![\begin{figure}
\par\includegraphics[width=7.7cm,clip]{Gj011_fig3.eps}
\end{figure}](/articles/aa/full/2005/05/aagj011/Timg27.gif) |
Figure 3:
A fit of both one- and two-component models to the profile of the
Ly
line. a) The two dimensional spectrum centered on the Ly line. In this unrectified spectrum, the night sky emission lines are
not removed. The pixel scale for this image is
0
252 pix-1 in the spatial direction and
0.86 Å pix-1 in the dispersion direction. b) Observed
Ly line ( histograms) with the three best-fitting models.
For clarity, the models are offset by 3 erg s-1 cm-2 Å-1. The
two-component models consist of a two components: a broad, truncated
Gaussian and a narrower redshifted Gaussian. The one-component model
consists of only a broad, truncated Gaussian. See Table 1 for the parameters of the "broad'' (
solid), "spiky'' ( dotted) and "single component'' (
dashed) models. c) Same model line profiles as in b) but
before convolution with the instrument profile. d) Observed data
minus model fit (as plotted in b)) residuals, demonstrating a
random scatter about the zero flux line. Also shown (
histograms) is the 1 -error spectrum from the observed
data, which includes both sky- and Poisson noise. Note that the red
peak is not N V. At this redshift it would appear around
8334 Å. |