Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-10-12
Astronomy and Astrophysics
Astrophysics
4 pages. To appear in conference proceedings "Studying Galaxy Evolution with Spitzer and Herschel"
Scientific paper
We discuss preliminary results from our programme to map the fields of high-redshift AGN. In the context of the hierarchical models such fields are predicted to contain an over-density of young, luminous galaxies destined to evolve into the core of a rich cluster by the present epoch. We have thus imaged from submillimetre to X-ray wavelengths the few-arcmin scale fields of a small sample of high-redshift QSOs. We find that submillimetre wavelength data from SCUBA show striking over-densities of luminous star-forming galaxies over scales of ~500 kpc. Whilst many of these galaxies are undetected even in deep near-IR imaging almost all of them are detected by Spitzer at 4.5, 8.0 and 24 um, showing that they have extremely red colours. However, they are not detected in our XMM-Newton observations suggesting that any AGN must be highly obscured. Optical-through-mid-IR SEDs show the redshifted 1.6 um bump from star-light giving preliminary evidence that the galaxies lie at the same redshift, and thus in the same structure, as the QSO although this finding must be confirmed with photometric and/or spectroscopic redshifts.
Carrera Francicso J.
Ivison Rob J.
Page Mat J.
Smail Ian
Stevens Jason A.
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