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FREE-FREE RADIO EMISSION FROM YOUNG STELLAR OBJECTS

机译:青年物体的免费无线电发射

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摘要

We calculate the centimeter wavelength free-free emission of the jets of young stellar objects (YSOs) with the X-wind model enhanced by a variety of physical processes. Using parameters characteristic of a Class Ⅰ YSO with a mass-loss rate of ~10~(-6) solar mass yr~(-1), we obtain a 3.6 cm map and a spectral index that compare well with high spatial resolution observations of L1551 IRS 5. Models with lower mass-loss rates, appropriate for Class Ⅱ YSOs with revealed optical jets, produce radio jets that are too weak to be detected at current sensitivity levels. In addition to demonstrating the consistency of the density distribution of the X-wind model with observations, we are able to obtain information on the processes that heat and ionize the inner jet, i.e., X-ray ionization and shock heating and ionization.
机译:我们通过各种物理过程增强的X风模型计算了年轻恒星物体(YSO)射流的厘米波长自由发射。利用质量损失率为〜10〜(-6)太阳质量yr〜(-1)的Ⅰ类YSO的参数,我们获得了一个3.6 cm的图谱和一个光谱指数,与高空间分辨率的观测值相比较L1551 IRS 5.具有较低质量损失率的模型,适用于具有显露光射流的Ⅱ类YSO,其无线电射流太弱,无法在当前灵敏度水平下检测到。除了通过观察证明X风模型的密度分布的一致性外,我们还可以获得有关加热和电离内部射流的过程的信息,即X射线电离,激波加热和电离。

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