The different neighbours around Type-1 and Type-2 active galactic nuclei

@article{Villarroel2014TheDN,
  title={The different neighbours around Type-1 and Type-2 active galactic nuclei},
  author={Beatriz Villarroel and Andreas Korn},
  journal={Nature Physics},
  year={2014},
  volume={10},
  pages={417-420}
}
An active galactic nucleus is the brightest source of electromagnetic radiation in the Universe, believed to be powered by a supermassive black hole at its core. There are two main types of active galactic nuclei, though the differences may be down to varying viewing angles. Or are they? 
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