GOODS-Herschel：超深XMM-牛顿观测揭示了AGN/恒星形成的联系
GOODS-Herschel: Ultra-deep XMM-Newton observations reveal AGN/star-formation connection
摘要：
星系演化模型假设活动星系核和星系中恒星形成活动之间存在某种联系。我们使用CDFS的多波长信息来评估这个问题。我们选择的活动星系核从3 Ms XMM-牛顿巡天和测量恒星形成率的主机使用的数据，探测休息帧波长longward的20 μ m。恒星形成率是从光谱能量分布拟合，识别和减去活动星系核的组成部分。我们将恒星形成速率除以宿主恒星的质量，得到了比恒星形成速率（sSFR），并发现了活动星系核活动（以X射线光度为代表）与sSFR之间正相关的证据，对于X射线光度超过Lx=10^43 erg/s、红移z~1的最活跃的系统。我们没有找到证据表明这种相关性较低的光度系统或在较低的红移。我们也没有发现SFR（或sSFR）和来自高质量XMM-牛顿光谱的X射线吸收之间的任何相关性，这表明吸收可能与核区域而不是宿主有关，而恒星形成不是核。通过比较宿主星系的sSFR和相同红移下恒星形成星系的特征sSFR，我们发现活动星系核主要存在于主序星和星暴宿主星系中，反映了活动星系核与sSFR的联系。限制我们的分析，以最高的X射线光度活动星系核（Lx>10^44 erg/s的X射线类星体），我们发现，（z>2）主要存在于恒星爆发宿主中，平均sSFR是“主序星”的两倍多，我们发现了一些z~1.5的类星体，其特定的恒星形成率与主序星一致，或者甚至在“静止”区域中。（节略）
英文摘要：
Models of galaxy evolution assume some connection between the AGN and star formation activity in galaxies. We use the multi-wavelength information of the CDFS to assess this issue. We select the AGNs from the 3Ms XMM-Newton survey and measure the star-formation rates of their hosts using data that probe rest-frame wavelengths longward of 20 um. Star-formation rates are obtained from spectral energy distribution fits, identifying and subtracting an AGN component. We divide the star-formation rates by the stellar masses of the hosts to derive specific star-formation rates (sSFR) and find evidence for a positive correlation between the AGN activity (proxied by the X-ray luminosity) and the sSFR for the most active systems with X-ray luminosities exceeding Lx=10^43 erg/s and redshifts z~1. We do not find evidence for such a correlation for lower luminosity systems or those at lower redshifts. We do not find any correlation between the SFR (or the sSFR) and the X-ray absorption derived from high-quality XMM-Newton spectra either, showing that the absorption is likely to be linked to the nuclear region rather than the host, while the star-formation is not nuclear. Comparing the sSFR of the hosts to the characteristic sSFR of star-forming galaxies at the same redshift we find that the AGNs reside mostly in main-sequence and starburst hosts, reflecting the AGN - sSFR connection. Limiting our analysis to the highest X-ray luminosity AGNs (X-ray QSOs with Lx>10^44 erg/s), we find that the highest-redshift QSOs (with z>2) reside predominantly in starburst hosts, with an average sSFR more than double that of the "main sequence", and we find a few cases of QSOs at z~1.5 with specific star-formation rates compatible with the main-sequence, or even in the "quiescent" region. (abridged)
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