The XMM-Newton Deep Survey of the Lockman Hole

Details The XMM-Newton Deep Survey of the Lockman Hole The XMM-Newton Deep Survey of the Lockman Hole

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.2617g&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #26.17; Bulletin of the American Astronomical Society, Vol. 32, p.1225

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The power of XMM-Newton for studies of the X-ray background and of the cosmological evolution of X-ray source populations is vividly demonstrated by the first deep survey performed in the Payload Verification phase. The Lockman Hole survey illustrates the advantages of the collecting area of XMM-Newton for the measurement of individual source spectra for fluxes as low as 10-14 cgs, sources at the detection limit of the Einstein deep surveys. The combined X-ray image from the three telescopes on board XMM-Newton shows the changing nature of the X-ray universe in going from the soft regime of Einstein and ROSAT to the wider and harder reach of the replicated mirrors. The extragalactic number counts, log(N)/log(S), have been accumulated in separate energy channels, 0.5 - 2 keV, 2 - 10 keV, and 5 - 10 keV. In the 2 - 10 keV band, the data clearly show a break to a flatter slope for source fluxes falling near or below 10-14 cgs. In the hard 5 - 10 keV band, the deviation from a Euclidean slope is not yet in evidence. Identifications in this field are already known, for many cases, from the optical follow-up to the ROSAT study of this region. Spectra of the individual brighter AGN and narrow-line galaxies show discrete features in some cases, interpreted as iron line emission. The low-energy spectral cut-offs for the NLG's show evidence of cold gas absorption through column densities in the range 3 x 1021 to 1023 cm-2. This work was supported by both ESA and NASA.

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