SXDF中z~1.4中等亮度活动星系核的黑洞与星系的协同演化
Black Hole and Galaxy Coevolution in Moderately Luminous Active Galactic Nuclei at z~1.4 in SXDF
摘要：
我们研究了斯巴鲁/XMM-Newton深场中中等亮度（$\log L_{\rm bol} \sim 44.5-46.5\ {\rm erg\ s^{-1}}$）、X射线选择的宽线活动星系核（AGN）中黑洞质量与宿主恒星质量的关系以及质量吸积率与恒星形成率（SFR）的关系。在斯巴鲁/XMM-Newton深场的$z=1.18-1.68$。用最新版本的星系核发射研究程序（{ \tt CIGALE}）模拟了85个活动星系核（AGN）的远红外-远紫外光谱能量分布，其中采用了活动星系核团簇环模型{ \tt SKIRTOR}。它们的宿主大多数被证实是主序星形成星系。我们发现，黑洞质量（$M_{\rm BH}$）与恒星总质量（$M_{\rm stellar}$）的平均比值为$\log M_{\rm BH}/M_{\rm stellar} = -2.2$，这与局域黑洞与核球质量的比值相似.这表明，如果$z\sim1.4$上这些中等亮度活动星系核的宿主星系是以凸起为主的，那么它们已经建立了局部黑洞质量-凸起质量关系;如果它们是以盘为主的，那么它们的黑洞相对于凸起质量过大。活动星系核的辐射热光度和SFR表现出良好的相关性，其比值高于从局部黑洞-凸起质量关系所预期的比值，这表明这些活动星系核处于SMBH-生长的主导阶段。
英文摘要：
We investigate the relation of black hole mass versus host stellar mass and that of mass accretion rate versus star formation rate (SFR) in moderately luminous ($\log L_{\rm bol} \sim 44.5-46.5\ {\rm erg\ s^{-1}}$), X-ray selected broad-line active galactic nuclei (AGNs) at $z=1.18-1.68$ in the Subaru/XMM-Newton Deep Field. The far-infrared to far-ultraviolet spectral energy distributions of 85 AGNs are reproduced with the latest version of Code Investigating GALaxy Emission ({\tt CIGALE}), where the AGN clumpy torus model {\tt SKIRTOR} is implemented. Most of their hosts are confirmed to be main-sequence star-forming galaxies. We find that the mean ratio of the black hole mass ($M_{\rm BH}$) to the total stellar mass ($M_{\rm stellar}$) is $\log M_{\rm BH}/M_{\rm stellar} = -2.2$, which is similar to the local black hole-to-bulge mass ratio. This suggests that if the host galaxies of these moderately luminous AGNs at $z\sim1.4$ are dominated by bulges, they already established the local black hole mass-bulge mass relation; if they are disk dominant, their black holes are overmassive relative to the bulges. AGN bolometric luminosities and SFR show a good correlation with ratios higher than that expected from the local black hole-to-bulge mass relation, suggesting that these AGNs are in a SMBH-growth dominant phase.
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