Tracing the ejecta from cosmic nucleosynthesis
arxiv(2024)
摘要
Long-lived radioactive by-products of nucleosynthesis provide an opportunity
to trace the flow of ejecta away from its sources for times beyond where ejecta
can be seen otherwise. Gamma rays from such radioactive decay in interstellar
space can be measured with space-borne telescopes. A prominent useful example
is 26Al with a radioactive decay time of one My. Such observations have
revealed that typical surroundings of massive stars are composed of large
cavities, extending to kpc sizes. Implications are that material recycling into
new stars is twofold: rather direct as parental clouds are hosts to new star
formation triggered by feedback, and more indirect as these large cavities
merge with ambient interstellar gas after some delay. Kinematic measurements of
hot interstellar gas carrying such ejecta promises important measurements
complementing stellar and dense gas kinematics.
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