The nature of the 4th track in GX 5-1: discovery of Fe XXVI RRC in massive flares

Details The nature of the 4th track in GX 5-1: discovery of Fe XXVI RRC in massive flares The nature of the 4th track in GX 5-1: discovery of Fe XXVI RRC in massive flares

2009-10-22

arxiv.org/abs/0910.4260v1

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

6 pages, 8 figures; invited contribution to the Frascati Workshop 2009 "Multifrequency behaviour of high energy cosmic sources

Scientific paper

We present an explanation of the 4th branch of the Z-track based on analysis of high-quality RXTE data on the source GX 5-1. Spectral analysis shows that the physical evolution on the 4th track is a continuation of the flaring branch which we previously proposed consists of unstable nuclear burning of the accretion flow on the neutron star. In flaring there is a huge increase of the neutron star emission from a volume that increases to a radius of 21 km. The 4th branch is shown to consist of flaring under conditions that the mass accretion rate and thus the total source luminosity is falling. We detect strong emission on the flaring and 4th branches at energies between 7.8 - 9.4 keV inconsistent with origin as Fe K emission, which we suggest is the radiative recombination continua (RRC) of iron Fe XXVI at 9.28 keV and of lower states. Evolution of the emission takes place, the energy falling but the flux increasing strongly, consistent with production in the large volume of unstable nuclear burning around the neutron star which eventually cools.

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