Abell 2597和Sersic 159-03中暖分子气体的分布和条件
The Distribution and Condition of the Warm Molecular Gas in Abell 2597 and Sersic 159-03
摘要：
我们利用SINFONI积分场摄谱仪对两个冷核星系团Abell 2597和Sersic 159-03的近红外K波段分子氢和电离氢的发射谱线进行了测量。在最亮的星系团星系核外20 kpc处发现气体以团簇和细丝的形式分布在星系核周围，电离气体和分子气体在范围和动力学状态上相互密切跟踪。两种气相都显示出与活性核相互作用的迹象。在核区域内，这种气体的动力学光度被发现略小于目前的射电光度。在核区域之外，气体具有低速弥散，并显示出平滑的速度梯度。分子和电离气体发射的强度与无线电或X射线发射之间没有很强的相关性。Abell 2597和Sersic 159-03中的分子气体可以很好地用一个处于局部热平衡（LTE）的气体来描述，其单一激发温度T_exc约为2300 K。的发射线的比率不强烈变化的功能的位置，与例外的核区域的电离分子气体的比例被发现减少。这些恒定的线比意味着两个气相的加热和激发的单一来源。
英文摘要：
We have used the SINFONI integral field spectrograph to map the near-infrared K-band emission lines of molecular and ionised hydrogen in the central regions of two cool core galaxy clusters, Abell 2597 and Sersic 159-03. Gas is detected out to 20 kpc from the nuclei of the brightest cluster galaxies and found to be distributed in clumps and filaments around it. The ionised and molecular gas phases trace each other closely in extent and dynamical state. Both gas phases show signs of interaction with the active nucleus. Within the nuclear regions the kinetic luminosity of this gas is found to be somewhat smaller than the current radio luminosity. Outside the nuclear region the gas has a low velocity dispersion and shows smooth velocity gradients. There is no strong correlation between the intensity of the molecular and ionised gas emission and either the radio or X-ray emission. The molecular gas in Abell 2597 and Sersic 159-03 is well described by a gas in local thermal equilibrium (LTE) with a single excitation temperature T_exc ~ 2300 K. The emission line ratios do not vary strongly as function of position, with the exception of the nuclear regions where the ionised to molecular gas ratio is found decrease. These constant line ratios imply a single source of heating and excitation for both gas phases.
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