Absorption Spectra of Q:0000-263 and 1442+101

Details Absorption Spectra of Q:0000-263 and 1442+101 Absorption Spectra of Q:0000-263 and 1442+101

Aug 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.263..575f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 263, NO. 3/AUG1, P. 575, 1993

Astronomy and Astrophysics

Astronomy

9

Scientific paper

We present a new analysis of the Ly α forest for the high-redshift QSOs 1442 + 101 (z = 3.544) and 0000 - 263 (z = 4.111). We have performed detailed profile fitting to spectra of moderate resolution and high signal-to-noise ratio. The results are compared to a more conventionally derived line list. As a result, we provide a high-redshift extension to the previously reported Ly α forest samples of Bajtlik, Duncan & Ostriker, Lu, Wolfe & Turnshek and Rauch et al. If the evolution of the number of lines per unit redshift has the functional form (1 + z)gamma^ then we find a best-fitting value of γ = 2.59 +/- 0.49 for an equivalent width completeness limit of W_thr_ = 0.21 A. If the equivalent widths are distributed as exp(-W/W^*^), we determine a characteristic equivalent width W^*^ = 0.084+/-0.008 for the new data. Relating this to a column density distribution of the form ρ(N_HI_) is proportional to N_HI_^-β^, we find that β ~ 1.9. The new data combined with the Rauch et al. sample give W^*^ = 0.179+/- 0.010, which corresponds to β = 1.7. Our values for W^*^ and β imply that the new data are not consistent with the typical intermediate-resolution sample. The larger values that we have determined for β are, however, consistent with high- resolution spectra.

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