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Título: | The U.K. Deep and Medium Surveys with Rosat: log N-Log S relation |
Autor: | Branduardi-Raymont, G.; Mason, Keith O.; Warwick, R. S.; Carrera, Francisco J. CSIC ORCID CVN ; Graffagnino, V. G.; Mittaz, J. P. D.; Puchnarewicz, E. M.; Smith, P. J.; Barber, C. R.; Pounds, K. A.; Stewart, G. C.; McHardy, I. M.; Jones, L. R.; Merrifield, M. R.; Fabian, Andrew C.; McMahon, Richard G.; Ward, M. J.; George, I. M.; Jones, M. H.; Lawrence, A.; Rowan-Robinson, M. | Palabras clave: | Galaxies: active X-ray general Diffuse radiation |
Fecha de publicación: | 1994 | Editor: | Royal Astronomical Society Oxford University Press |
Citación: | Monthly Notices of the Royal Astronomical Society 270(4): 947-957 (1994) | Resumen: | We have carried out a soft X-ray survey of the sky using the ROSAT Position Sensitive Proportional Counter (PSPC) in a region of very low Galactic column density (NH = 6–9 × 1019 cm–2). The data consist of a deep > 70 ks pointing (the Deep Survey) and six pointings at lower sensitivity (13–20 ks; the Medium Survey). We detect a total of 141 sources over the 0.9 deg2 of sky area used. The faintest source detected has a flux of 3.2 × 10–15 erg cm–2 s–1 (0.5–2.0 keV). We present the source number-flux distribution, and we compare it with the distributions constructed from other ROSAT observations and from surveys carried out with X-ray instruments operating at higher energies. We estimate the contribution of the resolved sources to the soft X-ray background by direct comparison of their integrated spectrum with that of the diffuse background: 44 per cent of the extragalactic X-ray background between 0.5 and 2.0 keV is resolved directly into discrete sources whose average spectrum is steeper than that of the background. Integration of our number-flux relation to infinite flux produces a background resolved fraction of 44±565 per cent (0.5–2.0 keV). Limits on the slope of the log N–log S curve at very faint fluxes are set by the measured value of the X-ray background. | Versión del editor: | https://doi.org/10.1093/mnras/270.4.947 | URI: | http://hdl.handle.net/10261/170160 | DOI: | 10.1093/mnras/270.4.947 | Identificadores: | doi: 10.1093/mnras/270.4.947 issn: 0035-8711 e-issn: 1365-2966 |
Aparece en las colecciones: | (IFCA) Artículos |
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