Astronomy & Astrophysics

All Figures

$\begin{figure} \par\includegraphics[angle=90,width=17cm]{Hh111_f1.ps} \end{figure}$ Figure 1: The WHT ISIS combined, normalised spectrum of the afterglow (midpt 0.14 days), and 1 $\sigma$ error spectrum (lower curve). Overlaid is the best-fitting DLA profile (solid line) and its errors (dashed lines). All significant lines (3 $\sigma$ ) are indicated above for z=3.969 (solid), z=3.565 (dashed), z=1.773 (dot-dashed) and unidentified (dotted) systems; see on-line table (Table 1) for details. Lines used in further analysis are labelled.
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In the text

$\begin{figure} \par\includegraphics[width=8cm]{Hh111_f2.eps} \end{figure}$ Figure 2: Evolution of the 0.3-10 keV count rate ( top), 0.2-10 keV power law slope, $\Gamma$ , ( middle, note that $\Gamma = 1 - \beta$ ) and additional equivalent hydrogen column, $N_{\rm H,int}$ , at the redshift of the host galaxy ( bottom) during the first $\sim$ 800 s of the Swift XRT observations (90% errors). The individual spectra are shown with filled circles; the two combined spectra pre- and post-500 s, for which better constraints are obtained, are shown with diamonds.
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In the text