The IBEX ribbon as a signature of the inhomogeneity of the local interstellar medium

The IBEX ribbon as a signature of the inhomogeneity of the local interstellar medium
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IBEX 带作为局部星际介质不均匀性的标志

DOI:
10.1051/0004-6361/201322064
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发表时间:
2014
影响因子:
6.5
通讯作者:
David J.
David J.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
H. Fichtner;K. Scherer;F. Effenberger;J. Zønnchen;N. Schwadron;D. J. McComas;David J.

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目前IBEX宇宙飞船观测到的高能中性原子的全天通量图中出现了所谓的带状特征,提出了一个新的假设来解释这一特征,即带状是局部星际介质不均匀性的结果。本研究旨在详细介绍这一假设及其对IBEX解释ENA测量结果的影响。方法对高能中性原子相关的IBEX测量、低能中性原子相关的Lyman-α观测(由旅行者1号航天器完成)和星际介质结构相关的天文数据三个不同主题的理论考虑进行了批判性讨论,以证实这一假设。结果发现局部星际介质的不均匀性不仅可以解释IBEX带和外日球层Lyman-α的观测结果,而且还可以解释星际Lyman-α的吸收,如果日球弓形激波确实不存在,则星际Lyman-α吸收很难完全归因于外日鞘中的氢壁。IBEX对带的观测提供了一个独特的机会,可以更多地了解围绕日球层的星际介质的性质。
ContextA new hypothesis is offered to explain the so-called ribbon feature appearing in the all-sky flux maps of energetic neutral atoms presently observed with the IBEX spacecraft, namely that the ribbon is a consequence of inhomogeneities in the local interstellar medium.AimsThe study aims at a detailed presentation of this hypothesis and its implications for the interpretation of ENA measurements with IBEX.MethodsTheoretical considerations regarding three different topics, namely IBEX measurements related to high-energy neutral atoms, Lyman-αobservations (made with the Voyager 1 spacecraft) related to low-energy neutral atoms, and astronomical data related to the structure of the interstellar medium, are critically discussed in order to corroborate the hypothesis.ResultsIt is found that inhomogeneities in the local interstellar medium can explain not only the IBEX ribbon and outer heliospheric Lyman-αobservations, but can also account for the interstellar Lyman-αabsorption that could only with difficulty be fully attributed to the hydrogen wall in the outer heliosheath if the heliospheric bow shock would indeed be absent.ConclusionsThe IBEX observations of the ribbon provide a unique opportunity to learn more about the nature of the interstellar medium surrounding the heliosphere.
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发表时间: 2013
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