标题： XMM-Newton 13H深场 - I. X射线源 显示英文标题

标题： XMM-Newton 13H Deep field - I. X-ray sources

摘要： 我们展示了利用XMM-Newton在英国ROSAT 13H深场区域中心开展的一项深度X射线巡天的结果。 该区域覆盖了0.18平方度，并且是作为广泛多波段巡天的一部分，用XMM-Newton观测的两个区域中的第一个，旨在研究微弱X射线源的性质及其演化。 我们进行了详细的蒙特卡洛模拟，以定量表征源探测程序，并评估最终源列表的可靠性。 我们使用这些模拟来设定一个似然阈值，在此之上，我们期望少于7个（3%）的源是虚假的。 我们给出了最终包含225个源的目录。 在中心9角分范围内，68%的源位置精度达到2角秒，使得光学后续观测相对简单。 我们在四个能量带上构建了N(>S)关系：0.2-0.5 keV、0.5-2 keV、2-5 keV和5-10 keV。 除了我们最高的能量带外，我们发现源计数可以用双幂律表示，亮端斜率与欧几里得情况一致，并且在大约10^-14 cgs处有一个转折点。 在此通量以下，计数表现出平坦化。 在0.2-0.5 keV、0.5-2 keV、2-5 keV和5-10 keV能量带中，我们的源计数分别在4.1×10^-16、4.5×10^-16、1.1×10^-15和5.3×10^-15 cgs的通量下达到700、1300、900和300 deg^-2的密度。 我们将我们的源计数与两个Chandra深场以及Lockman洞的源计数进行了比较，发现我们的源计数在所有能量带中都是这些场中最密集的之一。 在1-2 keV（2-5 keV）能量带中，我们解析了超过51%（超过50%）的X射线背景辐射。 显示英文摘要

摘要： We present the results of a deep X-ray survey conducted with XMM-Newton, centred on the UK ROSAT 13H deep field area. This region covers 0.18 deg^2 and is the first of two areas covered with XMM-Newton as part of an extensive multi-wavelength survey designed to study the nature and evolution of the faint X-ray source population. We have produced detailed Monte-Carlo simulations to obtain a quantitative characterisation of the source detection procedure and to assess the reliability of the resultant sourcelist. We use the simulations to establish a likelihood threshold above which we expect less than 7 (3%) of our sources to be spurious. We present the final catalogue of 225 sources. Within the central 9 arcmin, 68 per cent of source positions are accurate to 2 arcsec, making optical follow-up relatively straightforward. We construct the N(>S) relation in four energy bands: 0.2-0.5 keV, 0.5-2 keV, 2-5 keV and 5-10 keV. In all but our highest energy band we find that the source counts can be represented by a double powerlaw with a bright end slope consistent with the Euclidean case and a break around 10^-14 cgs. Below this flux the counts exhibit a flattening. Our source counts reach densities of 700, 1300, 900 and 300 deg^-2 at fluxes of 4.1x10^-16, 4.5x10^-16, 1.1x10^-15 and 5.3x10^-15 cgs in the 0.2-0.5, 0.5-2, 2-5 and 5-10 keV energy bands respectively. We have compared our source counts with those in the two Chandra deep fields and Lockman hole and find our source counts to be amongst the highest of these fields in all energy bands. We resolve >51% (>50%) of the X-ray background emission in the 1-2 keV (2-5 keV) energy bands.