Optical Luminosity Function of Quasi Stellar Objects

Salam Ajitkumar Singh; Irom Ablu Meitei; Kangujam Yugindro Singh

doi:doi:10.11648/j.ajaa.20160406.12

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Optical Luminosity Function of Quasi Stellar Objects

Salam Ajitkumar Singh, Irom Ablu Meitei, Kangujam Yugindro Singh

Published in American Journal of Astronomy and Astrophysics (Volume 4, Issue 6)

Received: 29 October 2016 Accepted: 11 November 2016 Published: 8 December 2016

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Abstract

We study the shape of the optical luminosity function of Quasi Stellar Objects (QSOs) from the Sloan Digital Sky Survey Data Release Seven (SDSS DR7) over the redshift range 0.3 ≤ Z ≤ 2.4. By using the Levenberg-Marquardt method of nonlinear least square fit, the observed QSO luminosity function is fitted by a double power-law model with luminosity evolution characterized by a second order polynomial in redshift. For a flat universe with Ω_m=0.3 and Ω _Λ=0.7, we determine the best-fitting optical luminosity function model parameters.

Published in	American Journal of Astronomy and Astrophysics (Volume 4, Issue 6)
DOI	10.11648/j.ajaa.20160406.12
Page(s)	78-82
Creative Commons	This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited.
Copyright	Copyright © The Author(s), 2016. Published by Science Publishing Group

Keywords

Quasars: General, Quasars: Supermassive Black Holes, Galaxies: Luminosity Function

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APA Style

Salam Ajitkumar Singh, Irom Ablu Meitei, Kangujam Yugindro Singh. (2016). Optical Luminosity Function of Quasi Stellar Objects. American Journal of Astronomy and Astrophysics, 4(6), 78-82. https://doi.org/10.11648/j.ajaa.20160406.12

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ACS Style

Salam Ajitkumar Singh; Irom Ablu Meitei; Kangujam Yugindro Singh. Optical Luminosity Function of Quasi Stellar Objects. Am. J. Astron. Astrophys. 2016, 4(6), 78-82. doi: 10.11648/j.ajaa.20160406.12

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AMA Style

Salam Ajitkumar Singh, Irom Ablu Meitei, Kangujam Yugindro Singh. Optical Luminosity Function of Quasi Stellar Objects. Am J Astron Astrophys. 2016;4(6):78-82. doi: 10.11648/j.ajaa.20160406.12

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@article{10.11648/j.ajaa.20160406.12,
  author = {Salam Ajitkumar Singh and Irom Ablu Meitei and Kangujam Yugindro Singh},
  title = {Optical Luminosity Function of Quasi Stellar Objects},
  journal = {American Journal of Astronomy and Astrophysics},
  volume = {4},
  number = {6},
  pages = {78-82},
  doi = {10.11648/j.ajaa.20160406.12},
  url = {https://doi.org/10.11648/j.ajaa.20160406.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajaa.20160406.12},
  abstract = {We study the shape of the optical luminosity function of Quasi Stellar Objects (QSOs) from the Sloan Digital Sky Survey Data Release Seven (SDSS DR7) over the redshift range 0.3 ≤ Z ≤ 2.4. By using the Levenberg-Marquardt method of nonlinear least square fit, the observed QSO luminosity function is fitted by a double power-law model with luminosity evolution characterized by a second order polynomial in redshift. For a flat universe with Ωm=0.3 and Ω Λ=0.7, we determine the best-fitting optical luminosity function model parameters.},
 year = {2016}
}

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TY  - JOUR
T1  - Optical Luminosity Function of Quasi Stellar Objects
AU  - Salam Ajitkumar Singh
AU  - Irom Ablu Meitei
AU  - Kangujam Yugindro Singh
Y1  - 2016/12/08
PY  - 2016
N1  - https://doi.org/10.11648/j.ajaa.20160406.12
DO  - 10.11648/j.ajaa.20160406.12
T2  - American Journal of Astronomy and Astrophysics
JF  - American Journal of Astronomy and Astrophysics
JO  - American Journal of Astronomy and Astrophysics
SP  - 78
EP  - 82
PB  - Science Publishing Group
SN  - 2376-4686
UR  - https://doi.org/10.11648/j.ajaa.20160406.12
AB  - We study the shape of the optical luminosity function of Quasi Stellar Objects (QSOs) from the Sloan Digital Sky Survey Data Release Seven (SDSS DR7) over the redshift range 0.3 ≤ Z ≤ 2.4. By using the Levenberg-Marquardt method of nonlinear least square fit, the observed QSO luminosity function is fitted by a double power-law model with luminosity evolution characterized by a second order polynomial in redshift. For a flat universe with Ωm=0.3 and Ω Λ=0.7, we determine the best-fitting optical luminosity function model parameters.
VL  - 4
IS  - 6
ER  -

