论文标题
大规模普罗托达人的无线电连续体发射的多个上周期研究
A Multi-Epoch Study of Radio Continuum Emission from MassiveProtostars
论文作者
论文摘要
我们报告了Jansky非常大的阵列（JVLA）观察到6和22.2 GHz的五个巨大质子。该研究的目的是将其当前的通量和位置与以前的观察结果进行比较，以寻找可变性的证据。大多数观察到的来源都呈现热核的形态，托有原恒星，没有表现出适当的运动，并且相关的非热无线电裂片具有适当的运动，并且远离热芯。一些原始的protostar驱动喷气机的裂片具有不同的位移向量，这意味着喷气机的进攻或存在多个喷气驱动器。 The jets of the protostars were found to have proper motions that lie in the range 170$ \leq v \leq $650 kms$^{-1}$, and precessions of periods 40$\leq p \leq$50 years and angles 2$\leq α\leq$10$^\circ$, assuming that their velocities $v=$500 kms$^{-1}$.其中一种来源的核心是在观察时爆发中的S255 NIR 3，与其他来源相比，通量发生了显着变化。在爆发期间，其光谱指数降低，与膨胀气泡的模型一致。建模爆发的发射为新的非热叶的发射，该非热叶是从热核中浮出水面的，其发射叶的发射包含叶片的发射也有可能解释通量的增加和源爆发频谱频谱的减少。
We report the results of the Jansky Very Large Array (JVLA) observation of five massive protostars at 6 and 22.2 GHz. The aim of the study was to compare their current fluxes and positions with previous observations to search for evidence of variability. Most of the observed sources present the morphologies of a thermal core, hosting the protostar and exhibiting no proper motion, and associated non-thermal radio lobes that are characterised by proper motions and located away from the thermal core. Some of the protostars drive jets whose lobes have dissimilar displacement vectors, implying precession of the jets or the presence of multiple jet drivers. The jets of the protostars were found to have proper motions that lie in the range 170$ \leq v \leq $650 kms$^{-1}$, and precessions of periods 40$\leq p \leq$50 years and angles 2$\leq α\leq$10$^\circ$, assuming that their velocities $v=$500 kms$^{-1}$. The core of one of the sources, S255 NIRS 3, which was in outburst at the time of our observations, showed a significant change in flux compared to the other sources. Its spectral index decreased during the outburst, consistent with the model of an expanding gas bubble. Modelling the emission of the outburst as that of a new non-thermal lobe that is emerging from a thermal core whose emission enshrouds that of the lobe also has the potential to account for the increase in flux and a decrease in the spectral index of the source's outburst.
