超大质量黑洞与超新星的「反馈」机制如何在星系演化中调节恒星形成？
How do feedback mechanisms from supermassive black holes and supernovae regulate star formation in galaxy evolution?
超新星爆发与活动星系核会把能量和金属物质以风与喷流形式注入星际介质，既能加热并驱散冷气体、抑制过度恒星形成，也能在局部压缩气体诱发新恒星。二者在质量—恒星质量关系等观测中留下的统计痕迹表明，反馈是解释为何大质量星系恒星形成早早熄火的关键负反馈回路。
Supernova explosions and active galactic nuclei inject energy and metals into the interstellar medium through winds and jets, heating and dispersing cold gas to suppress excessive star formation while occasionally compressing gas to trigger new stars. The statistical imprint of both, seen in relations such as the black hole mass–stellar mass correlation, shows that feedback is the key negative loop explaining why massive galaxies quenched star formation early.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Chaisson & McMillan,《Astronomy Today》Pearson 多版
E. Chaisson and S. McMillan, Astronomy Today, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 标识 /works/OL1919527W（按标识回读: Astronomy tod
#反馈 #活动星系核 #超新星 #星系演化
星系之间的并合如何驱动恒星形成的爆发？
How do galaxy mergers drive bursts of star formation?
当两个星系并合时，引力潮汐与动力学摩擦会把气体从盘面向中心输运并压缩，触发剧烈的云团坍缩与星暴。这种集中供料同时也会喂养中心黑洞，使活动星系核反馈在后期又把气体吹散、熄灭恒星形成，形成「并合—星暴—反馈熄灭」的演化序列。
During a galaxy merger, tidal forces and dynamical friction funnel and compress gas from the disk toward the center, triggering intense cloud collapse and a starburst. This concentrated fuel also feeds the central black hole, whose active galactic nucleus feedback later expels the gas and quenches star formation, forming an evolution sequence of merger, starburst, and feedback quenching.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 来源待核验 · Source pending review
来源 · Source
出处备注：著录仅给书名，无版次与年份；同一书名常对应多个版次，不臆测具体版本。
《天体物理学杂志》(ApJ)
The Astrophysical Journal (ApJ)
#星系并合 #星暴 #活动星系核反馈
为什么 21 厘米中性氢谱线被视为探测宇宙再电离时期的核心探针？
Why is the 21-centimeter neutral hydrogen line considered a key probe of the epoch of reionization?
中性氢基态的超精细跃迁发出波长 21 厘米（频率 1420 MHz）的辐射，其信号强度会随再电离进程中中性氢比例下降而衰减，并记录下中性气体温度与密度涨落。通过红移这一信号到低频射电波段，SKA、HERA 等望远镜能绘制再电离的时空演化图，这是目前唯一可在三维上直接追踪电离泡扩张的手段。
The hyperfine transition of neutral hydrogen ground state emits at 21 centimeters (1420 MHz); its signal weakens as the neutral fraction drops during reionization and encodes the temperature and density fluctuations of neutral gas. Redshifting this line into low-frequency radio bands, telescopes such as SKA and HERA can map the spatiotemporal evolution of reionization, the only method that directly tracks the growth of ionized bubbles in three dimensions.
难度 专业 · 适合 高中(15-18)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Chaisson & McMillan,《Astronomy Today》Pearson 多版
E. Chaisson and S. McMillan, Astronomy Today, Pearson, various editions
独立核验依据 · Independent verification: 核验依据 2 OPENLIBRARY 标识 标识 /works/OL1919527W（按标识回读: Astronomy tod
#21厘米线 #中性氢 #再电离 #SKA
类星体（quasar）本质上是什么天体？
What is a quasar essentially?
