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The Space distribution of the Lyman alpha clouds in the line of sight to the Z = 3.66 QSO 0055-269

Dec, 1994
39 pages
Published in:
  • Mon.Not.Roy.Astron.Soc. 273 (1995) 1016
e-Print:
DOI:
Report number:
  • ESO-1054
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Abstract: (arXiv)
The spectrum of the quasar Q0055-269 (z=3.66z=3.66) has been observed at the resolution of 14 km s−1^{-1} in the wavelength interval 4750--6300 \AA. We give a list of Lyman−α-\alpha lines and metal-line systems for which column densities and Doppler widths have been derived by a fitting procedure. The statistical distribution of the Doppler parameter for the Lyman−α-\alpha lines is peaked at b≃23b\simeq 23 km s−1^{-1}, with 13\% of lines with 15≤b≤2015\leq b\leq 20 km s−1^{-1}. The column density distribution of the Lyman−α-\alpha lines is described by a power-law with a break or cutoff at log⁡NHI≃14.5\log N_{HI} \simeq 14.5. A featureless power-law distribution is rejected with a probability of 99.9499.94\%. Significant clustering, with ξ≃1\xi \simeq 1 at Δv=100\Delta v=100 km s−1^{-1}, is detected only for lines with \log N_{HI}\magcir 13.8. In addition, two voids of size ∼2000\sim 2000 km s−1^{-1} are found in the spectrum with a random probability of 2×10−42\times 10^{-4}. {}From the proximity effect for lines in the interval log⁡NHI=13.3−14.2\log N_{HI}=13.3-14.2 it is possible to infer an UV ionizing background J=5×10−22J=5\times 10^{-22} ergs s−1^{-1} cm−2^{-2} Hz−1^{-1} sr−1^{-1}, within a factor of two from the integrated quasar contribution.
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