Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998tx19.confe.424m&link_type=abstract
Abstracts of the 19th Texas Symposium on Relativistic Astrophysics and Cosmology, held in Paris, France, Dec. 14-18, 1998. Eds.:
Astronomy and Astrophysics
Astrophysics
Scientific paper
We have recently shown that General Theory of Relativity precludes the formation of Trapped Surfaces and Event Horizons (Mitra, astro-ph/9803013, 9803014). Therefore, the cores of the AGNs or Galaxies can not be Supermassive Black Holes (SMBHs), and, on the other hand, they could be Supermassive Stars (SMSs). However, unlike the original idea of Hoyle and Fowler, these SMSs need not be in hydrostatic equilibrium and supported by nuclear energy release. On the other hand, they could be undergoing gravitational contraction and releasing energy by Kelvin-Helhmoltz process in addition to likely nuclear means. We will point out that under certain conditions the predominant mode of energy release could be in the form of nus, which are not detectable at present, and this may explain why the accretion luminosity (in the electromagnetic band) of many AGNs is extremely low compared to the inferred accretion rate.
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