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探秘“行星摇篮”：首张高清偏振照片揭示HL Tau原行星盘尘埃“厚”里藏玄机
2025-12-09
理解原行星盘——这颗“行星摇篮”的精细结构，是揭示行星形成奥秘的关键。在盘中，尘埃颗粒的垂直沉降是形成行星的第一步，但对其厚度（即尺度高度）在盘内不同区域的精确测量，一直是观测上的难题。近日，一项基于阿塔卡马大型毫米/亚毫米波阵列（ALMA）超高分辨率偏振观测的研究，首次成功绘制了著名原行星盘HL Tau中尘埃颗粒的径向尺度高度剖面，揭示了从内到外由“厚”变“薄”的惊人结构，为理解行星诞生地的物理环境提供了前所未有的清晰图景。该研究成果以《利用尘埃自散射探测的HL Tau盘中尘埃颗粒的详细径向尺度高度剖面》为题，于2025年8月20日发表于国际顶级天体物理期刊《天体物理学报快报》（ApJL 989, L43）。论文第一作者兼通讯作...
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Scholars from Zhejiang Universe capture the time evolution of galactic winds in the spectra of compact, star-forming galaxies, revealing the escape sequence of ionizing radiation thought to be responsible for the reionization of the early Universe.
2025-10-27
Unlike today, the early Universe was filled mostly with neutral hydrogen, formed from protons and electrons that combined shortly after the Big Bang. Observations of distant quasars reveal that most of this hydrogen was reionized within the first billion years—a period known as the Epoch of Reionization. Yet, the sources and evolution of reionization remain uncertain. Recent observations from the James Webb Space Telescope (JWST) suggest that the massive stars in early, compact galaxies produced enough ionizing photons to complete reionization. However, it remains unclear how many of thes...
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理解高红移超大质量黑洞的形成
2025-10-24
理解高红移超大质量黑洞（Supermassive Black Hole, SMBH）的形成是当前天体物理学中的核心科学问题之一。詹姆斯·韦布空间望远镜（JWST）的最新观测发现，大量红移 z>6 的明亮类星体，其中心黑洞质量已高达数十亿倍太阳质量，意味着这些黑洞在宇宙诞生不到十亿年时便已迅速成长。这一事实对现有的星系形成与黑洞增长模型提出了重大挑战。 近日，浙江大学天文学系吴子泳博士与岑人岳教授联合普林斯顿大学Romain Teyssier教授，利用高分辨率的宇宙学流体力学模拟，揭示了高红移典型晕环境中黑洞增长的全新图景。研究成果以题为《How Fast Could Supermassive Black Holes Grow At the Epoch of Reionization》的论文被国际著名天文学杂志Ap...
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PNAS|浙大学者提出巨型射电瓣对近邻星系气体吸积的重要影响
2025-09-22
理解星系形成是天体物理学的核心物理问题。星系中心的超大质量黑洞被认为是调节星系中恒星生长的主要动力因素。传统观点认为这种调节是局部的，只影响宿主星系。 浙江大学物理学院岑人岳教授团队于8月21日在美国科学院院刊（PNAS）上发表研究论文《Reduced gas accretion onto galaxies due to effects of external giant radio lobes》，展示超大质量黑洞释放的巨型射电瓣对气体吸积的抑制作用主要通过一种外部的、全域性的方式来实现 依托物理高等研究院宇宙学和计算天体物理中心“星河”超算平台，他们运用大规模宇宙学磁流体动力学模拟，发现巨型射电瓣附近的星系气体吸积质量显著减少，并由此抑制恒星的形成。物理上这种外部反...
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PNAS| Scholars from Zhejiang University proposed a new feedback mechanism for supermassive black holes
2024-08-21
Understanding galaxy formation is a core physics problem in astrophysics. Traditionally, it is believed that supermassive black holes at the center of galaxies suppress the overgrowth of galaxies by blowing away or heating gas that has already accreted into dark matter halos. However, Professor Renyue Cen from Zhejiang University proposed a novel external preventive feedback mechanism in his research paper Global preventive feedback of powerful radio jets on galaxy formation published in PNAS journal on August 19th, 2024.Figure 1: A black hole is emitting a powerful type FR II radio jet.Compar...
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A New Dark Matter Paradigm That Can Solve S8 Tension
2024-03-14
Dark matter is an important component of the universe, with a content about 5 times that of visible matter, accounting for 85% of the total matter in the universe. The formation of the structure of the universe strongly depends on the properties of dark matter, especially pressure and speed of sound.According to the pressure and speed of sound of dark matter, it can be divided into 'hot dark matter', 'warm dark matter', and 'cold dark matter'. Hot dark matter has higher pressure and velocity of sound, while cold dark matter has lower pressure and velocity of sound, whil...
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Progress In Research On The Formation Of Dark Matter Deficient Galaxies
2024-03-14
Dark matter deficient galaxies are a very unique type of galaxy discovered in recent years (van Dokkum et al. 2018), whose formation mechanism is unclear and poses a threat to the standard cosmological model, attracting widespread attention from astronomers. Recent studies have proposed possible mechanisms for its formation, such as galaxy collisions triggering the formation of dark matter deficient galaxies. Recently, a research team led by researcher Go Ogiya from the School of Physics at Zhejiang University discovered that the mechanism of galaxy collisions is also problematic, so the forma...
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The Detailed Process Of Galaxy Accretion And Extragalactic Gas Formation Into Stars
2024-03-14
The detailed process of galaxies accreting extragalactic gas and forming stars is a hot topic in astrophysics research. To unravel this mystery, an international team led by Professor Cai Zheng, including Professor RenYue Cen from Zhejiang University, collaborated to observe a massive gas nebula 11 billion years ago using the world's largest optical telescope, the Keck. Using an advanced imaging spectrometer, the Cosmic Web Imager, the team successfully detected hydrogen and various heavy element radiation in the surrounding gas of the galaxy and further estimated the large-scale spatial d...
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