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arXiv 1801.01508astro-ph.GAastro-ph.CO
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在高红移下快速生长的半导体中快速生长的SMBH:ALMA揭示的主要合并的作用

Fast-growing SMBHs in Fast-growing Galaxies, at High Redshifts: the Role of Major Mergers as Revealed by ALMA

Benny Trakhtenbrot, Paulina Lira, Hagai Netzer, Claudia Cicone, Roberto Maiolino, Ohad Shemmer

摘要:

我们提出了一个长期的,多波长的项目,以了解最大质量的黑洞的最快增长的时代,通过使用40个发光类星体的样本在z~4.8。这些类星体具有相当一致的性质,具有典型的吸积速率和黑洞质量,L/L_Edd~0.7和M_BH~10^9 M_sol。该样品由先前Herschel/SPIRE探测到的“FIR-bright”源(SFR > 1000 Msol/yr)和“FIR-faint”源(Herschel叠加分析表明典型的SFR约为400 Msol/yr)组成。ALMA在[CII]λ157.74 μ m谱线发射和相邻的150 μ m静止坐标系中观测了其中的6个类星体,以研究尘埃冷ISM。ALMA探测到了伴星,光谱证实了三个源的亚毫米星系(SMG)-一个明亮的FIR和两个微弱的FIR。伴星与类星体宿主的距离约为14-45千秒差距,我们将它们解释为主要的星系相互作用。因此,我们的ALMA数据清楚地支持这样一种观点,即重大合并可能是SMBH快速早期增长的重要驱动力。然而,并非所有高SFR类星体宿主都伴随着相互作用的SMG,以及ALMA观察到的有序气体运动学,这一事实表明其他过程可能为这些系统提供燃料。因此,我们的分析表明,与早期和快速SMBH增长的宿主星系的性质和气体吸积机制的多样性。

英文摘要:

We present a long-term, multi-wavelength project to understand the epoch of fastest growth of the most massive black holes by using a sample of 40 luminous quasars at z~4.8. These quasars have rather uniform properties, with typical accretion rates and black hole masses of L/L_Edd~0.7 and M_BH~10^9 M_sol. The sample consists of "FIR-bright" sources with a previous Herschel/SPIRE detection, suggesting SFR > 1000 M_sol/yr, as well as of "FIR-faint" sources for which Herschel stacking analysis implies a typical SFR of ~400 M_sol/yr. Six of the quasars have been observed by ALMA in [CII]λ157.74 micron line emission and adjacent rest-frame 150 micron continuum, to study the dusty cold ISM. ALMA detected companion, spectroscopically confirmed sub-mm galaxies (SMGs) for three sources - one FIR-bright and two FIR-faint. The companions are separated by ~14-45 kpc from the quasar hosts, and we interpret them as major galaxy interactions. Our ALMA data therefore clearly support the idea that major mergers may be important drivers for rapid, early SMBH growth. However, the fact that not all high-SFR quasar hosts are accompanied by interacting SMGs, and their ordered gas kinematics observed by ALMA, suggest that other processes may be fueling these systems. Our analysis thus demonstrates the diversity of host galaxy properties and gas accretion mechanisms associated with early and rapid SMBH growth.

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