An archival study of IUE observations of low-redshift quasars

Details An archival study of IUE observations of low-redshift quasars An archival study of IUE observations of low-redshift quasars

May 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.226..485c&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 226, May 15, 1987, p. 485-492.

Astronomy and Astrophysics

Astronomy

13

Astronomical Spectroscopy, Quasars, Red Shift, Satellite Observation, Ultraviolet Astronomy, Emission Spectra, H Beta Line, Iue, Lyman Alpha Radiation, Seyfert Galaxies

Scientific paper

The emission-line and continuum characteristics of a sample of 18 low-redshift quasars from the IUE archives are presented. The spectral index (Fν ∝ ν-α) is found to have a mean value of 1.10±0.11, which is considerably steeper than the index of the same spectral region for high-redshift objects. The line ratios Lα/Hβ and C IV/Lα for the sample, 10.0±2.1 and 0.50±0.04, respectively, are consistent with the value of the photoionization models of Kwan & Krolik. When the low-redshift sample is extended with Seyfert galaxies, intermediate-redshift quasars and high-redshift quasars, the equivalent width of both Lα and C IV anticorrelates with the luminosity at 1450 Å. The slope of the anticorrelation is seen to be steeper for the higher redshift samples than for the low-redshift samples.

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