IJAA  Vol.4 No.3 , September 2014
Optical Luminosity Function of the QSOs Observed with the Sloan Digital Sky Survey Data Release Seven (SDSS DR7)
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 range  0.3 < z < 2.5 and absolute magnitude Mi < -22.5. The Monte Carlo Technique of numerical integration is used. The sample of QSOs is divided into seven sub-samples with redshift in the ranges: 0.30 < z < 0.55, 0.55 < z < 0.80, 0.8055 < z < 1.05, 1.05 < z < 1.30, 1.30 < z < 1.55 , 1.55 < z < 1.80, and 1.80 < z < 2.05. Each redshift interval is binned in absolute magnitude with bin width 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.


Cite this paper
Singh, S. , Meitei, I. and Singh, K. (2014) Optical Luminosity Function of the QSOs Observed with the Sloan Digital Sky Survey Data Release Seven (SDSS DR7). International Journal of Astronomy and Astrophysics, 4, 474-478. doi: 10.4236/ijaa.2014.43043.
References
[1]   Kembhavi, A.K. and Narlikar, J.V. (1999) Quasars and Active Galactic Nuclei. Cambridge University Press, Cambridge. http://dx.doi.org/10.1017/CBO9781139174404

[2]   Meitei, I.A. and Singh, K.Y. (2013) The Evolution QSOs—The Optical Luminosity Function. International Journal of Astronomy and Astrophysics, 3, 87-92. http://dx.doi.org/10.4236/ijaa.2013.32009

[3]   Osmer, P. (2006) Quasistellar Objects: Overview from Encyclopedia of Astronomy and Astrophysics. P. Murdin. IOP Publishing Ltd., London.

[4]   Croom, S.M., et al. (2009) The 2dF-SDSS LRG and QSO Survey: The QSO Luminosity Function at 0.4 < z < 2.6. Monthly Notices of the Royal Astronomical Society, 399, 1755-1772.
http://dx.doi.org/10.1111/j.1365-2966.2009.15398.x

[5]   Fontanot, F., et al. (2006) The Luminosity Function of High-Redshift Quasi-Stellar Objects. A combined Analysis of GOODS and SDSS. Astronomy & Astrophysics, 461, 39-48.
http://dx.doi.org/10.1051/0004-6361:20066073

[6]   York, D.G., et al. (2000) The Sloan Digital Sky Survey: Technical Summary. The Astronomical Journal, 120, 1579-1587. http://dx.doi.org/10.1086/301513

[7]   Abazajian, K.N., et al. (2009) The Seventh Data Release of the Sloan Digital Sky Survey. The Astrophysical Journal Supplement Series, 182, 543-558.
http://dx.doi.org/10.1088/0067-0049/182/2/543

[8]   O’Mill, A.L., et al. (2010) Photometric Redshift and K-Correction for Sloan Digital Sky Survey Seven Data Release. Monthly Notices of the Royal Astronomical Society, 1-14.

[9]   Schneider, D.P., et al. (2010) The Sloan Digital Sky Survey Quasar Catalog V. Seven Data Release. arXiv:1004.1167v1 [astro-ph.CO].

[10]   Page, M.J. and Carrera, F.J. (2000) An Improved Method of Constructing Binned Luminosity Functions. Monthly Notices of the Royal Astronomical Society, 311, 433-440. http://dx.doi.org/10.1046/j.1365-8711.2000.03105.x

 
 
Top