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  • 1
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    Spectrophotometry of Michigan-Tololo quasars (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The Michigan-Tololo sample of quasars is discussed using observational data for 48% of this sample. Emission-line quasar characteristics are confirmed for 80% of the objects observed, including at least four new quasars with spectral features indicative of 'supernova-like' outflow. Approximately 73% of the redshifts predicted from the discovery plates are found to be accurate, with a mean error in z of 0.03; a large range of z (from about 0.1 to 3.16) is represented in the sample. The interpretation of the observed redshift distribution for quasars is strongly dependent upon the significance ascribed to wavelength-dependent selection effects. It appears that the behavior of the comoving quasar density above z = 2.0 may be represented by a constant or an exponential increase.
    Keywords: ASTROPHYSICS
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Curtis Schmidt-thin prism survey for extragalactic emission-line objects - University of Michigan List I (1977)
    In:  Other Sources
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    Publication Date: 2019-06-27
    Keywords: ASTRONOMY
    Type: Astrophysical Journal Supplement Series; 34; May 1977
    Format: text
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  • 3
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    Spectrophotometry of the Seyfert galaxy NGC 4593 (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Spectrophotometry of the bright class 1 Seyfert galaxy NGC 4593 is presented. The emission-line characteristics are briefly discussed and compared with those of other Seyfert galaxies. The measured hydrogen Balmer-line ratios are reasonably consistent with expected recombination values, and the emission intensities of Fe II, He I 5876, and forbidden O III 4363 relative to other lines are stronger than average in NGC 4593.
    Keywords: ASTRONOMY
    Type: Astronomical Society of the Pacific; vol. 91
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  • 4
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    Spectrophotometry of Michigan-Tololo quasars (1979)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: Emission-line quasar characteristics are confirmed for 80% of the objects observed, including at least four new quasars with spectral features indicative of supernova-like outflow. Approximately 73% of the redshifts predicted from the discovery plates are found accurate with a mean error in z of 0.03, and a large range of z (from about 0.1 to 3.16) is represented in the sample. The observed redshift distribution for quasars is marginally consistent with a constant co-moving quasar density above z approximately 2.0. The shape of the redshift distribution may be used as an isotropy probe with a cosmic time resolution of a few times one-hundred million years in the early universe; therefore, continued surveys of this sort are important even if accurate magnitudes are not determined.
    Keywords: ASTRONOMY
    Type: NASA-CR-158873
    Format: application/pdf
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