X-ray Deep Surveys and Requirements on Optical Follow-Up
R. E. Griffiths^1
1 Carnegie Mellon University
We review the progress made over the past several years with the deep X-ray surveys performed with the Chandra X-ray Observatory and XMM-Newton, and in the optical identifications of the X-ray sources. The evolution of X-ray selected AGN is compared with results from the surveys at visible wavelengths. The X-ray surveys have clearly demonstrated luminosity-dependent density evolution. At the faint end of the X-ray number counts, normal galaxy populations become increasingly important and it is shown that normal galaxies dominate the number counts at fluxes below the CXO limit for detection of individual sources. The potential application of SALT imaging and spectroscopy to these surveys will be summarised, followed by the requirements on future large telescopes and their instrumentation.

---

File translated from T_EX by T_TH, version 3.33.
On 20 Oct 2005, 17:41.