  We consider Erd\H{o}s-R\'{e}nyi graphs $G(n,p_n)$ with large constant
expected degree $\lambda$ and $p_n=\lambda/n$. Bordenave and Lelarge (2010)
showed that the infinite-volume limit, in the Benjamini-Schramm topology, is a
Galton-Watson tree with offspring distribution Pois($\lambda$) and the mean
spectrum at the root of this tree has unbounded support and corresponds to the
limiting spectral distribution of $G(n,p_n)$ as $n\to\infty$. We show that if
one weights the edges by $1/\sqrt{\lambda}$ and sends $\lambda\to\infty$, then
the support mostly vanishes and in fact, the limiting spectral distributions
converge weakly to a semicircle distribution. We also find that for large
$\lambda$, there is an orthonormal eigenvector basis of $G(n,p_n)$ such that
most of the vectors delocalize with respect to the infinity norm, as
$n\to\infty$. Our delocalization result provides a variant on a result of Tran,
Vu and Wang (2013).
