view Abstract Citations (90) References (48) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS The Relative Number of Seyfert 2 Galaxies. I. Spectra of Emission-Line Galaxies in the Wasilewski Field Osterbrock, Donald E. ; Shaw, Richard A. Abstract Slit spectra were obtained of all the Seyfert galaxy candidates and many other emission-line galaxies discovered (or recovered) by Wasilewski in his objective-prism survey centered on the region of the north Galactic pole. Redshifts and relative emission-line fluxes were measured for these galaxies, and all of their spectra were classified. Among the Wasilewski candidates, Was 26 is a Seyfert 1, Was 45 is a Seyfert 1.9, and Was 2 and Was 31 are Seyfert 2 galaxies. The other Seyfert 2 candidates he identified are actually H II region galaxies. Including previously known Seyfert galaxies in this region, it is confirmed that the relative number of Seyfert 2 galaxies, down to a given apparent magnitude, is large. Per unit volume of space, the relative numbers of Seyfert (1 + 1.5) to Seyfert (1.8 + 1.9) to Seyfert 2 are approximately 0.1/0.1/0.8. If the same galaxies were to evolve through all these stages, they would spend most of their AGN lifetimes as Seyfert 2s. If all Seyfert nuclei were similar objects with central broad-line regions hidden by obscuring disks to various extents, the disks would be thick and the line broadening due to any presumed rotational or radial velocity field in the plane of the disk would be greatly reduced by projection effects. Publication: The Astrophysical Journal Pub Date: April 1988 DOI: 10.1086/166172 Bibcode: 1988ApJ...327...89O Keywords: Emission Spectra; H Ii Regions; Line Spectra; Red Shift; Seyfert Galaxies; Stellar Luminosity; Galactic Nuclei; H Alpha Line; H Beta Line; Signal To Noise Ratios; Astrophysics; GALAXIES: REDSHIFTS; GALAXIES: SEYFERT; LUMINOSITY FUNCTION full text sources ADS | data products SIMBAD (42) NED (36)