Abstract
This paper presents a study of the environments of SDSS Quasi-Stellar-Objects
(QSOs) in the Spitzer Extragalactic Representative Volume Survey (SERVS). We
concentrate on the high-redshift QSOs as these have not been studied in large
numbers with data of this depth before. We use the IRAC 3.6-4.5\mum colour of
objects and ancillary r-band data to filter out as much foreground
contamination as possible. This technique allows us to find a significant (>
4-\sigma) over-density of galaxies around QSOs in a redshift bin centred on z
~ 2.0 and a (> 2-\sigma) over-density of galaxies around QSOs in a redshift
bin centred on z ~ 3.3. We compare our findings to the predictions of a
semi-analytic galaxy formation model, based on the ŁambdaCDM millennium
simulation, and find for both redshift bins that the model predictions match
well the source-density we have measured from the SERVS data.
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