Tell-tale Spectral Signatures of MHD-driven Ultrafast Outflows in AGNs
May 18, 202226 pages
Published in:
- Astrophys.J. 940 (2022) 1, 6
- Published: Nov 15, 2022
e-Print:
- 2205.08894 [astro-ph.HE]
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Abstract: (IOP)
We aim to explore spectral signatures of the predicted multi-ion ultrafast outflows (UFOs) in the broadband X-ray spectra of active galactic nuclei by exploiting an accretion disk-wind model in the context of a simple magnetohydrodynamic (MHD) framework. We are focused primarily on examining the spectral dependences on a number of key properties: (1) ionizing luminosity ratio λ
, (2) line-of-sight wind density slope p, (3) optical/UV-to-X-ray strength α
, (4) inclination θ, (5) X-ray photon index Γ, and (6) wind density factor f
. With an emphasis on radio-quiet Seyferts in the sub-Eddington regime, multi-ion UFO spectra are systematically calculated as a function of these parameters to show that MHD-driven UFOs imprint a unique asymmetric absorption line profile with a pronounced blue tail structure on average. Such a characteristic line signature is generic to the simplified MHD disk-wind models presented in this work due to their specific kinematics and density structure. The properties of these absorption line profiles could be utilized as a diagnostics to distinguish between different wind-driving mechanisms or even the specific values of given MHD wind parameters. We also present high-fidelity microcalorimeter simulations in anticipation of the upcoming XRISM/Resolve and Athena/X-IFU instruments to demonstrate that such a “tell-tale” sign may be immune to a spectral contamination by the presence of additional warm absorbers and partially covering gas.Note:
- accepted to ApJ
References(139)
Figures(51)