X-ray properties of quasars and results from a deep X-ray survey of optically selected objects

Journal Article · Tue Oct 01 04:00:00 EDT 1985 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/163514· OSTI ID:5733780

Kriss, G A; Canizares, C R

A sample of 178 optically selected quasars and Seyfert galaxies is studied. Seventy seven of the objects have measured X-ray fluxes while the remainder have upper limits. The analysis strengthens and confirms the conclusion of Avni and Tananbaum (1982) that the X-ray-to-optical luminosity ratio of optically selected quasars decreases with increasing optical luminosity. The dependence of the ratio on look-back time is small and may be null. This suggests that the effect is intrinsic to the physical processes that give rise to the nonthermal emission in quasars. 43 references.

• Research Organization: Michigan Univ., Ann Arbor; MIT, Cambridge, MA
• OSTI ID: 5733780
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 297; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640103* -- Astrophysics & Cosmology-- Quasi-Stellar
Radio
& X-Ray Sources-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
DISTRIBUTION FUNCTIONS
ELECTROMAGNETIC RADIATION
FLUX DENSITY
FUNCTIONS
GALAXIES
IONIZING RADIATIONS
LUMINOSITY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
QUASARS
RADIANT FLUX DENSITY
RADIATIONS
RED SHIFT
SEYFERT GALAXIES
SPECTRA
VISIBLE SPECTRA
X RADIATION