The nature of the accretion disk and surrounding material in the nucleus of NGC1097

Thaisa Storchi-Bergmann (Instituto de Fisica, UFRGS)

I present results from the modelling of the continuum emission of the nucleus of NGC1097 in X-rays, UV and optical, using new Chandra and STIS-HST observations. It is shown that the nuclear source is well described by an advection dominated accretion flow (ADAF), which is the ionizing source of an outer thin disk where the double-peaked emission lines are originated. In order to reproduce the SED, it is necessary to include also the continuum emission of the thin disk, which peaks in the optical/near-IR. Besides the ADAF and thin disk emission, an additional source of continuum is present in the UV, as well as a number of absorption features. I discuss the nature of this source as well as the origin of the absorption features.

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