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has been cited by the following article:

• TITLE: Optical Luminosity Function of the QSOs Observed with the Sloan Digital Sky Survey Data Release Seven (SDSS DR7)

  AUTHORS: Salam Ajitkumar Singh, Irom Ablu Meitei, Kangujam Yugindro Singh

  KEYWORDS: Quasi Stellar Objects (QSOs), Luminosity Function

  JOURNAL NAME: International Journal of Astronomy and Astrophysics, Vol.4 No.3, August 19, 2014

  ABSTRACT: We have determined the Optical Luminosity Function (OLF) of a sample of 80946 Quasi Stellar Objects (QSOs) taken from the Sloan Digital Sky Survey Data Release Seven (SDSS DR7) with redshift range0.3 z Mi z z z z z z z ΔMi = -0.5. A flat universe with cosmological parameters Ωm = 0.3, Ω∧ = 0.7, and Hubble constant Ho = 70.0 km·s-1·Mpc-1 is used. From the optical luminosity function a clear evidence of AGN downsizing is observed, i.e. the number density of the less luminous AGNs peaks at lower redshift than the number density of the more luminous AGNs.