XMM-Newton RGS spectrum of RX J0720.4-3125: Absorption feature at 0.57 keV

Details XMM-Newton RGS spectrum of RX J0720.4-3125: Absorption feature at 0.57 keV XMM-Newton RGS spectrum of RX J0720.4-3125: Absorption feature at 0.57 keV

Sep 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hrxs.confe..20h&link_type=abstract

"High Resolution X-ray Spectroscopy: Towards IXO, Proceedings of the international workshop held at the Mullard Space Science La

Physics

Scientific paper

We found an absorption feature at 0.57 keV in the co-added RGS spectrum of the isolated neutron star RX J0720.4-3125 with an equivalent width of 1.35 +/- 0.3 eV and FWHM ~6.0 eV. The feature was identified with an absorption line of highly ionized oxygen OVII, most probably originating in the ambient medium of RX J0720.4-3125. An extensive investigation with the photo-ionization code CLOUDY indicates the possibility that the optical flux excess observed in the spectrum of RX J0720.4-3125, at least partially may originate in a relatively dense (e.g. nH ~ 10^8 cm^-3) slab, located in the vicinity of the neutron star (e.g. ~ 10^10 cm).

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