2005/10/07 by Abhas Mitra, Mitra, Abhas
Physics and Astronomy · #Astrophysical Phenomena and Observations #Astrophysics (astro-ph) #FOS: Physical sciences #Gamma-ray bursts and supernovae #Pulsars and Gravitational Waves Research #astro-ph
paper · pdf · doi:10.48550/arxiv.astro-ph/0510205
4 pages, paper presented in COSPAR colloquium on Spectra and Timing of Compact X-ray Binaries (2005), Proc. to be published by Elsevier Sc, final version, important new ref. added
openalex publication_date 2005/10/07 · arxiv created 2006/04/22 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
It is shown here that the so-called spinning Black Hole Candidates (BHCs) cannot be Black Holes (BHs) at all and, on the other hand, must be spinning hot Eternally Collapsing Objects (ECOs). The question would then arise why the spinning BHCs do not reveal their spin pulsation unlike the spinning cold Neutron Stars (NSs). Even for magnetized NSs with ``hard surfaces'', there may be no observed spin pulsation if the dipole axis and spin direction are exactly same. However, spinning ECOs do not show spin pulsation because their surface gravitational red shift is extremely high, z >> 1 and could be in the range of 107-8 for stellar mass range. In contrast NSs have z ~ 0.1 -0.3. The time profile of periodic signals generated on the surface of a spinning MECO get extremely distorted due to extreme general relativistic frame dragging effect as they traverse through extremely steep gravitational field. However, if any radiation would be formed in the ECO magnetosphere sufficiently away from the surface like in the pulsar ``outer slots''(which may happen for isolated spinning ECOs), it might be a pulsed one.