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astro-ph1997
The X-ray background and the ROSAT Deep Surveys
Guenther Hasinger, Gianni Zamorani
In this article we review the measurements and understanding of the X-ray background (XRB), discovered by Giacconi and collaborators 35 years ago. We start from the early history a…
astro-ph1997
The ROSAT Deep Survey II. Optical identification, photomettry and spectra of sources in the Lockman field
Maarten Schmidt, Guenther Hasinger, James Gunn +7
The ROSAT Deep Survey includes a complete sample of 50 X-ray sources with fluxes in the keV band larger than 5.5 erg cm s in the Lockman field (H…