Gas kinematics in powerful radio galaxies at z ~ 2: Energy supply from star formation, AGN, and radio jets
Gas kinematics in powerful radio galaxies at z ~ 2: Energy supply from star formation, AGN, and radio jets
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DOI：
10.1051/0004-6361/201629357
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发表时间：
2016-10
影响因子：
6.5
通讯作者：
N. Nesvadba;G. Drouart;C. Breuck;P. Best;N. Seymour;J. Vernet
中科院分区：
文献类型：
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作者：
N. Nesvadba;G. Drouart;C. Breuck;P. Best;N. Seymour;J. Vernet
我们比较的动能和动量注入率从激烈的星星形成，热AGN辐射，射电喷流的动能和动量在24个强大的射电星系在z~2的温暖的电离气体中观察到的。这些星系是我们最好的候选者之一，在它们的活跃形成期即将结束时，强烈的星星形成，类星体活动和强大的射电喷流都共存。所有星系都有静止坐标系光学线发射的VLT/SINFONI成像光谱，显示出具有大速度偏移（高达1500 km/s）和线宽（通常为800-1000 km/s）的发射线区域，与非常湍流，经常流出的气体一致。作为HeRGE样本的一部分，他们还对Herschel/PACS和SPIRE获得的星星形成和类星体活动进行了FIR估计，这使我们能够测量大质量恒星形成AGN宿主星系在最快速形成阶段的三个主要反馈源中的每一个的相对能量和动量释放。我们发现，星星的形成福尔斯提供的能量和动量所需的动力观察到的气体运动的因素不足10-1000。这些星系核中被遮蔽的类星体在大约一半的样本中提供了足够的能量和动量，然而，只有当这些能量和动量相对有效地转移到气体中时。我们比较了理论和观测约束的效率，从喷流和AGN辐射的能量和动量转移，这主张无线电喷流是气体运动学的主要驱动器。
We compare the kinetic energy and momentum injection rates from intense star formation, bolometric AGN radiation, and radio jets with the kinetic energy and momentum observed in the warm ionized gas in 24 powerful radio galaxies at z~2. These galaxies are amongst our best candidates for being massive galaxies near the end of their active formation period, when intense star formation, quasar activity, and powerful radio jets all co-exist. All galaxies have VLT/SINFONI imaging spectroscopy of the rest-frame optical line emission, showing emission-line regions with large velocity offsets (up to 1500 km/s) and line widths (typically 800-1000 km/s) consistent with very turbulent, often outflowing gas. As part of the HeRGE sample, they also have FIR estimates of the star formation and quasar activity obtained with Herschel/PACS and SPIRE, which enables us to measure the relative energy and momentum release from each of the three main sources of feedback in massive, star-forming AGN host galaxies during their most rapid formation phase. We find that star formation falls short by factors 10-1000 of providing the energy and momentum necessary to power the observed gas kinematics. The obscured quasars in the nuclei of these galaxies provide enough energy and momentum in about half of the sample, however, only if these are transfered to the gas relatively efficiently. We compare with theoretical and observational constraints on the efficiency of the energy and momentum transfer from jet and AGN radiation, which advocates that the radio jet is the main driver of the gas kinematics.