The UV spectra of intermediate redshift quasars

Details The UV spectra of intermediate redshift quasars The UV spectra of intermediate redshift quasars

Dec 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984nascp2349..133k&link_type=abstract

In NASA. Goddard Space Flight Center Future of Ultraviolet Astronomy Based on Six Years of IUE Res. p 133-134 (SEE N85-20961 1

Astronomy and Astrophysics

Astronomy

Line Spectra, Quasars, Red Shift, Ultraviolet Spectra, Heao 2, Iue, Ultraviolet Astronomy, X Ray Astronomy

Scientific paper

A sample of 21 intermediate redshift quasars were observed with the IUE in order to study their line and continuum properties. In addition, 18 of the quasars were observed by the Einstein observatory. These measurements allow study of the ionizing continuum and the anomalous Lalpha/H sub beta ratio in a well defined sample of quasars. The data also allow determination of the percentage of the quasar continuum that is covered by gas clouds. The main results are: (1) the mean UV slope for this sample is -0.99 + or - 0.11; (2) the mean slope from 1200 A to 2 keV is -1.45 + or - 0.03; (3) two thirds of the objects have UV slopes that extrapolate to more than two sigma above the X-ray flux; (4) for 11 objects, the mean Lalpha/H sub beta ratio is 8.3 + or - 1.4; and (5) the covering factor is estimated to be about 0.17.

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