Searching for evidence of energetic feedback in distant galaxies: a galaxy wide outflow in a z ˜ 2 ultraluminous infrared galaxy
Searching for evidence of energetic feedback in distant galaxies: a galaxy wide outflow in a z ˜ 2 ultraluminous infrared galaxy
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寻找遥远星系中能量反馈的证据：z Ë 2 超亮红外星系中的星系范围外流
DOI：
10.1111/j.1365-2966.2009.16046.x
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发表时间：
2010
影响因子：
4.8
通讯作者：
Alexander D
中科院分区：
文献类型：
--
作者：
Alexander D
星系形成的主要模型需要大规模的能量外流来调节遥远星系及其中心黑洞的增长。然而，目前对高红移时这一假说的观测支持大多仅限于稀有星系。在这里，我们介绍了双子座-北近红外场光谱仪观测的[OIII]λ5007发射的az≈2超亮度红外星系(⊙；LIR>；1012L)，光学识别的活动星系核(AGN)。高速和宽广的[Oiii]发射的空间范围(≈4-8kpc)与在Z>；2射电星系中发现的一致，表明在可能比遥远的射电星系更常见的数量级的星系群中存在大规模的能量外流。这个系统的低射电光度表明，射电明亮的喷流不太可能是驱动外流的原因。然而，产生大尺度流出信号所需的估计能量输入(约为≈30Myr上的≈1059erg)可能是由活动星系核辐射驱动的风和/或来自强烈恒星形成的超新星风提供的。驱动外流所需的能量注入与星系球体的估计结合能相当，这表明它可能对星系的演化产生重大影响。我们认为，在这个系统中观测到的外流可能是高红移ULIRG群体中比较典型的，并讨论了这些观测结果对星系形成模型的影响。
Leading models of galaxy formation require large-scale energetic outflows to regulate the growth of distant galaxies and their central black holes. However, current observational support for this hypothesis at high redshift is mostly limited to rarez> 2 radio galaxies. Here, we present Gemini-North Near-Infrared Field Spectrometer (NIFS) observations of the [Oiii] λ5007 emission from az≈ 2 ultraluminous infrared galaxy (ULIRG;LIR> 1012L⊙) with an optically identified active galactic nuclei (AGN). The spatial extent (≈4–8 kpc) of the high velocity and broad [Oiii] emission is consistent with that found inz> 2 radio galaxies, indicating the presence of a large-scale energetic outflow in a galaxy population potentially orders of magnitude more common than distant radio galaxies. The low radio luminosity of this system indicates that radio-bright jets are unlikely to be responsible for driving the outflow. However, the estimated energy input required to produce the large-scale outflow signatures (of the order of ≈1059erg over ≈30 Myr) could be delivered by a wind radiatively driven by the AGN and/or supernovae winds from intense star formation. The energy injection required to drive the outflow is comparable to the estimated binding energy of the galaxy spheroid, suggesting that it can have a significant impact on the evolution of the galaxy. We argue that the outflow observed in this system is likely to be comparatively typical of the high-redshift ULIRG population and discuss the implications of these observations for galaxy formation models.