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Star formation in the circumgalactic high-velocity cloud Complex H 环银河系高速云复合体H中的恒星形成
IF 14.1 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Pub Date : 2026-03-11 DOI: 10.1038/s41550-026-02814-9
Zhihong He, Wenkang Pang, Kun Wang, Yangping Luo, Qian Cui
The accretion of metal-poor gas sustains galactic star formation. In the Milky Way, this process is fuelled by high-velocity clouds (HVCs), but their fundamental properties have remained elusive in the absence of stellar tracers. Here we report a binary open cluster within HVC Complex H. With an age of 11.2 ± 0.6 Myr and a subsolar metallicity of (0.0{5}_{-0.02}^{+0.05}) Z⊙, the clusters provide a direct stellar distance anchor to the cloud at 13.8 ± 0.6 kpc. Their proper motions indicate that Complex H is on a prograde, south-to-north orbit through the outer Galactic disk. The resulting interaction produces a ‘slow–fast–slow’ velocity gradient, with the cloud’s outer layers decelerating as they merge into the disk. Orbit integration suggests that the clusters formed from an internal cloud–cloud collision. This triggering mechanism implies that other HVCs could similarly produce high-velocity stars. The scarcity of previous stellar detections in HVCs is explained by the rapid escape of young stars (<20 Myr), whereas CO non-detections may stem from weak emission due to low metallicity and gas dispersal. This work reveals that the circumgalactic medium can sustain star formation, offering a tangible laboratory to probe the physical conditions of accreting gas before it merges with the Galactic disk.
缺乏金属的气体的吸积维持了星系恒星的形成。在银河系中,这一过程是由高速云(hvc)推动的,但在没有恒星示踪剂的情况下,它们的基本特性仍然难以捉摸。我们在HVC复合体h内发现了一个双星疏散星团,年龄为11.2±0.6 Myr,亚太阳金属丰度为(0.0{5}_{-0.02}^{+0.05}) Z⊙,星团提供了一个直接的恒星距离锚点,为13.8±0.6 kpc。它们的正常运动表明复合体H在一个从南到北的顺行轨道上穿过银河系外盘。由此产生的相互作用产生了一个“慢-快-慢”的速度梯度,云的外层在并入圆盘时减速。轨道综合表明,这些星团是由内部云-云碰撞形成的。这一触发机制意味着,其他hvc也可能产生类似的高速恒星。以前在hvc中很少探测到恒星的原因是年轻恒星(<20 Myr)的快速逃逸,而CO的未探测可能是由于低金属丰度和气体分散造成的弱发射。这项工作揭示了环绕银河系的介质可以维持恒星的形成,提供了一个切实的实验室来探测吸积气体在与银河系盘合并之前的物理条件。
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引用次数: 0
Geology of Rimae Bode region as priority site candidate for China’s first crewed lunar mission Rimae Bode地区的地质是中国首次载人登月任务的优先候选地点
IF 14.1 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Pub Date : 2026-03-09 DOI: 10.1038/s41550-026-02790-0
Maosheng Yang  (杨茂升), Jun Huang  (黄俊), Wajiha Iqbal, Lukas Wueller, Carolyn H. van der Bogert, Harald Hiesinger, Sascha Mikolajewski, Minggang Xie  (谢明刚), Sen Hu  (胡森), Long Xiao  (肖龙)
Characterizing landing sites for future lunar crewed missions is key to maximizing the science output. Here we use orbital data to look at the equatorial Rimae Bode region, which is at the mare–highlands boundary and is a high-priority candidate for the upcoming Chinese crewed mission. We identify four distinct geological units: a dark mantle deposit; the Sinus Aestuum mare area; the Rimae Bode unit proper, formed by two distinct areas; and the highlands. The dark mantle deposit is pyroclastic material with relatively low albedo, whose thickness ranges from 77 m to 136 m. Sinus Aestuum is an ancient impact basin filled with low-Ti basaltic lavas with a maximum thickness of 193 m and with a 4-m-thick regolith mostly composed of local materials. Rima Bode I includes volcanic rilles that are potential sources for the basalts in Sinus Aestuum, as they share its spectral characteristics, whereas Rima Bode II exhibits high abundances of Th and Ti. Based on this information, we propose four prospective landing sites in the traversable areas, which provide a range of diverse geological samples, including volcanic debris, mare basalts, Copernicus crater ejecta and high-Th materials. Such a collection may provide insights into the geological evolution of the region and enhance our understanding of the lunar mantle composition and volcanic processes.
