591 citations · 2k across the 26 of their papers we have counts for
26 papers
The XMM-SSC survey of hard-spectrum XMM-Newton sources 1: optically bright sources
M. J. Page, I. Lehmann, Th. Boller +15
We present optical and X-ray data for a sample of serendipitous XMM-Newton sources that are selected to have 0.5-2 keV vs 2-4.5 keV X-ray hardness ratios which are harder than the…
The XMM-Newton wide-field survey in the COSMOS field: III. optical identification and multiwavelength properties of a large sample of X-ray selected sources
M. Brusa, G. Zamorani, A. Comastri +31
[ABRIGED] We present the optical identification of a sample of 695 X-ray sources detected in the first 1.3 deg^2 of the XMM-COSMOS survey, down to a 0.5-2 keV (2-10 keV) limiting f…
The XMM-Newton wide-field survey in the COSMOS field: I. Survey description
G. Hasinger, N. Cappelluti, H. Brunner +21
We present the first set of XMM-Newton EPIC observations in the 2 square degree COSMOS field. The strength of the COSMOS project is the unprecedented combination of a large solid a…
Mid-infrared Spitzer spectra of X-ray selected Type 2 QSOs: QSO2s are not ULIRGs
E. Sturm, G. Hasinger, I. Lehmann +5
We have performed a spectroscopic study of 7 Type 2 QSOs using the mid-infrared spectrometer IRS on board the Spitzer Space Telescope. These are (to our knowledge) the first mid-IR…
XMM-Newton observations of bright ROSAT selected active galactic nuclei with low intrinsic absorption
L. C. Gallo, I. Lehmann, W. Pietsch +4
We present a sample of twenty-one ROSAT bright active galactic nuclei (AGN), representing a range of spectral classes, and selected for follow-up snap-shot observations with XMM-Ne…
Chandra Observations of Six QSOs at z 3
Takamitsu Miyaji, Guenther Hasinger, Ingo Lehmann +1
We report the results of our Chandra observations of six QSOs at from the Palomer Transit Grism Survey. Our primary goal is to investigate the possible systematic change…