Table 3: Physical parameters of the $z_{\rm abs}$ = 1.7301 and 1.6131 metal absorbers towards HS 0747+4259 derived by the MCI procedure with the Haardt & Madau and modified UV background spectra (marked, respectively, by HM96 and S1 in Fig. 2). Column densities are given in cm-2.
  $z_{\rm abs}$ = 1.7301 $z_{\rm abs}$ = 1.6131
Parametera HM96 S1 HM96 S1
(1) (2) (3) (4) (5)
U0 1.0E-1 5.7E-2 $\ga$2.8E-1 $\ga$1.3E-1
$N_{\rm H}$ 1.9E20 9.5E19 5.7E19 2.5E19
$\sigma_{v}$, km s-1 24.9 24.5 26.4 24.5
$\sigma_{y}$ 0.72 0.68 0.53 0.64
$Z_{\rm C}$ 8.1E-7 1.6E-6 3.1E-6 6.1E-6
$Z_{\rm N}$ $\ldots$ $\ldots$ <2.0E-6 <4.8E-6
$Z_{\rm O}$ 2.8E-6 5.6E-6 1.8E-5 3.3E-5
$Z_{\rm Si}$ 1.4E-7 2.7E-7 $\ldots$ $\ldots$
$[Z_{\rm C}]$ -2.50 -2.18 -1.90 -1.60
$[Z_{\rm N}]$ $\ldots$ $\ldots$ <-1.5 <-1.1
$[Z_{\rm O}]$ -2.24 -1.94 -1.41 -1.17
$[Z_{\rm Si}]$ -2.37 -2.11 $\ldots$ $\ldots$
N(H  I) 1.9E16 $(1.9\pm0.4)$E16 7.3E14 $(7.2\pm2.0)$E14
N(C  III) 4.0E13 $(3.9\pm0.8)$E13 3.6E12 $(3.5\pm1.5)$E12
N(O  III) 1.3E14 $(1.3\pm0.4)$E14 3.9E13b 3.0E13b
N(Si  III) 1.7E12 $(1.7\pm0.2)$E12 $\ldots$ $\ldots$
N(C  IV) 3.1E13 $(3.10\pm0.15)$E13 1.2E13 $(1.1\pm0.1)$E13
N(O  IV) 2.3E14b 2.4E14b $\ldots$ $\ldots$
N(Si  IV) 9.0E11 $(8.3\pm3.0)$E11 $\ldots$ $\ldots$
N(N  V) $\ldots$ $\ldots$ <1.6E13 <1.6E13
N(O  VI) 2.8E13 $(4.0\pm1.0)$E13 1.3E14 $(1.30\pm0.25)$E14
$\langle T \rangle$, K 4.0E4 3.9E4 $\ga$4.7E4 $\ga$4.5E4
$n_{\rm H}$, cm-3 3.2E-4 5.6E-4 $\la$1.0E-4 $\la$2.4E-4
L, kpc 200 56 $\ga$190 $\ga$35
$^a\;Z_{\rm X} = N_{\rm X}/N_{\rm H}$; $[Z_{\rm X}] = \log~ (N_{\rm X}/N_{\rm H}) - \log~ (N_{\rm X}/N_{\rm H})_\odot$; b calculated using the corresponding velocity and density distributions estimated from the metal profiles marked by the horizontal bold lines in Figs. 3 and 4.

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