8–13 Sept 2019
Europe/Rome timezone
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Unveiling the intrinsic AGN strength in a 12 micron-selected Seyfert 2 sample

12 Sept 2019, 12:10
15m

Speaker

Francesco Salvestrini (DiFA - Università di Bologna)

Description

The ability of the X-rays to penetrate and measure large columns of obscuring material is crucial to characterise the emission from the Active Galactic Nuclei (AGN), especially those with heavy obscuration and/or weak emission.
In this work we exploit the largest energy band available in the X-rays ($\sim$0.5-30 keV) to accurately assess the intrinsic power and obscuration for a sample of 30 local Seyferts 2, selected from the 12$\mu$m galaxy sample (12MGS; Rush, Malkan & Spinoglio 1993).
Coupling the information from the systematic study of the X-ray properties of the proposed sample with the accurate SED decomposition by Gruppioni et al. (2016), which provides a complete characterisation of the source properties, from the small scales (L$_{\rm bol}$, i.e. the accretion power of the AGN) to the kpc-scales (M$_{\star}$ and SFR), we obtain a comprehensive picture of the contribution of the AGN in an almost complete Seyfert 2 sample from the 12MGS.
We present i) the first accurate determination of the intrinsic power (L$_{\rm X}$) and the column density (N$_{\rm H}$) of the obscuring material for the proposed objects; ii) the comparison of the column density (N$_{\rm H}$) obtained from the obscuration in the X-rays with that derived from the SED decomposition, parametrised by the optical dept ($\tau$) associated to the 9.7$\mu$m absorption feature; iii) for the objects with available interferometric observations of CO emission, assuming a suitable $\alpha_{\rm CO}$ conversion factor, we estimate the host galaxy gas content in order to assess whether the host galaxy contributes in hiding the nucleus.

Affiliation UNIVERSITA' DI BOLOGNA
Topic Active Galactic Nuclei: accretion physics and evolution across cosmic time

Primary authors

Francesco Salvestrini (DiFA - Università di Bologna) Dr Francesca Pozzi (DiFA - Università di Bologna)

Co-authors

Cristian Vignali (Dipartimento di Fisica e Astronomia, Università di Bologna) Carlotta Gruppioni (Istituto Nazionale di Astrofisica (INAF))

Presentation materials