NOAO >   Observing Info >   Approved Programs >   2007B-0390

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Proposal Information for 2007B-0390


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 4\times10^-12 \;\rm erg\; s^-1 cm^-2 and is an order of magnitude more sensitive than any previous hard-band all-sky X-ray survey. As with all hard X-ray surveys, it will detect even heavily absorbed AGNs. But more importantly, the large area coverage makes it possible to detect 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 all-sky surveys. We were awarded three nights each at CTIO and KPNO in semester A to perform follow-up optical spectroscopy of these targets; here we request three additional nights at each facility to complete observations of the sample which is distributed across the entire sky. 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 relationship between X-ray and optical emission-line properties and in particular explore the root cause for the possible lack of emission lines in ~40% of X-ray selected AGN.


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