星系可穿越性：河外SETI的一个新概念

IF 1.7 4区物理与天体物理 Q3 ASTRONOMY & ASTROPHYSICS

International Journal of Astrobiology Pub Date : 2021-06-14 DOI:10.1017/S1473550421000252

B. Lacki

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引用次数: 1

摘要

银河系中的星际旅行通常被认为是一项漫长而危险的事业，但所有星系都如此危险吗？我引入了银河系可穿越性的概念来解决这个问题。恒星种群是可穿越性的一个因素，更高的恒星密度和速度分散有助于在星系中快速传播。星际介质（ISM）是另一个因素，因为气体、尘埃颗粒和宇宙射线都会对海星造成危害。我回顾了目前对不同类型星系中这些成分的理解，并得出结论，没有恒星形成的红色静止星系具有有利的可穿越性。紧凑的椭圆星系和球状星团可能是“超级可穿越的”，因为恒星紧密地聚集在一起，ISM危害最小。总的来说，如果ISM是星际旅行的主要障碍，那么随着气体分数和恒星形成的下降，星系的可穿越性会随着宇宙时间的推移而增加。可穿越性是搜寻地外智慧（SETI）的河外调查中的一个考虑因素。

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Galactic traversability: a new concept for extragalactic SETI

Interstellar travel in the Milky Way is commonly thought to be a long and dangerous enterprise, but are all galaxies so hazardous? I introduce the concept of galactic traversability to address this question. Stellar populations are one factor in traversability, with higher stellar densities and velocity dispersions aiding rapid spread across a galaxy. The interstellar medium (ISM) is another factor, as gas, dust grains and cosmic rays all pose hazards to starfarers. I review the current understanding of these components in different types of galaxies, and conclude that red quiescent galaxies without star formation have favourable traversability. Compact elliptical galaxies and globular clusters could be ‘super-traversable’, because stars are packed tightly together and there are minimal ISM hazards. Overall, if the ISM is the major hindrance to interstellar travel, galactic traversability increases with cosmic time as gas fractions and star formation decline. Traversability is a consideration in extragalactic surveys for the Search for Extraterrestrial Intelligence (SETI).

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来源期刊

International Journal of Astrobiology 地学天文-地球科学综合

CiteScore

3.70

自引率

11.80%

发文量

审稿时长

>12 weeks

期刊介绍： International Journal of Astrobiology is the peer-reviewed forum for practitioners in this exciting interdisciplinary field. Coverage includes cosmic prebiotic chemistry, planetary evolution, the search for planetary systems and habitable zones, extremophile biology and experimental simulation of extraterrestrial environments, Mars as an abode of life, life detection in our solar system and beyond, the search for extraterrestrial intelligence, the history of the science of astrobiology, as well as societal and educational aspects of astrobiology. Occasionally an issue of the journal is devoted to the keynote plenary research papers from an international meeting. A notable feature of the journal is the global distribution of its authors.