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  • 活动星系核 - 维基百科，自由的百科全书
    活动星系核 （英語： Active galactic nucleus，缩写： AGN）是 星系 中心的一个紧密区域，至少在一部分--可能全部的 电磁波谱 上远比普通 光度 高，它的特征表明过高的光度不是由 恒星 产生的。
  • Active galactic nucleus - Wikipedia
    AGN are both compact and persistently extremely luminous Accretion can potentially give very efficient conversion of potential and kinetic energy to radiation, and a massive black hole has a high Eddington luminosity
  • 活动星系核_百度百科
    活跃星系核（active galactic nucleus，缩写为AGN）是河外天体中的一类中央核区活动性很强的系外星系的核心，可以定义为：其主要特征为核活动，是产生于恒星中热核反应以外的另一种能源，并在某些现象中有着相当的影响。
  • Active Galactic Nuclei - NASA
    What are Active Galactic Nuclei (AGN)? In some galaxies, known as "active galactic nuclei" (AGN), the nucleus (or central core) produces more radiation than the entire rest of the galaxy! Quasars are very distant AGN - the most distant quasars mark an epoch when the universe was less than a billion years old and a sixth of its current size
  • [1707. 07134] Active Galactic Nuclei: whats in a name? - arXiv. org
    Active Galactic Nuclei (AGN) are energetic astrophysical sources powered by accretion onto supermassive black holes in galaxies, and present unique observational signatures that cover the full electromagnetic spectrum over more than twenty orders of magnitude in frequency
  • What Are Active Galactic Nuclei? - Webb
    Active galactic nuclei are active supermassive black holes that emit bright jets and winds, and shape their galaxies Based on extensive evidence, active galactic nuclei, also commonly referred to as AGN, are now understood to be active supermassive black holes at the center of galaxies that are emitting jets and winds
  • Fermi Gamma-ray Space Telescope: Exploring the Extreme Universe
    Active Galactic Nuclei (AGN) are galaxies with extremely bright centers, powered by accretion onto supermassive black holes (SMBH) Some of these black holes accelerate relativistic bipolar jets of ejected material to speeds near the speed of light, which stretch up to hundreds of kiloparsecs outside the host galaxies
  • 活动星系核 - 知乎
    一般认为，AGN的明亮辐射来源于星系中心的一个 超大质量黑洞 (SMBH)吸积周围的物质释放出的能量，对于一个 10^8 太阳质量的黑洞，每年吸积一到两个太阳质量的物质就足以产生这样明亮的辐射。
  • Active Galactic Nucleus - ESA Hubble
    An active galactic nucleus (AGN) is a small region at the centre of some galaxies that is far brighter than can be explained by the stellar population alone The extremely luminous central region is emitting so much radiation that it can outshine the rest of the galaxy altogether
  • Active Galactic Nuclei - Texas A M University
    When the supermassive black hole at the heart of a galaxy is actively accreting material, it is called an Active Galactic Nucleus (AGN) These are the most luminous permanent sources of energy in the cosmos





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