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arXiv 0708.4150astro-ph
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早期宇宙中致密射电源和喷流驱动的AGN反馈：来自积分场光谱学的约束

Compact radio sources and jet-driven AGN feedback in the early Universe: Constraints from integral-field spectroscopy

N. P. H. Nesvadba, M. D. Lehnert, C. De Breuck, A. Gilbert, W. van Breugel

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A&A accepted
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摘要：

为了研究射电喷流在大质量宿主星系形成时期的影响，我们对z=3.5的log（M_stel/ M_sun）~10.6和11.3的两个大质量致密射电星系TNJ 0205 +2242和TNJ 0121 +1320进行了分析。它们的小射电尺寸（R<= 10 kpc）很可能是年轻的标志。我们将它们的射电性质和气体动力学与高红移的扩展射电星系中的射电性质和气体动力学进行了比较，这显示出强有力的证据，证明了大量气体质量（M 10^9-10 M_sun）的强大喷流驱动外流。我们的分析结合了现有的无线电成像，CO发射线光谱，和静止帧紫外光谱的静止帧光学积分场光谱。[OIII]5007线发射在两个星系中都是紧凑的，并且位于射电瓣所定义的区域内。对于TNJ 0205 +2242，Ly-alpha剖面在喷流半径外显著变窄，表明存在静止晕。TNJ 0121 +1320有两个分量，它们之间的距离约为10 kpc，速度偏移约为300 km s^-1。如果运动是引力运动，这意味着质量更大的射电噪声分量的动力学质量为2 × 10^11 M_sun。动力学质量，分子气体质量测量CO线发射，和无线电光度这两个紧凑的射电星系意味着紧凑的无线电源可能会发展大规模的，充满活力的外流观察到在扩展的射电星系，与潜在的删除显着的部分ISM从宿主星系。在这些源中没有延伸到射电辐射之外的发光发射线气体，这与在扩展射电星系中观察到的时间尺度和流出率一致，并进一步证明在扩展射电源中观察到的高能大规模流出（Nesvadba et al. 2006）确实是射电喷流影响的结果。

英文摘要：

To investigate the impact of radio jets during the formation epoch of their massive host galaxies, we present an analysis of two massive, log(M_stel/ M_sun)~10.6 and 11.3, compact radio galaxies at z=3.5, TNJ0205+2242 and TNJ0121+1320. Their small radio sizes (R<= 10 kpc) are most likely a sign of youth. We compare their radio properties and gas dynamics with those in well extended radio galaxies at high redshift, which show strong evidence for powerful, jet-driven outflows of significant gas masses (M 10^9-10 M_sun). Our analysis combines rest-frame optical integral-field spectroscopy with existing radio imaging, CO emission line spectra, and rest-frame UV spectroscopy. [OIII]5007 line emission is compact in both galaxies and lies within the region defined by the radio lobes. For TNJ0205+2242, the Ly-alpha profile narrows significantly outside the jet radius, indicating the presence of a quiescent halo. TNJ0121+1320 has two components separated by ~10 kpc and a velocity offset of ~300 km s^-1. If motions are gravitational, this implies a dynamical mass of 2x10^11 M_sun for the more massive, radio-loud component. The dynamical mass, molecular gas mass measured from the CO line emission, and radio luminosity of these two compact radio galaxies imply that compact radio sources may well develop large-scale, energetic outflows as observed in extended radio galaxies, with the potential of removing significant fractions of the ISM from the host galaxy. The absence of luminous emission line gas extending beyond the radio emission in these sources agrees with the observed timescales and outflow rates in extended radio galaxies, and adds further evidence that the energetic, large-scale outflows observed in extended radio sources (Nesvadba et al. 2006) are indeed the result of influence of the radio jet.

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