确定未来载人登月任务的着陆点特征是实现科学产出最大化的关键。在这里,我们使用轨道数据来观察赤道的Rimae Bode地区,该地区位于高原边界,是即将到来的中国载人飞行任务的高优先级候选者。我们确定了四个不同的地质单元:暗地幔矿床;主动脉窦区;Rimae Bode单元由两个不同的区域组成;还有高地。暗幔沉积物为火山碎屑物质,反照率较低,厚度为77 ~ 136 m。Aestuum是一个充满低钛玄武岩熔岩的古老撞击盆地,最大厚度为193 m,风化层厚度为4 m,主要由当地物质组成。Rima Bode I包含火山裂谷,这些裂谷是asestum中玄武岩的潜在来源,因为它们具有相同的光谱特征,而Rima Bode II则显示出高丰度的Th和Ti。基于这些信息,我们在可穿越区域提出了四个潜在的着陆点,这些着陆点提供了一系列不同的地质样本,包括火山碎屑、海玄武岩、哥白尼陨石坑喷出物和高th物质。这样的收集可以提供对该地区地质演化的见解,并增强我们对月球地幔组成和火山过程的理解。
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引用次数: 0
Cosmic CO and [C II] backgrounds and the fuelling of star formation over 12 Gyr 宇宙CO和[C II]背景和12gyr以上恒星形成的燃料
IF 14.1 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Pub Date : 2026-03-06 DOI: 10.1038/s41550-026-02798-6
Yi-Kuan Chiang
Molecular gas, modest in mass yet pivotal within the cosmic inventory, regulates baryon cycling as the immediate fuel for star formation. Across most of cosmic history, its reservoir has remained elusive, with only the tip of the iceberg revealed by luminous CO-emitting galaxies. Here we report the detection of the mean cosmic CO background across its rotational ladder at 7σ, together with ionized carbon ([C II]) at 3σ, over 0 < z < 4.2. This uses tomographic clustering of diffuse broadband intensities with reference galaxies, directly probing aggregate emission in the cosmic web. From CO(1–0) we infer the total molecular gas density, ({varOmega }_{{{rm{H}}}_{2}}), finding it about twice that resolved in galaxy surveys. The global depletion time is ~1 Gyr, shorter than the Hubble time, requiring sustained inflow. CO excitation is linked to star-formation surface density and, with depletion time, yields a super-linear Kennicutt–Schmidt law that appears universal. Together these results establish a global picture of galaxy growth fuelled by a larger, short-lived molecular reservoir. The CO and [C II] detections mark a turning point for line-intensity mapping, replacing forecasts with empirical line strengths and defining sensitivity requirements for upcoming three-dimensional experiments poised to open new windows on galaxy formation and cosmology.
