International Journal of Astrophysics and Space Science

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Radiative Efficiency of Black Holes in AGN

Received: 02 October 2013    Accepted:     Published: 30 October 2013
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Abstract

Neeraj Pant et al.(2010) gave a detailed study of BCT First solution (Tewari,1988) representing time dependent balls of perfect fluid with matter-radiation in general relativity to assume the life time of quasar 107 years, initial mass≈108M with an initial linear dimension≈1015 cm are radiating energy at a constant rate i.e. L∞=1047 ergs/sec with the gravitational red shift, z=0.44637. For quasars with LQSO~1046erg/sec, the black hole masses in those systems must be at least 108 solar masses (Astro 3830: Spring 2004). In the present work, we have calculated the radiative efficiency of black holes existing in AGN by using the formula L/Mc2 (Narayan2005, Xie & Yuan 2012) and compared our results regarding some characteristics of super massive black holes with some other works given in references like Astro 3830:Spring (2004), Narayan (2005), Xie & Yuan (2012) and Chan (2013) and concluded that the mass of black holes never be greater than 5×109 M⊙ as well as the radiative efficiency of black hole is smaller than the same mass of quasars.

DOI 10.11648/j.ijass.20130104.16
Published in International Journal of Astrophysics and Space Science (Volume 1, Issue 4, October 2013)
Page(s) 52-55
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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), 2024. Published by Science Publishing Group

Keywords

XRBs, Radiative Efficiency, AGN

References
[1] B. Mckernan, K.E.S. Ford and C. S. Reynolds: Black hole mass, Host galaxy classification and AGN activity. arXiv: 10054907vi[astro-ph].26 May 2010.
[2] L. Ferrarese & H. Ford: Super massive Black Holes in Galactic Nuclei: Past Present & Future Research, Space Science Reviews 116:523-624, 2005.
[3] A. C. Fabian: "Broad iron lines in AGN and X-ray binaries." Astrophysics and space Science 300: 97-105, 2005, DOI: 10.1007/s10509-005-1203-x.
[4] Neeraj Pant & B.C. Tiwari: "Horizon- free gravitational collapse of radiating fluid sphere." Astrophys and space science (2010).
[5] R. Narayan: Black Holes in Astrophysics, New Journal Physics, Vol. 7, No.1, 2005, pp1-31.
[6] Fu-Guo Xie and Feng Yuan: The Radiative Efficiency of Hot Accretion Flows. arXiv :1207.3113v2[astro-ph.] 3 Sept. 2012.
[7] M.H. Chan: Shaping the relation between the mass of the super massive black holes and the velocity dispersion of galactic bulges, Astrophys Space Science. DOI: 10.1007/s 10509-013-1373-x, May 2013, Volume 345, issue 1, pp195-198.
[8] D. Mahto, V. Prakash, B.K.Singh, K.M. Singh: Change in entropy of Non-spinning black holes w.r.t. the radius of event horizon in XRBs, Astrophys SpaceSci. Doi 10.1007/s10509-012-1219-y (2012).
[9] Mahto, D, Nadeem, M. D., Prasad, U., Kumar, A.& Singh, K.M.: Change in entropy of Non-spinning black holes w.r.t. the radius of event horizon in AGN, Journal of Modern Physics, doi:10.4236/jmp.2013.43043, March 2013.
[10] W.L.W. Sargent. et al. :Dynamical Evidence for a Central Mass Concentration in the Galaxy M87, The Astrophysical Journal, Vol. 221, 1978, p.731.
[11] Astro 3830: Spring 2004.
Author Information
  • Department of Physics, Marwari College, T.M.B.U. Bhagalpur-812007, India

  • Department of Mathematics, T.M.B.U. Bhagalpur-812007, India

  • Department of Physics, T. N. B. College, T.M.B.U. Bhagalpur-812007, India

  • Dept. of Physics, S.S.V. College, Kahalgaon, T.M.B.U. Bhagalpur-812007, India

  • Department of Physics, Marwari College, T.M.B.U. Bhagalpur-812007, India

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    Dipo Mahto, Rama Nand Mehta, Umakant Prasad, Raj Kumar Sah, Krishna Murari Singh. (2013). Radiative Efficiency of Black Holes in AGN. International Journal of Astrophysics and Space Science, 1(4), 52-55. https://doi.org/10.11648/j.ijass.20130104.16

