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Active galactic nuclei with high-resolution X-ray spectroscopy
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The imminent launch of XRISM will usher in an era of high-resolution X-ray spectroscopy. For active galactic nuclei (AGN) this is an exciting epoch that is full of massive potential for uncovering the ins and outs of supermassive black hole accretion. In this work, we review AGN research topics that are certain to advance in the coming years with XRISM and prognosticate the possibilities with Athena and Arcus. Specifically, our discussion focuses on: (i) the relatively slow moving ionised winds known as warm absorbers and obscurers; (ii) the iron emitting from different regions of the inner and outer disc, broad line region, and torus; and (iii) the ultrafast outflows that may be the key to understanding AGN feedback.
Forward citations
Cited by 7 Pith papers
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XRISM analysis of the complex Fe K$\alpha$ line in Centaurus A
XRISM's precision X-ray detector shows the iron K-alpha line of Centaurus A is a narrow doublet plus a broad component, implying emitting gas spans roughly 0.001 to 10 parsecs.
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Delving into the depths of NGC 3783 with XRISM. I. Kinematic and ionization structure of the highly ionized outflows
XRISM spectroscopy of NGC 3783 reveals six outflow components; one broad Fe XXVI absorber moves at 0.05 c with kinetic luminosity 0.8-3% of bolometric.
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Dissecting the Nuclear Structure of NGC 5548 with XRISM. I. Physical Properties of the Highly Ionized Outflows
First detection of Fe XXV and Fe XXVI absorption in NGC 5548 with XRISM shows a multiphase outflow with a broken power-law absorption measure distribution.
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The emergence of X-ray emission lines during relativistic radio-jet formation in the changing-look active galactic nucleus 1ES 1927+654
X-ray emission lines and a broad iron feature emerged in changing-look AGN 1ES 1927+654 concurrently with radio-jet formation and declining ionized outflows from 2022 to 2025.
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XRISM Spectroscopy of Accretion-Driven Wind Feedback in NGC 4151
XRISM spectra of NGC 4151 reveal up to six simultaneous wind components, and two ultra-fast outflows carry kinetic power exceeding 0.5 percent of Eddington, enough for galaxy-scale feedback.
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A Spectral Energy Distribution Variability Study of the Eclipsing AGN NGC 6814
Multi-epoch Swift SED fits of NGC 6814 find the accretion disk inner edge at 58 to 270 gravitational radii, far outside the ISCO, suggesting a non-standard inner disk.
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Unraveling the structure of the stratified ultra-fast outflows in PDS 456 with XRISM
Spectra from XRISM suggest the five fast X-ray outflows in PDS 456 are stratified by ionization, with a weak and not statistically significant trend v_out proportional to the ionization parameter to the power 0.14, pl...
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