Luminosity function of quasars in the early universe (IMAGE)

Ehime University

Luminosity function of quasars in the early universe

Caption

Luminosity function describes the space density (Φ on the vertical axis) as a function of radiation energy (M1450 on the horizontal axis). We plot the luminosity functions of quasars observed when the age of the universe was 0.8 (red dots), 0.9 (green diamonds), 1.2 (blue squares), and 1.5 (black triangles) billion years. The curves represent the best-fit functional forms. The space density of quasars rose steeply over time, while the shape of the luminosity function remains almost unchanged.

Credit

The Astrophysical Journal Letters, 949, L42, 2023

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