类星体是极其明亮的活跃星系核，中心是正在大量吸积物质的超大质量黑洞，吸积盘因摩擦升温到数百万开尔文而发出横跨电磁波段的光。它们在很远的距离仍能被观测到，因此是研究早期宇宙星系与黑洞共同演化的灯塔。
A quasar is an extremely luminous active galactic nucleus powered by a supermassive black hole rapidly accreting matter; the accretion disk heats by friction to millions of kelvin and shines across the electromagnetic spectrum. Visible even at great distances, quasars serve as beacons for studying the co-evolution of galaxies and black holes in the early Universe.
难度 进阶 · 适合 初中(12-15)
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#类星体 #超大质量黑洞 #吸积盘
宇宙大尺度结构中的「宇宙网」是什么？
What is the cosmic web in large-scale structure?
宇宙网是暗物质和星系在引力作用下形成的纤维状网络，由密集的纤维丝连接星系团，其间是几乎空旷的宇宙空洞。它是宇宙物质分布的基本形态，反映了早期密度涨落在数十亿年引力增长下的演化结果。
The cosmic web is the filamentary network formed by dark matter and galaxies under gravity, with dense filaments linking galaxy clusters and nearly empty cosmic voids between them. It is the fundamental shape of cosmic matter distribution, reflecting how early density fluctuations grew under gravity over billions of years.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#宇宙网 #暗物质 #宇宙空洞
为什么球状星团被称为研究星系形成的「化石记录」？
Why are globular clusters called fossil records of galaxy formation?
球状星团是由十万到百万颗老年恒星组成的致密球状系统，其恒星几乎同时诞生于星系形成的极早期，且化学丰度保留了当时原气体的成分。由于它们寿命极长且结构稳定，其年龄与金属丰度分布成为反推宿主星系组装历史的天然档案。
Globular clusters are dense spherical systems of a hundred thousand to a million old stars that formed almost simultaneously in the very early phase of galaxy formation, preserving the composition of the primordial gas in their chemical abundances. Because they are extremely long-lived and structurally stable, their ages and metallicity distributions serve as a natural archive for reconstructing the assembly history of their host galaxies.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#球状星团 #金属丰度 #星系形成
宇宙学中的「再电离」指的是什么过程？
What process does reionization refer to in cosmology?
再电离是指宇宙诞生数亿年后，第一代恒星和星系发出的紫外辐射把弥漫的中性氢重新电离成质子和电子的时期。它结束了宇宙的「黑暗时代」，使宇宙从对光不透明的迷雾变为透明的电离气体状态，这一过程约在红移 6–10 之间完成。
Reionization is the epoch, a few hundred million years after the Big Bang, when ultraviolet radiation from the first stars and galaxies reionized the pervasive neutral hydrogen into protons and electrons. It ended the cosmic dark ages, turning the Universe from an opaque fog into a transparent ionized medium, a process largely completed between redshifts of about 6 and 10.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#宇宙再电离 #中性氢 #黑暗时代
是什么天体结束了宇宙的「黑暗时代」？
What kinds of objects ended the cosmic dark ages?
宇宙在最初约四亿年缺乏发光天体、充满中性氢，被称为黑暗时代。结束它的主要是第一代恒星（星族 III）、早期星系与年轻的类星体，它们释放的紫外光子逐步电离周围气体，最终汇成全宇宙的再电离。
For the first roughly four hundred million years the Universe lacked luminous objects and was filled with neutral hydrogen, the so-called dark ages. They were ended chiefly by the first stars (Population III), early galaxies, and young quasars, whose ultraviolet photons progressively ionized the surrounding gas and eventually the whole cosmos.
难度 进阶 · 适合 大众
CC BY 4.0 · 已核验 · Verified 2026-08-23 · 2 条独立证据
来源 · Source
Carroll & Ostlie,《An Introduction to Modern Astrophysics》第2版,Cambridge University Press,2017
B. W. Carroll and D. A. Ostlie, An Introduction to Modern Astrophysics, 2nd ed., Cambridge University Press, 2017
独立核验依据 · Independent verification: 核验依据 2 ISBN 978-1-108-42216-1 (2nd ed., Cambridge Univ. Press)
#黑暗时代 #第一代恒星 #星族III