Radiative Efficiency of Black Holes in AGN
International Journal of Astrophysics and Space Science
Volume 1, Issue 4, October 2013, Pages: 52-55
Received: Oct. 2, 2013;
Published: Oct. 30, 2013
Views 1997 Downloads 83
Dipo Mahto, Department of Physics, Marwari College, T.M.B.U. Bhagalpur-812007, India
Rama Nand Mehta, Department of Mathematics, T.M.B.U. Bhagalpur-812007, India
Umakant Prasad, Department of Physics, T. N. B. College, T.M.B.U. Bhagalpur-812007, India
Raj Kumar Sah, Dept. of Physics, S.S.V. College, Kahalgaon, T.M.B.U. Bhagalpur-812007, India
Krishna Murari Singh, Department of Physics, Marwari College, T.M.B.U. Bhagalpur-812007, India
Follow on us
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.
XRBs, Radiative Efficiency, AGN
To cite this article
Rama Nand Mehta,
Raj Kumar Sah,
Krishna Murari Singh,
Radiative Efficiency of Black Holes in AGN, International Journal of Astrophysics and Space Science.
Vol. 1, No. 4,
2013, pp. 52-55.
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.
L. Ferrarese & H. Ford: Super massive Black Holes in Galactic Nuclei: Past Present & Future Research, Space Science Reviews 116:523-624, 2005.
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.
Neeraj Pant & B.C. Tiwari: "Horizon- free gravitational collapse of radiating fluid sphere." Astrophys and space science (2010).
R. Narayan: Black Holes in Astrophysics, New Journal Physics, Vol. 7, No.1, 2005, pp1-31.
Fu-Guo Xie and Feng Yuan: The Radiative Efficiency of Hot Accretion Flows. arXiv :1207.3113v2[astro-ph.] 3 Sept. 2012.
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.
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).
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.
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.
Astro 3830: Spring 2004.