mass of the central black hole can be obtained from the stellar velocity dispersion in the bulge, which can be estimated from the [O III] λ5007 width, or by the relation between the AGN lum...
متن کاملA Multiwavelength study of NLS1s galaxies from the Second Byurakan Survey
In this work we present a multiwavelength study of narrow-line Seyfert 1 galaxies (NLS1s) discovered in the Second Byurakan Survey (SBS). The sample consists of 26 objects, which have MB ≥ −23.0, or −19.9 > MB > −23.0, 0.0243 < z < 0.317 and 15.2 < B < 19.0. For these objects, we present accurate coordinates, magnitudes, redshifts and the identification of optical objects with X-ray, IR and rad...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2007
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361:20066241