Multiwavelength studies of galaxy evolution

星系演化的多波长研究

• 批准号: 341847-2010
• 负责人: Webb, Tracy
• 金额: $ 2.33万
• 依托单位: McGill University
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2011
• 资助国家: 加拿大
• 起止时间: 2011-01-01 至 2012-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=482318
• 关键词: Multiwavelength; studies; galaxy; evolution

One of the most profound questions in science is: how did the rich and complex structure in the universe form and evolve from the exquisitely simple conditions following the Big Bang? Using state of the art facilities astronomers have pushed observations deep into the early universe in an attempt to clarify this process by tracing the evolution of galaxies with time. Success requires observations at a variety of wavelengths of light, from the ultraviolet to the radio, since different wavelengths are sensitive to different physical processes. The infrared and submillimeter wavelength regimes are particularly important as they sample the thermal emission from dust grains heated by the energy released from forming stars and accretion onto supermassive black holes; both of these processes are intimately tied to galaxy evolution and are often enshrouded in dust cocoons.

科学界最深刻的问题之一是：宇宙中丰富而复杂的结构是如何从大爆炸后极其简单的条件形成和演变的？天文学家利用最先进的设备将观测深入到早期宇宙，试图通过追踪星系随时间的演变来澄清这一过程。成功需要在各种波长的光上进行观测，从紫外线到无线电，因为不同的波长对不同的物理过程很敏感。红外线和亚毫米波长特别重要，因为它们采样了尘埃颗粒的热辐射，这些尘埃颗粒是由形成恒星和吸积到超大质量黑洞的能量所加热的；这两个过程都与星系演化密切相关，通常被尘埃茧所覆盖。