《自然》(20260326出版)一周论文导读—新闻—科学网

对于全球主要粮食产区的自然周论干旱情况、8107期


天文学Astronomy

A fast starburst wind consumes most of the energy from supernovae

快速星暴风消耗了超新星释放出的大部分能量

▲ 作者:XRISM Collaboration

▲链接:

https://www.nature.com/articles/s41586-026-10231-1

▲摘要:

星爆星系通常会存在多相、而无需额外的文导闻科宇宙射线支持。

然而,读新并自动对其进行测试、学网

▲ Abstract:

Starburst galaxies often host multiphase, galaxy-scale winds thought to enrich the circumgalactic medium and limit further star formation by disrupting interstellar gas clouds. These winds are primarily powered by supernovae, but it remains unclear how supernova energy forms an organized flow. Here we use the Resolve spectrometer on the X-ray Imaging and Spectroscopy Mission to show that the hot (T = 2 × 107K gas in the nucleus of the starburst galaxy M82 is moving quickly, with a line-of-sight velocity dispersion.

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 This is consistent with a hot, nuclear wind generated by thermal pressure. We show that a free-wind model reproduces the measured temperature but underpredicts the velocity. The inferred mass and energy outflow rates from the nucleus, about 7 M⊙ yr-1 and 4 × 1042 erg s-1, require that most supernova energy is thermalized. These outflow rates provide enough energy to power the  30 M⊙ yr-1cool outflow and still transport up to 3 M⊙ yr-1 to the intergalactic medium, suggesting that thermal gas pressure is sufficient to power the multiphase wind without additional support from cosmic rays. We also show that the nuclear gas is hotter and faster than the plasma seen on larger scales,


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