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Astron. Astrophys. 345, 73-80 (1999)

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3. Data

In the following analysis we use spectra of QSO J 2233-606 obtained with different instruments and telescopes. Table 1 gives the instrumentation, wavelength coverage, spectral resolution, typical signal-to-noise ratio and reference for the data available. Ultra-violet and optical spectra were taken by the HST HDF-S STIS Team (Ferguson 1998) with the STIS E230M, G140L, G230L and G430M gratings on board the Hubble Space Telescope. Optical data was obtained at the AAT and ESO/NTT by Outram et al. (1998) and Savaglio (1998) respectively. We have corrected the data for fluctuations in the zero-level by fitting low order polynomials to the bottom of the strong saturated Ly[FORMULA] lines. The echelle data have been smoothed using a gaussian filter of width 3 pixels. The continuum was fit with low-order polynomials and the spectrum was normalized.


Table 1. Spectroscopic data
a Ferguson (1998),
b Outram et al. (1998),
c Savaglio (1998)

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© European Southern Observatory (ESO) 1999

Online publication: April 12, 1999