分子气体虽然质量不大,但在宇宙中起着关键作用,它调节重子循环,作为恒星形成的直接燃料。在宇宙历史的大部分时间里,它的储藏库仍然是难以捉摸的,只有发光的co发射星系揭示了冰山一角。在这里,我们报告了在其旋转阶梯上探测到的平均宇宙CO背景在7σ,以及电离碳([C II])在3σ,大于0 < z < 4.2。它使用参考星系的漫射宽带强度的层析成像聚类,直接探测宇宙网中的聚集发射。从CO(1-0)我们推断出总分子气体密度,({varOmega }_{{{rm{H}}}_{2}}),发现它大约是星系调查中分辨率的两倍。全球耗竭时间为1gyr,比哈勃时间短,需要持续的流入。CO激发与恒星形成的表面密度有关,随着耗尽时间的推移,产生了一个似乎普遍存在的超线性kennicut - schmidt定律。总之,这些结果建立了一个更大的、寿命较短的分子储存库推动的星系增长的全球图景。CO和[C II]探测标志着线强度测绘的转折点,用经验线强度取代预测,并为即将到来的三维实验确定灵敏度要求,准备打开星系形成和宇宙学的新窗口。
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引用次数: 0
A broad perspective on Galactic life 对银河系生命的广阔视角
IF 14.1 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Pub Date : 2026-03-03 DOI: 10.1038/s41550-026-02803-y
Gibor Basri
One of the most active areas in current astrophysics is the search for clues to answering the ancient question: are we alone? This Perspective focuses on where most of the life in our Galaxy might reside over the very long haul, taking a freer viewpoint than is typical for astrobiology. The astrophysical discussion includes stellar numbers and longevity, planetary numbers and conditions, and the effects of stellar magnetic activity. I support the position that exoplanets in habitable zones around stars of between 0.5 and 0.8 solar masses might be the dominant habitats for surface life. However, the primary habitat in the Galaxy could easily be salty oceans under thick ice shells instead. These are probably much more numerous than planets with Earth-like conditions and have little dependence on stellar properties. In both cases, exoplanets of a few Earth masses are favoured for several reasons. These conclusions are based on terrestrial life, but there is no reason to think that nature is confined to that paradigm, so I discuss some other speculative possibilities. Finally, I suggest that the classical Drake equation should be made dynamic to reflect galactic evolution, and discuss the importance of survival times for life and civilizations.
当前天体物理学中最活跃的领域之一是寻找回答这个古老问题的线索:我们是孤独的吗?这一视角聚焦于我们银河系中大多数生命可能长期居住的地方,采取了比典型的天体生物学更自由的视角。天体物理学的讨论包括恒星的数量和寿命,行星的数量和条件,以及恒星磁活动的影响。我支持这样一种观点,即位于宜居带的系外行星,其恒星质量介于0.5到0.8太阳质量之间,可能是地表生命的主要栖息地。然而,银河系的主要栖息地很可能是厚厚的冰层下的咸水海洋。这些行星的数量可能比具有类地条件的行星要多得多,而且对恒星特性的依赖性很小。在这两种情况下,一些地球质量的系外行星受到青睐有几个原因。这些结论是基于地球上的生命,但没有理由认为自然界局限于这种范式,所以我讨论了其他一些推测的可能性。最后,我建议经典的德雷克方程应该是动态的,以反映银河系的演化,并讨论生存时间对生命和文明的重要性。
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引用次数: 0
Worlds between Earth and Neptune defy a simple story 地球和海王星之间的世界不符合一个简单的故事
IF 14.1 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Pub Date : 2026-03-03 DOI: 10.1038/s41550-026-02812-x
Caroline Morley
Spectra of temperate sub-Neptunes reveal strikingly different atmospheric chemistries, hinting at diverse origins and interiors.
温带亚海王星的光谱揭示了截然不同的大气化学成分,暗示了不同的起源和内部结构。
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引用次数: 0
Exascale computing to accelerate discoveries in astrophysics and space plasma physics 百亿亿次计算加速天体物理学和空间等离子体物理学的发现
IF 14.1 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Pub Date : 2026-03-03 DOI: 10.1038/s41550-026-02807-8
Nitin Shukla, Geray S. Karademir, Luciano Rezzolla, Fabio Bacchini, Stefano Truzzi, Andrea Mignone, Alessandro Romeo, Klaus Dolag, Luca Tornatore, Lubomir Riha, Giuliano Taffoni
From early particle calculations to today’s models, numerical simulations have reshaped the way physicists investigate the Universe. This overview examines how the next generation of high-performance computing systems — characterized by unprecedented scale and substantial technical complexity —will create opportunities for astronomical discovery, from plasma physics to cosmological structure formation.
