Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...316l..55w&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 316, May 15, 1987, p. L55-L58.
Astronomy and Astrophysics
Astrophysics
15
Galactic Nuclei, Luminous Intensity, Quasars, Radiation Spectra, Ultraviolet Radiation, Balmer Series, Black Body Radiation, Infrared Radiation
Scientific paper
The transition from the near-infrared power law to the blue bump in quasar spectra is studied by analyzing the complete sample published by Neugebauer et al. (1987). It is found that the flattening of the continuum spectrum toward the UV increases with continuum luminosity; the spectral slope between 4200 A and 7500 A (in the quasar's rest frame) is strongly correlated with luminosity and redshift. Only part of this correlation can be attributed to contamination by starlight of the host galaxy. This result is modeled in terms of an accretion disk spectrum combined with a nonthermal power law. In order to fit the data, the Eddington ratio must be in the range L(opt)/L(E) approximately 0.003-0.03(epsilon/0.1) exp -1 (epsilon being the efficiency). This parameter range also yields inner disk temperatures of (30,000-200,000 K), in accordance with the temperatures inferred from the UV excess of quasars observed with the IUE.
No associations
LandOfFree
The UV excess of quasars - Luminosity dependence does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with The UV excess of quasars - Luminosity dependence, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and The UV excess of quasars - Luminosity dependence will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-857143