NOAO >   Observing Info >   Approved Programs >   2007A-0611

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Proposal Information for 2007A-0611


PI: Karen T. Lewis, NASA Goddard Space Flight Center, ktlewis@milkyway.gsfc.nasa.gov
Address: Astrophysical Science Division, Code 662, Greenbelt, MD 20771, USA

CoI: Richard Mushotzky, NASA Goddard Space Flight Center

Title: Spectroscopy of XMM Slew Survey Sources

Abstract: The XMM Slew Survey is a new all-sky X-ray survey that is sensitive in the hard band (2-10 keV) down to a flux of 10^-13 erg\;\rm s^-1 cm^-2 and is an order of magnitude fainter than any previous hard- band all-sky survey. As with all hard X-ray surveys, it will detect even heavily absorbed AGNs. But more importantly, the large area coverage make it possible to detected luminous and rare AGN that have low number densities. Thus the XMM Slew survey offers us a rare opportunity to gain an accurate census of the z~0.1-0.2 universe which has not been probed well either by deep X-ray surveys or pointed observations and previous shallow all-sky surveys. We propose for three nights each at the KPNO and CTIO 4m telescopes to obtain follow-up optical spectroscopy of these targets. Many of the counterparts are in fact fairly bright, 2MASS galaxies. Thus in addition to obtaining redshifts, we propose to get high S/N spectra so as to investigate the root cause for the lack of emission lines in ~40% of X-ray selected AGN.


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