An X-ray survey of variable radio bright quasars
Technical Report
·
OSTI ID:6532182
A sample consisting primarily of radio bright quasars was observed in X-rays with the Einstein Observatory for times ranging from 1500 to 5000 seconds. Detected sources had luminosities ranging from 0.2 to 41.0 x 10 to the 45th power ergs/sec in the 0.5 to 4.5 keV band. Three of the fourteen objects which were reobserved showed flux increases greater than a factor of two on a time scale greater than six months. No variability was detected during the individual observations. The optical and X-ray luminosities are correlated, which suggests a common origin. However, the relationship (L sub x is approximately L sub op to the (.89 + or - .15)) found for historic radio variables may be significantly different than that reported for other radio bright sources. Some of the observed X-ray fluxes were substantially below the predicted self-Compton flux, assuming incoherent synchrotron emission and using VLBI results to constrain the size of the emission region, which suggests relativistic expansion in these sources. Normal CIV emission in two of the sources with an overpredicted Compton component suggests that although they, like BL Lac objects, have highly relativistic material apparently moving at small angle to the line of sight, they have a smaller fraction of the continuum component in the beam.
- Research Organization:
- National Aeronautics and Space Administration, Greenbelt, MD (USA). Goddard Space Flight Center
- OSTI ID:
- 6532182
- Report Number(s):
- N-8424512; NASA-TM-86094
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
640103* -- Astrophysics & Cosmology-- Quasi-Stellar
Radio
& X-Ray Sources-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BASIC INTERACTIONS
BL LACERTAE OBJECTS
BREMSSTRAHLUNG
COMPTON EFFECT
COSMIC RADIO SOURCES
DOPPLER EFFECT
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FLUX DENSITY
GALAXIES
INTERACTIONS
IONIZATION
IONIZING RADIATIONS
MAGNETIC FIELDS
MASSLESS PARTICLES
PHOTOIONIZATION
PHOTONS
QUASARS
RADIATIONS
RADIO GALAXIES
RED SHIFT
SCATTERING
SYNCHROTRON RADIATION
TEMPERATURE EFFECTS
X RADIATION
Radio
& X-Ray Sources-- (-1987)
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BASIC INTERACTIONS
BL LACERTAE OBJECTS
BREMSSTRAHLUNG
COMPTON EFFECT
COSMIC RADIO SOURCES
DOPPLER EFFECT
ELASTIC SCATTERING
ELECTROMAGNETIC INTERACTIONS
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
FLUX DENSITY
GALAXIES
INTERACTIONS
IONIZATION
IONIZING RADIATIONS
MAGNETIC FIELDS
MASSLESS PARTICLES
PHOTOIONIZATION
PHOTONS
QUASARS
RADIATIONS
RADIO GALAXIES
RED SHIFT
SCATTERING
SYNCHROTRON RADIATION
TEMPERATURE EFFECTS
X RADIATION