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    ACS Style

    Dipo Mahto; Rama Nand Mehta; Umakant Prasad; Raj Kumar Sah; Krishna Murari Singh. Radiative Efficiency of Black Holes in AGN. Int. J. Astrophys. Space Sci. 2013, 1(4), 52-55. doi: 10.11648/j.ijass.20130104.16

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    AMA Style

    Dipo Mahto, Rama Nand Mehta, Umakant Prasad, Raj Kumar Sah, Krishna Murari Singh. Radiative Efficiency of Black Holes in AGN. Int J Astrophys Space Sci. 2013;1(4):52-55. doi: 10.11648/j.ijass.20130104.16

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  • @article{10.11648/j.ijass.20130104.16,
      author = {Dipo Mahto and Rama Nand Mehta and Umakant Prasad and Raj Kumar Sah and Krishna Murari Singh},
      title = {Radiative Efficiency of Black Holes in AGN},
      journal = {International Journal of Astrophysics and Space Science},
      volume = {1},
      number = {4},
      pages = {52-55},
      doi = {10.11648/j.ijass.20130104.16},
      url = {https://doi.org/10.11648/j.ijass.20130104.16},
      eprint = {https://download.sciencepg.com/pdf/10.11648.j.ijass.20130104.16},
      abstract = {Neeraj Pant et al.(2010) gave a detailed study of BCT First solution (Tewari,1988) representing time dependent balls of perfect fluid  with matter-radiation in general relativity to assume the life time of quasar 107 years, initial mass≈108M with an initial linear dimension≈1015 cm are radiating energy at a constant rate i.e. L∞=1047 ergs/sec  with the gravitational  red shift, z=0.44637.  For quasars with LQSO~1046erg/sec, the black hole masses in those systems must be at least 108 solar masses (Astro 3830: Spring 2004). In the present work, we have calculated the radiative efficiency of black holes existing in AGN by using the formula L/Mc2 (Narayan2005, Xie & Yuan 2012) and compared our results regarding some characteristics of super massive black holes with some other works given in references like Astro 3830:Spring (2004), Narayan (2005), Xie & Yuan (2012) and Chan (2013) and concluded that the mass of black holes never be greater than 5×109 M⊙ as well as the radiative efficiency of  black hole is smaller than the same mass of quasars.},
     year = {2013}
    }
    

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  • TY  - JOUR
    T1  - Radiative Efficiency of Black Holes in AGN
    AU  - Dipo Mahto
    AU  - Rama Nand Mehta
    AU  - Umakant Prasad
    AU  - Raj Kumar Sah
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    T2  - International Journal of Astrophysics and Space Science
    JF  - International Journal of Astrophysics and Space Science
    JO  - International Journal of Astrophysics and Space Science
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    PB  - Science Publishing Group
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    UR  - https://doi.org/10.11648/j.ijass.20130104.16
    AB  - Neeraj Pant et al.(2010) gave a detailed study of BCT First solution (Tewari,1988) representing time dependent balls of perfect fluid  with matter-radiation in general relativity to assume the life time of quasar 107 years, initial mass≈108M with an initial linear dimension≈1015 cm are radiating energy at a constant rate i.e. L∞=1047 ergs/sec  with the gravitational  red shift, z=0.44637.  For quasars with LQSO~1046erg/sec, the black hole masses in those systems must be at least 108 solar masses (Astro 3830: Spring 2004). In the present work, we have calculated the radiative efficiency of black holes existing in AGN by using the formula L/Mc2 (Narayan2005, Xie & Yuan 2012) and compared our results regarding some characteristics of super massive black holes with some other works given in references like Astro 3830:Spring (2004), Narayan (2005), Xie & Yuan (2012) and Chan (2013) and concluded that the mass of black holes never be greater than 5×109 M⊙ as well as the radiative efficiency of  black hole is smaller than the same mass of quasars.
    VL  - 1
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    ER  - 

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