Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.230..481l&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 230, Feb. 15, 1988, p. 481-490.
Astronomy and Astrophysics
Astronomy
22
Absorption Spectra, Hydrogen Clouds, Lyman Alpha Radiation, Quasars, Cosmology, Line Spectra, Red Shift
Scientific paper
The intrinsic properties and the evolution with redshift of Lyman-α absorption line clouds is estimated by counting lines as a function of redshift. The authors simulate spectra, with and without photon counting noise, in order to see what biases there are in deriving cloud properties. The line samples and the line counts are biased by the crowding of the lines. The bias results in an underestimate of the evolutionary rate exponent γ. The authors believe that the actual value is at least as large as γ ≈ 2, and may be as large as γ ≈ 3. An exponential distribution exp (-W/W0*) of intrinsic line equivalent widths W produces an apparent plateau in the distribution of inferred column densities. Both the crowding bias and the noise enhance this redshift dependent plateau and results in an overestimate of the scale of the distribution W0*.
Jones Bernard J. T.
Liu Xiang D.
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