Interpreting the convergence of Lyman series absorption lines

Details Interpreting the convergence of Lyman series absorption lines Interpreting the convergence of Lyman series absorption lines

Jul 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990nascp3084..353j&link_type=abstract

In NASA, Ames Research Center, The Interstellar Medium in External Galaxies: Summaries of Contributed Papers p 353-355 (SEE N91-

Physics

Absorption Spectra, Convergence, Lyman Spectra, Quasars, Damping, Hydrogen, Neutral Gases, Spectrum Analysis

Scientific paper

Spectra of quasars at high z often show absorption at the Lyman limit from intervening gas systems at intermediate z having N(H) approx. greater than 107 cm(-2). In some circumstances, N(H) can be determined by measuring the strength of the Lyman limit absorption or the damping wings of Lyman - alpha. With a spectrum taken at low wavelength resolution, say, lambda/delta lambda approx. 103, it is usually not possible to distinguish individual Lyman series lines near the limit, yet one can still discern how rapidly the average intensity drops off as the limit is approached from the long wavelength side. The purpose here is to point out the information which is available from measurements of this series convergence.

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