同步辐射在M_（87）中红外光谱中的作用
The role of the synchrotron component in the mid infrared spectrum of M 87
摘要：
我们详细研究了M 87在5 - 20微米范围内的中红外Spitzer-IRS光谱。由于斯皮策IRS光谱的高灵敏度，我们可以解开这个活跃星系的恒星和核成分。为此，我们从M 87光谱中适当地减去了来自我们样本中被动室女座星系的基本恒星连续体的贡献。残差是一个明确的幂律，没有任何额外的热成分，与零点一致的高空间分辨率，地面观测。残差与所采用的被动模板无关。这表明，M 87光谱中显示的10微米硅酸盐发射可以完全由底层的老恒星星族解释，几乎没有留下可能的环面贡献的空间。MIR幂律斜率α约为0.77-0.82（S $_ν\proptoν^{-α}$），与光学薄同步辐射一致。
英文摘要：
We study in detail the mid-infrared Spitzer-IRS spectrum of M 87 in the range 5 to 20 micron. Thanks to the high sensitivity of our Spitzer-IRS spectra we can disentangle the stellar and nuclear components of this active galaxy. To this end we have properly subtracted from the M 87 spectrum, the contribution of the underlying stellar continuum, derived from passive Virgo galaxies in our sample. The residual is a clear power-law, without any additional thermal component, with a zero point consistent with that obtained by high spatial resolution, ground based observations. The residual is independent of the adopted passive template. This indicates that the 10 micron silicate emission shown in spectra of M 87 can be entirely accounted for by the underlying old stellar population, leaving little room for a possible torus contribution. The MIR power-law has a slope alpha ~ 0.77-0.82 (S$_ν\proptoν^{-α}$), consistent with optically thin synchrotron emission.
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