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

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

2009-03-10

arxiv.org/abs/0903.1749v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

4 pages,4 figures, A&A accepted

Scientific paper

10.1051/0004-6361/200811378

We found a narrow absorption feature at 0.57keV in the co-added RGS spectrum of the isolated neutron star RX J0720.4-3125 with an equivalent width of 1.35+/-0.3eV and FWHM ~6.0eV. 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 originates in a relatively dense (e.g. nH~10^8 cm^-3) slab, located in the vicinity of the neutron star (e.g. ~10^10cm).

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