NOAO >   Observing Info >   Approved Programs >   2006B-0199

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Proposal Information for 2006B-0199


PI: Ioannis Georgantopoulos, National Observatory of Athens, ig@astro.noa.gr
Address: Institute of Astronomy & Astrophysics, I. Metaxa \& V. Pavlou, Palaia Penteli, Athens, Attica 15236, Greece

CoI: Antonis Georgakakis, Imperial College, London, UK
CoI: Dimitris Athanasiadis, National Observatory Athens

Title: Selecting AGNs in the hardest possible X-ray band

Abstract: We propose to follow at near IR wavelengths a unique AGN sample selected at the hardest band currently accessible to X-ray imaging: 7.5- 12 keV. Selection at these ultra-hard energies extends the column density baseline directly accessible to observations by about 1 dex compared to previous efforts. This is a major step toward constraining the true underlying N_H distribution of AGN and refining current models. The proposed observations (R-K colours coupled with near-IR morphology) will shed light on the nature of these sources. A fraction of our sources do not have an optical counterpart down to B_j=20 while they are very bright in X-rays. For these we will be able to locate the optical counterparts paving the way for future near-IR spectroscopic observations.


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NOAO >   Observing Info >   Approved Programs >   2006B-0199

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