Magnetospheric Eternally Collapsing Objects (MECOs): Likely New Class of   Source of Cosmic Particle Acceleration
  It is known that spinning pulsars could be source of VHE-UHE cosmic particle acceleration. It is also conjectured that (fictitious) spinning Black Holes (BH) could be sites of cosmic particle acceleration. However, it has been shown by Mitra and Leiter and Robertson that General Relativity (GR) actually does not allow the existence or formation of finite mass BHs. It was predicted that the BH Candiadates (BHCs) have strong intrinsic magnetic fields (like pulsars) instead of Event Horizons. And this prediction has tentatively been verified in a series of papers by Robertson & Leiter. Thus all observed BH Candidates are actually not BHs, and, they are expected to be MECOs. Stellar mass MECOs are GR analogs of conventionally known isolated pulsars. While pulsars are/have (i) COLD, i.e., not supported by radiation pressure, MECOs are HOT, i.e., supported primarily by trapped radiation pressure, (ii) upper mass limit of 3-4 Msolar MECOs, being HOT, have no Upper Mass Limit, (iii) surface gravitational red shift, z ~ 0.1 -0.2, MECOs have z >> 1 so that photons can remain almost permanently trapped inside them, (iv) magnetic field B <10^{13} G, for MECOs the local value of B >> 10^{13} G. It may be recalled that isolated (non- accreting) uncharged BHs are cold and dead objects without any physical activity. On the other hand, isolated spinning MECOs are like extreme GR pulsars. 
Abhas Mitra