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Author Information

Salam Ajitkumar Singh

Department of Physics, Manipur University, Imphal, India
Irom Ablu Meitei

Department of Physics, Modern College, Imphal, India
Kangujam Yugindro Singh

Department of Physics, Manipur University, Imphal, India

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APA Style

Salam Ajitkumar Singh, Irom Ablu Meitei, Kangujam Yugindro Singh. (2016). Optical Luminosity Function of Quasi Stellar Objects. American Journal of Astronomy and Astrophysics, 4(6), 78-82. https://doi.org/10.11648/j.ajaa.20160406.12

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ACS Style

Salam Ajitkumar Singh; Irom Ablu Meitei; Kangujam Yugindro Singh. Optical Luminosity Function of Quasi Stellar Objects. Am. J. Astron. Astrophys. 2016, 4(6), 78-82. doi: 10.11648/j.ajaa.20160406.12

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AMA Style

Salam Ajitkumar Singh, Irom Ablu Meitei, Kangujam Yugindro Singh. Optical Luminosity Function of Quasi Stellar Objects. Am J Astron Astrophys. 2016;4(6):78-82. doi: 10.11648/j.ajaa.20160406.12

Copy | Download

@article{10.11648/j.ajaa.20160406.12,
  author = {Salam Ajitkumar Singh and Irom Ablu Meitei and Kangujam Yugindro Singh},
  title = {Optical Luminosity Function of Quasi Stellar Objects},
  journal = {American Journal of Astronomy and Astrophysics},
  volume = {4},
  number = {6},
  pages = {78-82},
  doi = {10.11648/j.ajaa.20160406.12},
  url = {https://doi.org/10.11648/j.ajaa.20160406.12},
  eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ajaa.20160406.12},
  abstract = {We study the shape of the optical luminosity function of Quasi Stellar Objects (QSOs) from the Sloan Digital Sky Survey Data Release Seven (SDSS DR7) over the redshift range 0.3 ≤ Z ≤ 2.4. By using the Levenberg-Marquardt method of nonlinear least square fit, the observed QSO luminosity function is fitted by a double power-law model with luminosity evolution characterized by a second order polynomial in redshift. For a flat universe with Ωm=0.3 and Ω Λ=0.7, we determine the best-fitting optical luminosity function model parameters.},
 year = {2016}
}

Copy | Download

TY  - JOUR
T1  - Optical Luminosity Function of Quasi Stellar Objects
AU  - Salam Ajitkumar Singh
AU  - Irom Ablu Meitei
AU  - Kangujam Yugindro Singh
Y1  - 2016/12/08
PY  - 2016
N1  - https://doi.org/10.11648/j.ajaa.20160406.12
DO  - 10.11648/j.ajaa.20160406.12
T2  - American Journal of Astronomy and Astrophysics
JF  - American Journal of Astronomy and Astrophysics
JO  - American Journal of Astronomy and Astrophysics
SP  - 78
EP  - 82
PB  - Science Publishing Group
SN  - 2376-4686
UR  - https://doi.org/10.11648/j.ajaa.20160406.12
AB  - We study the shape of the optical luminosity function of Quasi Stellar Objects (QSOs) from the Sloan Digital Sky Survey Data Release Seven (SDSS DR7) over the redshift range 0.3 ≤ Z ≤ 2.4. By using the Levenberg-Marquardt method of nonlinear least square fit, the observed QSO luminosity function is fitted by a double power-law model with luminosity evolution characterized by a second order polynomial in redshift. For a flat universe with Ωm=0.3 and Ω Λ=0.7, we determine the best-fitting optical luminosity function model parameters.
VL  - 4
IS  - 6
ER  -

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