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The Origins and Physical Properties of the Complex of Local Interstellar Clouds

机译：局部星际云复合体的起源和物理性质

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The Complex of Local Interstellar Clouds (CLIC) is a relatively tight grouping of low density, warm, partially ionized clouds within about 30 pc of the Solar System. The Local Interstellar Cloud (LIC) is the cloud observed on most lines of sight and may be the cloud that immediately surrounds our Solar System, the properties of which set the outer boundary conditions of the heliosphere. Using absorption line data toward nearby stars, in situ observations of inflowing interstellar gas from spacecraft in the Solar System, and theoretical modeling of the interstellar radiation field and radiative transfer, we can deduce many characteristics of the LIC. We find that the LIC is partially ionized with modest electron density, n (e) a parts per thousand 0.07 cm(-3). The combination of its temperature and ionization favor photoionization/thermal equilibrium over a non-equilibrium cooling cloud picture. The abundances in the LIC suggest moderate dust destruction for silicate dust but complete destruction of carbonaceous grains. An origin for the LIC as a density enhancement in the ambient medium that has been overrun by a shock seems likely, while its velocity away from the Sco-Cen association points to a possible connection to that region and the Loop I bubble.
机译：局部星际云复合体（CLIC）是在太阳系大约30％之内相对密集的低密度，温暖，部分电离的云。局部星际云（LIC）是在大多数视线中观察到的云，并且可能是紧紧围绕着我们太阳系的云，其性质决定了太阳圈的外边界条件。利用对附近恒星的吸收线数据，从太阳系中航天器流入的星际气体的原位观测以及星际辐射场和辐射传递的理论模型，我们可以得出LIC的许多特征。我们发现LIC被适度的电子密度部分电离，n（e）为千分之0.07 cm（-3）。与非平衡冷却云图相比，其温度和电离的组合有利于光电离/热平衡。 LIC中的丰度表明，硅酸盐粉尘的破坏程度中等，而碳质颗粒的破坏则完全。 LIC的起源似乎是由于周围介质中的密度增加而受到冲击的影响，而LIC远离Sco-Cen关联的速度表明可能与该区域和Loop I气泡有关。

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