从早期的粒子计算到今天的模型,数值模拟重塑了物理学家研究宇宙的方式。本文概述了下一代高性能计算系统——以前所未有的规模和巨大的技术复杂性为特征——将如何为天文发现创造机会,从等离子体物理学到宇宙结构的形成。
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引用次数: 0
An adolescent and near-resonant planetary system near the end of photoevaporation 靠近光蒸发末期的青春期近共振行星系统
IF 14.1 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Pub Date : 2026-02-27 DOI: 10.1038/s41550-026-02795-9
Mu-Tian Wang, Fei Dai, Hui-Gen Liu, Howard Chen, Zhecheng Hu, Erik Petigura, Steven Giacalone, Eve Lee, Max Goldberg, Adrien Leleu, Andrew W. Mann, Madyson G. Barber, Joshua N. Winn, Karen A. Collins, Cristilyn N. Watkins, Richard P. Schwarz, Howard M. Relles, Francis P. Wilkin, Enric Palle, Felipe Murgas, Avi Shporer, Ramotholo Sefako, Keith Horne, Hugh P. Osborn, Yann Alibert, Luca Fossati, Andrea Fortier, Sérgio Sousa, Alexis Brandeker, Pierre Maxted, Alexia Goldenberg
Young exoplanets provide vital insights into the early dynamical and atmospheric evolution of planetary systems. Many multi-planet systems younger than 100 Myr exhibit mean-motion resonances, probably established through convergent disk migration. Over time, however, these resonant chains are often disrupted, mirroring the Nice model proposed for the Solar System. Here we present a detailed characterization of the ~200-Myr-old TOI-2076 system, which contains four sub-Neptune planets between 1.4 and 3.5 Earth radii. We demonstrate that its planets are near to but not locked in mean-motion resonances, making the system dynamically fragile. The four planets have comparable core masses but display a monotonic increase in hydrogen and helium (H/He) envelope mass fractions (from stripped to 1%, 5% and 5%) with decreasing stellar insolation. This trend is consistent with atmospheric mass loss due to photoevaporation, which predicts that the envelopes of irradiated planets either erode completely or stabilize at a residual level of ~1% by mass within the first few hundred million years, with more distant, less-irradiated planets retaining most of their primordial envelopes. Additionally, previous detections of metastable helium outflows rule out a pure water-world scenario for the TOI-2076 planets. Our finding provides direct observational evidence that the dynamical and atmospheric reshaping of compact planetary systems begins early and offers an empirical anchor for models of their long-term evolution.
年轻的系外行星为了解行星系统的早期动力学和大气演化提供了重要的见解。许多年龄小于100迈的多行星系统表现出平均运动共振,可能是通过收敛盘迁移建立的。然而,随着时间的推移,这些共振链经常被破坏,这反映了尼斯提出的太阳系模型。在这里,我们详细描述了~200 myr -old TOI-2076系统,该系统包含四颗亚海王星行星,半径在1.4到3.5地球之间。我们证明它的行星接近但没有锁定在平均运动共振中,使系统动态脆弱。这四颗行星的核心质量相当,但随着恒星日晒的减少,氢和氦(H/He)包层质量分数单调增加(从剥离到1%、5%和5%)。这一趋势与光蒸发造成的大气质量损失是一致的。光蒸发预测,在最初的几亿年内,受辐射行星的包层要么被完全侵蚀,要么稳定在约1%的残余质量水平上,而距离更远、受辐射较少的行星保留了大部分原始包层。此外,之前对亚稳态氦流出物的探测排除了TOI-2076行星存在纯水世界的可能性。我们的发现提供了直接的观测证据,表明紧凑行星系统的动力和大气重塑开始得很早,并为它们的长期演化模型提供了经验基础。
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引用次数: 0
Galaxy and black hole co-evolution in dark matter haloes not captured by cosmological simulations 星系和黑洞在暗物质晕中的共同演化没有被宇宙学模拟捕捉到
IF 14.1 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Pub Date : 2026-02-25 DOI: 10.1038/s41550-026-02792-y
Hassen M. Yesuf, Connor Bottrell
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引用次数: 0
The prevalence of solar-like differential rotation in slowly rotating solar-type stars 在缓慢旋转的太阳型恒星中普遍存在类似太阳的微分旋转
IF 14.1 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Pub Date : 2026-02-25 DOI: 10.1038/s41550-026-02793-x
Hideyuki Hotta, Yoshiki Hatta
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引用次数: 0
Evidence for global-scale magnetically modified Rossby waves in the Sun 太阳中存在全球尺度磁场改变的罗斯比波的证据
IF 14.1 1区 物理与天体物理 Q1 ASTRONOMY & ASTROPHYSICS Pub Date : 2026-02-24 DOI: 10.1038/s41550-026-02794-w
Shravan Hanasoge, Christopher Hanson
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引用次数: 0
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Nature Astronomy
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