This image is an optical spectrum of a quasar at a redshift of z=0.76. This spectrum shows an obvious and bright broad emission line, which is one of the main characteristics of the AGNs.

A picture of our current understanding of the AGN phenomenon. The unified scheme states that the seemingly different kinds of AGN are intrinsically the same and that the observed properties only depend on orientation effects




Extragalactic Astrophysics and
Space Observations
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