On the ratio of the infrared-to-ultraviolet continuum to the X-rays in quasars and active galaxies
Journal Article
·
· Astrophys. J.; (United States)
A sample of 122 quasars and Seyfert galaxies was analyzed and it was found that the NIR 7500 A rest frame luminosity is more linearly related to the X-ray luminosity than is the optical luminosity. It is also found that the mean spectral slope between 7500 and 4200 A in the rest frame monotonically flattens with luminosity over more than three orders of magnitude. The present results support models which attribute the IR and X-ray continua to linked nonthermal processes such as synchrotron self-Compton, while the blue-UV bump comes from a different source, such as an accretion disk. 46 refs.
- Research Organization:
- NASA, Goddard Space Flight Center, Greenbelt, MD (USA); Stanford Univ., CA (USA)
- OSTI ID:
- 5629396
- Journal Information:
- Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 339; ISSN ASJOA
- Country of Publication:
- United States
- Language:
- English
Similar Records
UV excess of quasars - Luminosity dependence
Continuum distributions of active galactic nuclei. [Radio, optical, infrared, and x-ray]
Nearly simultaneous optical, ultraviolet, and x ray observations of three PG quasars. Final technical report
Journal Article
·
Fri May 01 00:00:00 EDT 1987
· Astrophys. J.; (United States)
·
OSTI ID:6270215
Continuum distributions of active galactic nuclei. [Radio, optical, infrared, and x-ray]
Thesis/Dissertation
·
Sat Dec 31 23:00:00 EST 1983
·
OSTI ID:5413050
Nearly simultaneous optical, ultraviolet, and x ray observations of three PG quasars. Final technical report
Technical Report
·
Wed Feb 28 23:00:00 EST 1990
·
OSTI ID:6770434
Related Subjects
640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
640105 -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCRETION DISKS
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
ELECTROMAGNETIC RADIATION
GALAXIES
GALAXY NUCLEI
INFRARED RADIATION
IONIZING RADIATIONS
LUMINOSITY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
QUASARS
RADIATIONS
RED SHIFT
SEYFERT GALAXIES
SPECTRA
ULTRAVIOLET RADIATION
VISIBLE SPECTRA
X RADIATION
Radio & X-Ray Sources
640105 -- Astrophysics & Cosmology-- Galaxies
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ACCRETION DISKS
COSMIC RADIO SOURCES
COSMIC RAY SOURCES
COSMIC X-RAY SOURCES
ELECTROMAGNETIC RADIATION
GALAXIES
GALAXY NUCLEI
INFRARED RADIATION
IONIZING RADIATIONS
LUMINOSITY
OPTICAL PROPERTIES
PHYSICAL PROPERTIES
QUASARS
RADIATIONS
RED SHIFT
SEYFERT GALAXIES
SPECTRA
ULTRAVIOLET RADIATION
VISIBLE SPECTRA
X RADIATION