1.1 Active Galactic NucleiActive Galactic Nuclei (AGN) are centres of galaxies that are “active”.
Channel: Pritha
Date: 2023-10-28

1.1 Active Galactic Nuclei
Active Galactic Nuclei (AGN) are centres of galaxies that are “active”. The accretion of matter powers them onto a supermassive black hole (SMBH), and emits large amounts of energy across the electromagnetic spectrum. AGN can be observed across vast distances and provide astronomers with valuable information about the formation and evolution of galaxies. AGNs are classi- fied based on their observed properties, such as spectral lines, radio emission, and variability. The most common classification scheme is based on the pres- ence or absence of broad emission lines in their spectra. AGN with broad emission lines is called Type 1 AGN, while those without are called Type 2 AGN. Other types of AGN include radio-loud and radio-quiet AGN and low-ionization nuclear emission-line regions (LINERs