Physics
Scientific paper
Apr 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..aprj14014r&link_type=abstract
American Physical Society, April Meeting, April 28 - May 1, 2001 Washington, DC Bulletin of the American Physical Society, Vol.
Physics
Scientific paper
The spectral state switches of low mass x-ray binaries may be evidence of magnetospheric ``propeller effects" in both neutron star (NS) and black hole candidate(BHC) systems. Analyses of the spectral state switches of NS yield accurate spin rates and magnetic field strengths comparable with those of the known millisecond pulsars. The known spins and magnetic moments permit the calculation of magnetospheric quiescent luminosities in agreement with observations. Similar analyses for BHC systems yield typical spin rates of tens of Hz and magnetic moments on the order of 10^29 gauss cm^3. We find that calculated quiescent BHC luminosities are lower than those for NS and also agree with CHANDRA observations. What is remarkable is that event horizons play no role in accounting for these BHC observations! These results, along with a general lack of qualitative spectral and timing differences between NS and BHC binary systems, strongly suggest that BHC possess intrinsic magnetic moments that interact with their accretion disks. If confirmed by further studies this would provide strong support for theoretical modifications which eliminate event horizons from General Relativity.(Leiter, D.J., and Robertson ,S.L. , LANL, eprint arXiv.org, e-print gr-qc/0101025)
Leiter Darryl J.
Robertson Stanley L.
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