AGN

銀河の中には、中心領域が銀河全体と比べて非常に明るいものがあります。この中心部分は「活動銀河核」（Active Galactic Nuclei、略してAGN）と呼ばれています。AGNから放射される電磁波は様々な波長で観測されます。

AGNは銀河の星形成活動の制御等、銀河進化を議論する際には重要な役割を担っています。

Some galaxies have a central region that is very luminous compared to the rest of the galaxy. This central region is called an “Active Galactic Nuclei”, or AGN for short. Emissions from AGNs can be observed in a wide range of wavebands.

AGNs are considered to play a large role in the evolution of its host galaxy. For example, the energy release that occurs when material accretes onto an AGN, known as feedback, can cause the quenching of star formation, making AGNs a regulator of star formation activity of its host.