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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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Scientists Propose A New Model For The Orbital Evolution Of Giant Planets In The Solar System
2024-03-12
Giant planets Solar system Evolution Dissipation Naissance
Giant planets Solar system Evolution Dissipation NaissanceThe sun blows away the gas in the protoplanetary disk like a giant hair dryer. (Image source: Liu Beibei)The sun is the center of the entire solar system. The eight major planets each hold their own orbits and revolve around the sun in peace. But astronomers have been trying to answer a question: How did the orbits of planets in the solar system become what they are now?Researcher Liu Beibei from Zhejiang University and collaborators from the University of Bordeaux in France and Michigan State University in the U...
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