标题： 钱德拉深空场-北调查。 XIV。 明亮亚毫米源天体群体中的X射线探测到的遮蔽活动星系核和星暴星系 显示英文标题

标题： The Chandra Deep Field-North Survey. XIV. X-ray detected Obscured AGNs and Starburst Galaxies in the Bright Submm Source Population

摘要： 我们提供了X射线约束，并对8.4'x8.4'区域内的明亮（f_850>=5mJy；S/N>=4）SCUBA源进行了首次X射线光谱分析，该区域包含2 Ms的钱德拉深空场-北调查中的哈勃深空场-北。在这个区域内，从10个明亮亚毫米源中检测到了7个X射线发射，对应于X射线检测的亚毫米源密度约为360 deg^-2（>~36%的明亮亚毫米源群体）。其中两个X射线检测到的源附近（3"以内）有X射线伴星，表明可能是合并/相互作用的源或引力透镜效应，另外三个位于一个原星系团候选体的大致范围之内。五个X射线检测到的源具有平坦的X射线光谱斜率，表明存在被遮挡的AGN活动。X射线光谱分析表明，这些AGN中的一个可能是康普顿厚源；其余4个AGN中，3个似乎为康普顿薄源，另一个的约束较差。这些AGN的静止框架未吸收X射线光度更符合 Seyfert 星系而非类星体。因此，中等深度X射线调查对明亮亚毫米源的低X射线检测率似乎是由于AGN的相对较低光度，而不是康普顿厚吸收。将这些源与研究充分的重遮挡AGN NGC6240进行比较显示，在亚毫米波长上AGN的平均贡献可以忽略不计。其他两个X射线检测到的源的X射线特性与高光度恒星形成预期的一致；然而，我们不能排除低光度AGN存在的可能性。三个未检测到X射线的源似乎位于高红移（z>4），可能是AGN或星暴星系。 显示英文摘要

摘要： We provide X-ray constraints and perform the first X-ray spectral analyses for bright (f_850>=5mJy; S/N>=4) SCUBA sources in an 8.4'x8.4' area of the 2 Ms Chandra Deep Field-North survey containing the Hubble Deep Field-North. X-ray emission is detected from 7 of the 10 bright submm sources in this region, corresponding to an X-ray detected submm source density of ~360 deg^-2 (>~36% of the bright submm source population). Two of the X-ray detected sources have nearby (within 3") X-ray companions, suggesting merging/interacting sources or gravitational lensing effects, and 3 lie within the approximate extent of a proto-cluster candidate. Five of the X-ray detected sources have flat X-ray spectral slopes, suggesting obscured AGN activity. X-ray spectral analyses suggest that one of these AGNs may be a Compton-thick source; of the other 4 AGNs, 3 appear to be Compton-thin sources and one has poor constraints. The rest-frame unabsorbed X-ray luminosities of these AGNs are more consistent with those of Seyfert galaxies than QSOs. Thus, the low X-ray detection rate of bright submm sources by moderately deep X-ray surveys appears to be due to the relatively low luminosities of the AGNs rather than Compton-thick absorption. A comparison of these sources to the well-studied heavily obscured AGN NGC6240 shows that the average AGN contribution is negligible at submm wavelengths. The X-ray properties of the other 2 X-ray detected sources are consistent with those expected from luminous star formation; however, we cannot rule out the possibility that low-luminosity AGNs are present. The 3 X-ray undetected sources appear to lie at high redshift (z>4) and could be either AGNs or starbust galaxies.