Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1982
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982mnras.200..271a&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 200, July 1982, p. 271-279.
Astronomy and Astrophysics
Astronomy
21
Balmer Series, H Alpha Line, Lyman Alpha Radiation, Quasars, Radiative Transfer, Red Shift, Astronomical Models, Spectrophotometry, Spectrum Analysis
Scientific paper
The H-alpha measurement of eight additional quasars with redshift values between 2.1 and 2.8 brings the total number of high redshift quasars with measured Lyman-alpha H-alpha ratios to 12, and yields a mean value for this ratio of 1.5 with a spread of values of a factor of about two on either side of the mean. No evidence is found for the evolution of the H-alpha equivalent width, or Lyman-alpha/H-alpha ratio, in comparison to low redshift quasars. Due to the probable enhancement of the Balmer lines, radiative transfer and collisional excitation and de-excitation effects appear to contribute to observed line ratios. A correlation is noted between the Lyman-alpha/H-alpha ratio and the continuum spectral index which matches a known correlation between the Lyman-alpha equivalent width and the spectral index. H-alpha intensity may consequently not depend on the optical spectral index of the ionizing source. Model explanations are given for the Lyman-alpha/H-alpha ratio.
Allen David A.
Barton John R.
Carswell Robert F.
Gillingham Peter R.
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