Continuum energy distribution of quasars - Shapes and origins

Details Continuum energy distribution of quasars - Shapes and origins Continuum energy distribution of quasars - Shapes and origins

Dec 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...347...29s&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 347, Dec. 1, 1989, p. 29-51. Research supported by NASA IRAS Extended Missi

Astronomy and Astrophysics

Astronomy

584

Astronomical Spectroscopy, Continuous Spectra, Infrared Sources (Astronomy), Quasars, Spectral Energy Distribution, Spectrum Analysis, Accretion Disks, Blazars, Infrared Spectra, Seyfert Galaxies, Sky Surveys (Astronomy)

Scientific paper

Continuum observations from 0.3 nm to 6 cm are presented for 109 optically selected quasars from the Palomar-Green (PG) Bright Quasar Survey. The far-infrared to soft X-ray continuum of radio-quiet and steep-spectrum radio-loud PG quasars can be described in a model consisting of two broad peaks: an 'infrared bump' at about 2 microns to 1 mm and the well-known 'big blue bump' at about 10 nm to 0.3 micron. All PG quasars emit a significant fraction of their bolometric luminosity at infrared wavelengths of 1.5-100 microns. The fraction varies from 10 to 50 percent with a typical value of 30 percent. The ratio of the 6 cm flux density to that at 1 micron has a bimodal distribution. There is no evidence for a tight correlation between the infrared and X-ray continua of quasars. It is suggested that the bulk of the emission between 2 microns and 1 mm in the infrared bump of the radio-quiet PG quasars and the radio-loud quasars with steep radio spectral indices is produced by thermal processes.

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