The flat X-ray spectrum of the LINER NGC1052

Details The flat X-ray spectrum of the LINER NGC1052 The flat X-ray spectrum of the LINER NGC1052

1998-12-21

arxiv.org/abs/astro-ph/9812385v1

Astronomy and Astrophysics

Astrophysics

5 pages, Latex, 2 Postscript figures, accepted for publication in MNRAS

Scientific paper

10.1046/j.1365-8711.1999.02470.x

We report on ROSAT and ASCA observations of the LINER NGC1052, which is the first one where broad optical lines in polarized light have been observed. The 2-10 keV spectrum is very flat, with an observed photon index (Gamma) ~0.1. A model where a nuclear source is - partly or totally - obscured by a screen of matter with column density ~10^23 atom/cm/cm is the most convincing explanation for the observed flatness. This agrees with the hypothesis that the LINERs are a population of low-luminosity AGN, to which the Seyfert unification scenario applies. The intrinsic spectral index is still rather flat (1.0-1.4), as observed in a few type-2 Seyferts so far or predicted if the accretion occurs in an advection-dominated flow.

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