### Emission-line galaxies and quasars in the southern hemisphere. I. Description and applications of an objective-prism surveyEmission-line galaxies and quasars in the southern hemisphere. I. Description and applications of an objective-prism survey

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 Author Smith, M. G. Sponsorship USDOE Source United States Department of Energy Office of Scientific and Technical Information Content type Text Language English
 Subject Keyword Physics (Astrophysics & Cosmology)-Galaxies ♦ Physics (Astrophysics & Cosmology)-Quasi-stellar, Radio & X-Ray Sources ♦ Physics Research-Astrophysics & Cosmology- Galaxies ♦ GALAXIES- EMISSION SPECTRA ♦ QUASARS- EMISSION SPECTRA ♦ SEYFERT GALAXIES- EMISSION SPECTRA ♦ DOPPLER EFFECT ♦ INSTABILITY ♦ LUMINOSITY ♦ RED SHIFT ♦ STAR EVOLUTION Abstract A selection of objects from the first plates of a low-dispersion, objective-prism survey for emission-line galaxies and quasars is used to illustrate the application of the survey to the following lines of research in extragalactic astronomy: quasi-stellar objects, Seyfert galaxies, instabilities in galaxies produced by tidal interaction or explosive events, and rates of star formation and the general chemical evolution of galaxies. Included in the discussion is a description of how the survey provides a new, purely optical, color-independent method for the direct isolation of bright, high-redshift QSOs with strong emission lines (L$alpha$ is often directly visible on the Schmidt- survey plates). The newly discovered objects used for illustration are a radio- quiet QSO of redshift 2.07, a luminous, class 2 Seyfert galaxy, a compact blue emission-line galaxy with a jet or streamer, yet with no obvious interacting companion, and a blue galaxy with H$beta$ flux 50 times that of 30 Doradus, and low metal abundances, which is undergoing a very intense burst of star formation. These objects are to be discussed in greater detail in subsequent papers in this series. (AIP) Educational Use Research Learning Resource Type Article Publisher Date 1975-12-15 Publisher Place United States Journal Astrophys. J. Volume Number 202 Issue Number 3 Organization Cerro Tololo Inter-American Observatory, La Serena, Chile