Heavy obscuration in X-ray weak AGNs

Details Heavy obscuration in X-ray weak AGNs Heavy obscuration in X-ray weak AGNs

1998-06-03

arxiv.org/abs/astro-ph/9806055v2

Astronomy and Astrophysics

Astrophysics

15 pages, 7 figs. Accepted for publication by A&A. Typos in tables corrected. Fig. 5 modified

Scientific paper

We present observations in the 0.1-100 keV spectral band of 8 Seyfert 2 galaxies, obtained by means of BeppoSAX. These sources were selected according to their [OIII] optical emission line flux, to avoid biases against obscuration on the pc scale. All sources were detected. All of them are weak X-ray emitters, and most of them are characterized by prominent iron lines at 6.4-7 keV (EW > 500 eV) and by a flat continuum, indicative of heavy obscuration along our line of sight (N_H > 10^25 cm^-2 in most cases). These results 1) provide further evidence in favor of the unified scenario, and 2) indicate that the average obscuration of type 2 AGNs is very likely much higher than deduced by former X-ray surveys. These findings have important implications for the synthesis of the X-ray background.

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