The UK ROSAT Deep Survey by McHardy, I, Jones, L, Merrifield, MR, Mason, K, Newsam, A, Abrahm, R, Dalton, G, Carrera, F, Smith, P, Rowan-Robinson, M, Wegner, G, Ponman, T, Lehto, H, Branduardi-Raymont, G, Luppino, G, Efstathiou, G, Allan, D, Quenby, J

“…We present a summary of the identification content of the UK ROSAT Deep Survey. The survey is based on a 115ksec PSPC observation and comprises a sample of 70 sources to a flux limit of 2 x 10(-15) ergs cm(-2) s(-1) (0.5-2 keV). …”

X-ray QSO evolution from a very deep ROSAT survey by Jones, L, McHardy, I, Merrifield, MR, Mason, K, Smith, P, Abraham, R, Branduardi-Raymont, G, Newsam, A, Dalton, G, Rowan-Robinson, M, Luppino, G

“…The survey, performed with the ROSAT PSPC, has 89% spectroscopic completeness. The QSO log(N)-log(S) relation is found to have a break to a flat slope at faint fluxes. …”

The origin of the cosmic soft X-ray background: optical identification of an extremely deep ROSAT survey by McHardy, I, Jones, L, Merrifield, MR, Mason, K, Newsam, A, Abraham, R, Dalton, G, Carrera, F, Smith, P, Rowan-Robinson, M, Wegner, G, Ponman, T, Lehto, H, Branduardi-Raymont, G, Luppino, G, Efstathiou, G, Allan, D, Quenby, J