标题： 对数(N)-对数(S)和HELLAS2XMM调查中源的宽带特性 显示英文标题

标题： The log(N)-log(S) and the Broadband Properties of the Sources in the HELLAS2XMM Survey

摘要： 我们展示了来自XMM-Newton偶然中等深度调查的首个结果，该调查覆盖了近三个平方度。 我们展示了0.5-2、2-10和5-10 keV波段的log(N)-log(S)分布，这些分布与以前的测定结果以及XRB模型的预测相符。 在软波段中，我们在通量约为5x10^-15 cgs处检测到一个转折点。 在更硬的波段中，我们填补了更深层的钱德拉和XMM-Newton观测与较浅的BeppoSAX和ASCA调查之间中间通量的空白。 此外，我们还对源的宽波段特性进行了分析。 显示英文摘要

摘要： We present the first results from an XMM-Newton serendipitous medium-deep survey, which covers nearly three square degrees. We show the log(N)-log(S) distributions for the 0.5-2, 2-10 and 5-10 keV bands, which are found to be in good agreement with previous determinations and with the predictions of XRB models. In the soft band we detect a break at fluxes around 5x10^-15 cgs. In the harder bands, we fill in the gap at intermediate fluxes between deeper Chandra and XMM-Newton observations and shallower BeppoSAX and ASCA surveys. Moreover, we present an analysis of the broad-band properties of the sources.