A direct measure of the Gunn-Peterson effect at Z = 3 - Limits on the baryon density of the intergalactic medium at high redshifts

Details A direct measure of the Gunn-Peterson effect at Z = 3 - Limits on the baryon density of the intergalactic medium at high redshifts A direct measure of the Gunn-Peterson effect at Z = 3 - Limits on the baryon density of the intergalactic medium at high redshifts

Oct 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...398l...9g&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 398, no. 1, p. L9-L12.

Astronomy and Astrophysics

Astrophysics

39

Absorption Spectra, Baryons, Intergalactic Media, Quasars, Red Shift, Astronomical Spectroscopy, Lyman Alpha Radiation

Scientific paper

A measure of the average depression between Lyman absorption lines in the spectrum of the quasar Q2126-158 (Zem = 3.27) is presented. Regions free of absorption lines, in the Ly-alpha forest of the quasar, are selected on the basis of high-resolution data. We have extended the wavelength interval from 7000 to 8500 A, by means of data taken at low resolution, to obtain a more reliable evaluation of the continuum shape redward of the Ly-alpha emission, and we describe the procedure adopted to define the continuum level. We obtain a best estimate of (tau = 0.013 +/- 0.026 at (z) = 3. Constraints on the baryon density of the intergalactic medium are discussed.

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