Quasars as probes of the intergalactic medium

Details Quasars as probes of the intergalactic medium Quasars as probes of the intergalactic medium

Jul 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984esasp.218..125g&link_type=abstract

In ESA Fourth European IUE Conf. p 125-128 (SEE N84-35135 24-88)

Physics

1

Intergalactic Media, Quasars, Spectral Energy Distribution, Ultraviolet Spectra, Interstellar Chemistry, Lyman Alpha Radiation, Red Shift, Stellar Luminosity

Scientific paper

Spectral energy distributions for 10 high red shift quasars in the wavelength range 1250 to 10,000 A were obtained by IUE. A pronounced steepening is detected shortward of 1200 A, which correlates well with quasar red shift, but poorly with luminosity. The observed slope change is explained by Lyman continuum absorption from the strongest 5% of the Lyman alpha forest lines, identified with the low column density metal containing systems. Reddening may also contribute to the steepening, but a much lower neutral gas to dust ratio than that found in the Galaxy is required. Optically thick Lyman limit discontinuities are seen with zabs zem. These systems are metal containing, constant in comoving density with epoch, and require in L* galaxy to have a cross section of 5 to 10 Holmberg radii.

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