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{KEY PROGRAMME PROPOSAL : High redshift quasars[\version-date]}
{KEY PROGRAMME PROPOSAL : High redshift quasars[\version-date]}
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{\large\it VISTA SCIENCE COMMITTEE  : KEY PROGRAMME PROPOSAL \\ 

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\LARGE\bf Addendum: Very high redshift quasars with VISTA\rm \\ 
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{\bf Date } : August 2000  \\

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{\bf SUMMARY}


This is an addendum that contains some plots done subsequent to
the discovery of the SDSS 1044 with z=5.8(Fan etal, 2000;
astro-ph/0005247]. The plots include:

\begin{itemize}

\item r$-$z v z$-$-K to be viewed in conjunction with the r$-$z v z$-$J plot
in the original proposal. z$-$K is used instead of z$-$J since K band
photometry exists for some SDSS QSOs. Only 2 are plotted at the moment.

\item various colour-colour combinations that relate to z$>$7
QSO selection. e.g. i band drop-outs using iz[J,H,K], z band droputs
using z,J[H,K]. In the case of zJ[H,K], L and T dwarfs will
contaminate the QSO sample. 


\item expected surface densities for H and K band limited surveys. The fiducial
horizontal line is drawn at 0.01deg$^{-2}$. 1 per 500deg$^2$ is probably a
more abitious target with a goal of finding 10 in 10,000deg$^2$.


\end{itemize}



{\bf Except where explicitly mentioned all quoted magnitudes
are on a Vega based normalisation.}

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\begin{figure}
\hspace*{1.0cm}{\psfig{file=lf_J_4-7_H_ssg.ps,width=12cm}} 
\hspace*{1.0cm}{\psfig{file=lf_J_4-7_H_who.ps,width=12cm}}
\caption{
The predicted number of quasars per square degree as a function of apparent 
H magnitude is shown for the two luminosity functions in figure 1.  
The horizontal line indicates a fiducial surface density of 1 quasar
per 100 deg$^2$. The upper plot is for SSG and the lower plot is for
WHO}

\end{figure}




\begin{figure}
\hspace*{1.0cm}{\psfig{file=lf_J_4-7_K_ssg.ps,width=12cm}} 
\hspace*{1.0cm}{\psfig{file=lf_J_4-7_K_who.ps,width=12cm}}
\caption{
The predicted number of quasars per square degree as a function of apparent 
H magnitude is shown for the two luminosity functions in figure 1.  
The horizontal line indicates a fiducial surface density of 1 quasar
per 100 deg$^2$.}

\end{figure}




\begin{figure}
\centerline{\hspace*{-2cm}\psfig{file=rzk.ps,width=15cm}} 
\caption{
Theoretical r-z, z-J colour-colour diagrams.  
The crosses are colours for stars calculated using the Gunn \& Stryker(1991) stellar atlas with the
Persson extension into the IR(from SYNPHOT in STSDAS). The filled
circles are quasar
colours that have been simulated using the monte-carlo approach
described above for two different continuum spectral indices
-0.50 and -0.75. The solid wobbly line is quasar colours calculated using
the analytic IGM model proposed by
Madau 1995. The differences between the two approaches are beyond
the scope of this study. The solid line near the top shows the effect
of underlying spectral index on colours. Yes, we could also add a reddening
vector. The 'stars' are the SDSS L and T dwarfs. The triangles are the
z=5.8 SDSS QSO and another z=5.2 QSO with rizJK photometry. The z=5.8 QSO
does not have J band photometry so it is only plotted on the plots
with  K.}
\end{figure}




\begin{figure}
\centerline{\hspace*{-2cm}\psfig{file=izk.ps,width=15cm}} 
\caption{izK}
\end{figure}



\begin{figure}
\centerline{\hspace*{-2cm}\psfig{file=izj.ps,width=15cm}} 
\caption{izJ}
\end{figure}



\begin{figure}
\centerline{\hspace*{-2cm}\psfig{file=zjh.ps,width=15cm}} 
\caption{zJH}
\end{figure}






\begin{figure}
\centerline{\hspace*{-2cm}\psfig{file=zjk.ps,width=15cm}} 
\caption{zJK}
\end{figure}





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