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The Extreme Universe with Tim Paglione

2025/2/11
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Tim Paglione: 伽马射线是宇宙中能量最高的光，需要极高能量的过程才能产生，例如超新星爆发或冲击波。这些冲击波会加速粒子到接近光速。当高能质子（宇宙射线）与星际介质中的其他质子碰撞时，会产生包括π介子在内的多种粒子，其中中性π介子会迅速衰变为两个伽马射线，这是我们观测到的伽马射线来源之一。μ子是一种寿命极短的粒子，按经典物理学理论，它们不应该能从大气层到达地球表面，但实际上它们可以，因为相对论效应导致它们的时间流逝速度变慢。我对这些高能现象非常感兴趣，特别是宇宙射线如何影响星系的演化。 Tim Paglione: 我利用费米伽马射线空间望远镜研究宇宙中的高能现象。费米望远镜在定位伽马射线源方面比以往的望远镜有很大改进，可以更精确地确定伽马射线的方向。通过叠加未被探测到的脉冲星的伽马射线信号，可以研究这些脉冲星作为伽马射线源的性质。我们发现，低自旋减速的脉冲星也可能是伽马射线源，这表明我们对脉冲星的伽马射线产生机制还了解不足。我对宇宙射线如何影响星系的演化非常感兴趣。

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What can gamma rays tell us about supernovae and galaxy formation? Neil deGrasse Tyson and co-host Chuck Nice sit down with astrophysicist Tim Paglione to explore high-energy cosmic phenomena, gamma rays, and the extreme events that create them.

NOTE: StarTalk+ Patrons can listen to this entire episode commercial-free here:https://startalkmedia.com/show/the-extreme-universe-with-tim-paglione/)

Thanks to our Patrons Alexander Storts, Chris Henderson, Micheal Mayo, Jose Lotzin, Rebecca Noland, Scientific Panda, Sander Bergheim, Aubrey Loftus, John Leon, Jaquelin Butkovic, Jesse McIntyre, Kelly Sheffield, Kaseim カセイム, Bradley Westbrook, Chris Rassette, Aquahood, BA_MPH_JD_PhD-aspirant, Ravenwingfeather, Kaity Sturgell, Norma Bazan, Mickey Brumfield, lamar Gibson, Bong Bong, Andrew Hayes, Billy Madison, Bruce Muller, parker martindale, James Pope, Carrie Williams, Robert Lester, Mike Bundy, and My Pug is a Bug for supporting us this week.

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