外部FUV照射在天体物理冰的存活中的作用
The role of external FUV irradiation in the survival of astrophysical ices in Elias 29
摘要：
在恒星形成区，天体物理冰的存活取决于温度、密度和辐射条件的适宜性。在本文中，星际辐射场（ISRF）的作用，冰在埃利亚斯29。该天体是$ρ$ Oph E分子云中最明亮的原恒星，周围环绕着许多距离仅几角分的年轻恒星天体。此外，另外两颗亮度BV星（S1和HD 147889）增强了Elias 29的外部辐射。本研究采用蒙特卡罗辐射转移程序RADMC-3D进行，假设内部和外部辐照。结果发现HD 147889在ISRF中占主导地位，而不是最近的原恒星，并且有助于将外部辐射增强到标准值的44倍。此外，在远红外光谱和近红外图像中也观察到了显著的效果。此外，挥发性化合物，如CO，O $_2$，N $_2$和CH $_4$的雪线位置被重新定义为包络线中的环形形态，具有低FUV通量（10 $^{-7}$ ergs cm $^{-2}$ s $^{-1}$）。在这种情况下，由于挥发性物质的氢化或氧化而形成的复杂分子预计会受到严重影响。
英文摘要：
The survival of astrophysical ices in the star-forming regions depends on the suitability of temperature, density and radiation conditions. In this paper, the role of Interstellar Radiation Field (ISRF) on ices in Elias 29 is addressed. This object is the most luminous protostar in $ρ$ Oph E molecular cloud, and is surrounded by many Young Stellar Objects distant only a few arcminutes. In addition, other two brightness BV stars (S1 and HD 147889) enhance the external irradiation in Elias 29. This study was carried out by using the Monte Carlo radiative transfer code RADMC-3D assuming an internal and external irradiation. As result, we found that HD 147889 dominates the ISRF, instead of the closest protostars, and contributes to enhance the external irradiation in 44 times the standard value. Furthermore, remarkable effects are observed in FIR spectrum, as well as in near-IR image. Additionally, the snowline positions of volatile compounds, such as CO, O$_2$, N$_2$ and CH$_4$ are redefined to a toroidal-shaped morphology in the envelope, with low FUV flux (10$^{-7}$ ergs cm$^{-2}$ s$^{-1}$). In such scenario, the formation of complex molecules as result of hydrogenation or oxygenation of volatile species are expected to be severely affected.
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