Polarized radiative transfer modeling of warped and clumpy dusty tori - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Astronomy and Astrophysics - A&A Année : 2017

Polarized radiative transfer modeling of warped and clumpy dusty tori

M. Schartmann
  • Fonction : Auteur

Résumé

Context. Active galactic nuclei (AGN) are anisotropic objects surrounded by an optically thick equatorial medium whose true geometry still defies observers.Aims. We aim to explore the optical scattering-induced polarization that emerges from clumpy and warped dusty tori to check whether they can fit the unified model predictions.Methods. We ran polarized radiative transfer simulations in a set of warped and non-warped clumpy tori to explore the differences induced by distorted dust distributions. We then included warped tori in a more complex model representative of an AGN to check, using polarimetry and imaging methods, whether warps can reproduce the expected polarization dichotomy between Seyfert-I and Seyfert-II AGN.Results. The main results from our simulations highlight that isolated warped structures imprint the polarization degree and angle with distinctive signatures at Seyfert-I orientations. Included in an AGN model, the signatures of warps are easily (but not always) washed out by multiple scattering in a clumpy environment. Imaging polarimetry may help to detect warped tori, but we prove that warps can exist in AGN circumnuclear regions without contradicting observations.Conclusions. Two warped tori with a non-significant difference in geometry in terms of photometry or spectroscopy can have entirely different signatures in polarimetry. Testing the geometry of any alternative model to the usual dusty torus using polarized radiative transfer is a necessary approach to verify or reject a hypothesis.Key words: galaxies: active / galaxies: Seyfert / polarization / radiative transfer / scattering
Fichier principal
Vignette du fichier
aa31190-17.pdf (951.63 Ko) Télécharger le fichier
Origine : Publication financée par une institution
Loading...

Dates et versions

hal-01645920 , version 1 (13-10-2020)

Identifiants

Citer

F. Marin, M. Schartmann. Polarized radiative transfer modeling of warped and clumpy dusty tori. Astronomy and Astrophysics - A&A, 2017, 607, pp.A37. ⟨10.1051/0004-6361/201731190⟩. ⟨hal-01645920⟩
26 Consultations
48 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More