Probing the unified model in NGC 7314
SRON Netherlands Institute for Space Research, Sorbonnelaan 2, 3584 CA Utrecht, The Netherlands
2 Astronomical Institute, University of Utrecht, Postbus 80000, 3508 TA, Utrecht, The Netherlands
3 Dipartimento di Astronomia, Universitá di Bologna, via Ranzani 1, 40127, Bologna, Italy
4 INAF - IASF Bologna, via Gobetti 101, 40129 Bologna, Italy
Received: 7 July 2011
Accepted: 5 September 2011
Aims. We aim at studying the complex absorbed X-ray spectrum of the Narrow Line Seyfert 1 galaxy NGC 7314.
Methods. We collected available public X-ray data from the archives of XMM-Newton, Suzaku, and ASCA. The spectra were analyzed using the fitting package SPEX.
Results. We find evidence of intrinsic neutral and ionized absorption in the XMM-Newton EPIC-pn spectrum. The ionized gas presents three significantly distinct ionization phases, although its kinematic properties could not be disentangled. At least two of these phases are also detected in the RGS spectrum, although with less significance due to the low statistics. The ASCA and Suzaku spectra show larger neutral absorption but no ionized gas signatures. The Fe Kα emission line is detected in all the observations and, additionally, Fe xxvi in the EPIC-pn spectrum, and Fe Kβ in the Suzaku XIS spectrum.
Conclusions. Using this observational evidence we construct a consistent picture of the geometry of the system in the context of the unified model of active galactic nuclei. The different observational properties are thus interpreted as clouds of neutral gas moving across our line of sight, which would be grazing a clumpy dusty torus.
Key words: galaxies: Seyfert / X-rays: galaxies / quasars: absorption lines / galaxies: individual: NGC 7314
© ESO, 2011