The Eddington Limit and Soft Gamma Repeaters

Details The Eddington Limit and Soft Gamma Repeaters The Eddington Limit and Soft Gamma Repeaters

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996apj...463..305k&link_type=abstract

Astrophysical Journal v.463, p.305

Astronomy and Astrophysics

Astronomy

11

Accretion, Accretion Disks, Gamma Rays: Bursts, Magnetohydrodynamics: Mhd, Stars: Neutron

Scientific paper

Observed intensities and inferred distances of soft gamma repeaters (SGRs) imply luminosities in excess of the nominal (electron scattering opacity) Eddington limit by 4-6 orders of magnitude. I review the physical basis of this limit. Accretional luminosities may exceed it if energy is hydrodynamically coupled from accreting matter to closed field lines where it forms a pair gas. This magnetically confined pair gas radiates roughly a blackbody spectrum with kB Te ≍ 23 keV, consistent with observations, at a luminosity up to ˜3 x 1044 ergs s-1 for a surface field of 1013 G. Magnetic transparency is not required. I discuss the minutes-long continuing emission of 1979 March 5, steady counterparts to SGRs and their spin periods.

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