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EP: Fachverband Extraterrestrische Physik

EP 4: Poster Session

EP 4.9: Poster

Tuesday, February 26, 2013, 11:15–12:45, Poster OG

Bounds on the compactness of the isolated neutron stars via X-ray phase-resolved spectroscopy. — •Valeri Hambaryan — AIU Jena

We try to constrain compactness, thereby the nuclear Equation-of-State, of the isolated neutron stars in our galactic neighborhood. There are seven thermally emitting isolated neutron stars known from X-ray and optical observations, radio-quiet with blackbody-like X-ray spectra. Among them two (RBS1223 and RXJ0720) are very well suited to perform rotational phase-resolved X-ray spectroscopy, thanks to the observed large pulsed fractions and multi-epoch pointed observations, conducted by XMM and/or Chandra X-ray observatories. With number of models of magnetized atmosphere we fitted simultaneously the observed general spectral shape and the broad absorption feature in different spin-phases of the isolated neutron star, allowing to derive bounds of the gravitational redshift.