Title: ROSAT observations of Z greater than 3 quasars
Abstract: view Abstract Citations (17) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS ROSAT Observations of z>3 Quasars Pickering, T. E. ; Impey, C. D. ; Foltz, C. B. Abstract Successful pointed observations using the ROSAT PSPC were made of seven z > 3 optically selected quasars from the Large Bright Quasar Survey (LBQS). Four detections and three 3σ upper limits resulted. Combining these data with the heterogeneous sample of Avni & Tananbaum [ApJ, 305,83(1986)] confirms their conclusion that the ratio of x-ray to optical luminosity is correlated with optical luminosity and probably not correlated with redshift. This suggests that x-ray luminosity evolves more slowly than optical luminosity. These results are then used in conjunction with the LBQS database to estimate the contribution to the 2 keV x-ray background of bright, optically selected quasars with m_B_j__ < 18.85; the result is about 5%. Publication: The Astronomical Journal Pub Date: November 1994 DOI: 10.1086/117175 Bibcode: 1994AJ....108.1542P Keywords: Active Galactic Nuclei; Light (Visible Radiation); Quasars; Rosat Mission; Sky Surveys (Astronomy); Stellar Luminosity; Stellar Spectra; X Ray Astronomy; X Ray Spectra; Astronomical Spectroscopy; Background Radiation; Proportional Counters; Red Shift; Regression Analysis; Stellar Radiation; Astronomy; GALAXIES: DISTANCES AND REDSHIFTS full text sources ADS | data products SIMBAD (7) NED (7) HEASARC (1)
Publication Year: 1994
Publication Date: 1994-11-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 12
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