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Gravitationally redshifted absorption lines in the X-ray burst spectra of a neutron star

Mendez, M.; Paerels, F.; Cottam, J.

The fundamental properties of neutron stars provide a direct test of the equation of state of cold nuclear matter, a relationship between pressure and density that is determined by the physics of the strong interactions between the particles that constitute the star. The most straightforward method of determining these properties is by measuring t…

The signature of supernova ejecta in the X-ray afterglow of the γ-ray burst 011211

Schartel, N.; Ehle, M.; Watson, D. +8 more

Now that γ-ray bursts (GRBs) have been determined to lie at cosmological distances, their isotropic burst energies are estimated to be as high as 10⁵⁴erg (ref. 2), making them the most energetic phenomena in the Universe. The nature of the progenitors responsible for the bursts remains, however, elusive. The favoured models range from t…