The L-alpha/H-alpha intensity ratio in PKS 0237-23

Details The L-alpha/H-alpha intensity ratio in PKS 0237-23 The L-alpha/H-alpha intensity ratio in PKS 0237-23

Mar 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...220l..73h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 220, Mar. 15, 1978, p. L73-L75.

Astronomy and Astrophysics

Astrophysics

43

H Alpha Line, Hydrogen Recombinations, Infrared Spectra, Lyman Alpha Radiation, Quasars, Astronomical Spectroscopy, H Beta Line, Light Curve, Red Shift, Resonance Scattering, Spectrum Analysis

Scientific paper

The ratio I(L-alpha)/I(H-alpha) has been measured to be 1.7 plus or minus 0.6 in the quasar PKS 0237-23. The measured ratio is similar to that measured in 3C 273 by Davidsen et al. and to that inferred by Baldwin from a study of a large number of quasars; it is a factor of 5 to 14 smaller than expected from recombination theory. If the L-alpha radiation is resonantly scattered and there are modest amounts of dust within the ionized region, the measured ratio may be interpreted in terms of recombination theory, with L-alpha being depleted by absorption by the dust.

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