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- W2019176912 abstract "view Abstract Citations (127) References (36) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS A complete sample of quasars at B = 19.80. Marshall, H. L. ; Avni, Y. ; Braccesi, A. ; Huchra, J. P. ; Tananbaum, H. ; Zamorani, G. ; Zitelli, V. Abstract A quasar candidate spectroscopic UV-excess survey with B less than 19.80 has yielded 35 quasars in the 1.75 sq deg region studied. The X-ray data for the 35 quasars are used to show that quasars with B lower than 19.80 and z lower than 2.2 constitute 24 + 10, -8 percent of the observed X-ray background at 2 keV. This sample is combined with one containing 22 quasars with B values lower than 18.25, and it is noted that fits of evolution and luminosity functions are substantially similar to previous results, although the confidence limits for the model parameters are reduced by a factor of 2. Pure luminosity evolution models are found to produce very good fits to the observed N(less than B) data, and are used to estimate the overall contribution of quasars to the X-ray background. Publication: The Astrophysical Journal Pub Date: August 1984 DOI: 10.1086/162272 Bibcode: 1984ApJ...283...50M Keywords: Astronomical Catalogs; Data Sampling; Quasars; Ultraviolet Astronomy; X Ray Sources; Emission Spectra; Luminosity; Optical Measurement; Red Shift; Astrophysics full text sources ADS | data products NED (56)" @default.
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- W2019176912 date "1984-08-01" @default.
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- W2019176912 title "A complete sample of quasars at B = 19.80" @default.
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