Physics – Nuclear Physics
Scientific paper
Jun 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004nuphs.132..185g&link_type=abstract
Nuclear Physics B Proceedings Supplements, Volume 132, p. 185-188.
Physics
Nuclear Physics
1
Scientific paper
We report on an observation of the Seyfert 1 galaxy ESO 141-G55 performed in October 2001 with the EPIC MOS cameras and Reflection Grating Spectrometers (RGS) on board the XMM - Newton observatory. We find the hard (3-10 keV) continuum slope, including reflection, to be somewhat flatter (Γ=1.72+/-0.06) than that of a typical broad-line Seyfert 1 galaxy. The spectrum shows a weak emission line at 6.45 +/- 0.04 keV with a measured equivalent width of ~ 40 eV. A broad spectral feature is observed around 7 keV that can be fitted by an absorption edge at 7.6 +/- 0.1 keV. The extrapolation of the primary power law continuum to energies lower than 2 keV indicates the presence of a soft excess component contributing 45+/- 3% of the overall flux in the 0.3-2.0 keV energy range. This soft-excess cannot be explained solely by enhanced reflection from a highly ionized disk.
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