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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Suzaku metal abundance patterns in the outflow region of M82 and the importance of charge exchange
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Suzaku metal abundance patterns in the outflow region of M82 and the importance of charge exchange

机译：M82流出区域的朱雀金属丰度模式和电荷交换的重要性

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摘要

We performed spectral analysis of Suzaku data of the galactic disk and outflow regions of the starburst galaxy M82. Thermal modeling of the central disk regions requires at least three temperature components. The Lyβ line fluxes of OVIII and Ne X exceed those expected from a plasma in collisional ionization equilibrium. The ratios of the Lyβ/Lyα lines for OVIII and Ne X are higher than those of collisional ionization equilibrium, which may be caused by the process of charge exchange. In the outflow wind region, the spectra are well reproduced with two-temperature thermal models, and we have derived the metal abundances of O, Ne, Mg, and Fe in the outflow. The ratios of O=Fe, Ne=Fe, and Mg=Fe are about 2, 3, and 2, respectively, relative to the solar value determined by Lodders (2003, ApJ, 591, 1220). Since there is no evidence of charge exchange in the outflow region, the metal abundances should be more reliable than those in the central region. This abundance pattern indicates that starburst activity enriches the outflow through SN II metal ejection into intergalactic space.
机译：我们对银河盘的朱雀数据和星爆星系M82的流出区域进行了频谱分析。中央磁盘区域的热模型至少需要三个温度分量。 OVIII和Ne X的Lyβ线通量超过了碰撞电离平衡中等离子体的预期通量。 OVIII和Ne X的Lyβ/Lyα线的比率高于碰撞电离平衡的比率，这可能是由于电荷交换过程引起的。在出风区域，通过两温热模型可以很好地再现光谱，我们得出了出水中O，Ne，Mg和Fe的金属丰度。相对于Lodders（2003，ApJ，591，1220）确定的太阳值，O = Fe，Ne = Fe和Mg = Fe的比率分别约为2、3和2。由于没有证据表明流出区域有电荷交换，因此金属丰度应比中心区域的金属丰度更高。该丰度模式表明，爆炸爆发活动丰富了通过SN II金属喷射到星际空间的流出。

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