74 citations · 539 across the 20 of their papers we have counts for
21 papers
Radiation Pressure Instability-Driven Variability of Line-Driven Disk Winds in AGNs: Connection to Periodic Luminosity Variations and UFO Appearance
Yutaro Kuroda, Ken Ohsuga, Mariko Nomura +1
We investigated the temporal variability of line-driven disk winds induced by radiation pressure instability in accretion disks surrounding supermassive black holes. This is the fi…
Resolving the Multiple Component Outflows in PG 1211+143: II. The Soft X-ray View of the Ultra Fast Outflow
James Reeves, Valentina Braito, Misaki Mizumoto +16
The nearby quasar, PG 1211+143, has one of the prototype examples of an ultra fast outflow (UFO), as seen in several past XMM-Newton and Chandra observations. In December 2024, PG…
Unification Model of Active Galactic Nuclei by Photoionization Equilibrium Calculation Based on Radiative Hydrodynamic Simulations
Atsushi Tanimoto, Keiichi Wada, Yuki Kudoh +3
To investigate the origin of the dependence of the covering factor on the Eddington ratio suggested by X-ray observations, we examined the angular distribution of HI and HII based…
Resolving the Multiple Component Outflows in PG 1211+143: I. The Fe-K Absorption Structure and UFO Forest
Misaki Mizumoto, James N. Reeves, Valentina Braito +15
We present the initial high-resolution X-ray spectroscopic observations of the Fe-K absorption structure in the luminous nearby quasar PG 1211+143, utilizing the X-ray Imaging and…
Multiphase Gas Nature in the Sub-parsec Region of the Active Galactic Nuclei. III. Eddington Ratio Dependence on the Structures of Dusty and Dust-free Outflows
Yuki Kudoh, Keiichi Wada, Nozomu Kawakatu +1
We investigated the influence of the Eddington ratio on sub-parsec-scale outflows in active galactic nuclei (AGNs) with supermassive black holes (SMBHs) masses of M$_{\odot}…
Multiphase Gas Nature in the Sub-parsec Region of the Active Galactic Nuclei I: Dynamical Structures of Dusty and Dust-free Outflow
Yuki Kudoh, Keiichi Wada, Nozomu Kawakatu +1
We investigated dusty and dust-free gas dynamics for a radiation-driven sub-pc scale outflow in an active galactic nucleus (AGN) associated with a supermassive black hole $10^7 M_\…
Qwind3: UV line-driven accretion disc wind models for AGN feedback
Arnau Quera-Bofarull, Chris Done, Cedric G. Lacey +2
The ultraviolet (UV) bright accretion disc in active galactic nuclei (AGN) should give rise to line driving, producing a powerful wind which may play an important role in AGN feedb…
Radiation hydrodynamics simulations of line-driven AGN disc winds: metallicity dependence and black hole growth
Mariko Nomura, Kazuyuki Omukai, Ken Ohsuga
Growth of the black holes (BHs) from the seeds to supermassive BHs (SMBHs, ) is not understood, but the mass accretion must have played an important role. We p…
UV line driven disc wind as the origin of ultrafast outflows in AGN
Misaki Mizumoto, Mariko Nomura, Chris Done +2
UltraFast Outflows (UFO) are observed in some active galactic nuclei (AGN), with blueshifted and highly ionised Fe-K absorption features. AGN typically have a UV bright accretion f…
The Fifth Candidate for an Intermediate-mass Black Hole in the Galactic Center
Shunya Takekawa, Tomoharu Oka, Yuhei Iwata +2
We report the results of high-resolution molecular line observations of the high-velocity compact cloud HCN-0.085-0.094 with the Atacama Large Millimeter/submillimeter Array. The H…
The thermal-radiative wind in low mass X-ray binary H 1743-322; Radiation hydrodynamic simulations
Ryota Tomaru, Chris Done, Ken Ohsuga +2
Blueshifted absorption lines are seen in high inclination black hole binary systems in their disc dominated states, showing these power an equatorial disc wind. While some contribu…
An energetic high-velocity compact cloud: CO0.31+0.11
Shunya Takekawa, Tomoharu Oka, Sekito Tokuyama +5
We have discovered an energetic high-velocity compact cloud CO0.31+0.11 in the central molecular zone of our Galaxy. CO0.31+0.11 is located at a projected distance of $\sim 4…
Indication of Another Intermediate-mass Black Hole in the Galactic Center
Shunya Takekawa, Tomoharu Oka, Yuhei Iwata +2
We report the discovery of molecular gas streams orbiting around an invisible massive object in the central region of our Galaxy, based on the high-resolution molecular line observ…
Line-driven disc wind in near-Eddington active galactic nuclei: decrease of mass accretion rate due to powerful outflow
Mariko Nomura, Ken Ohsuga, Chris Done
Based on recent X-ray observations, ultra-fast outflows from supermassive black holes are expected to have enough energy to dramatically affect their host galaxy but their launch a…
Magnetohydrodynamic Simulations of a Plunging Black Hole into a Molecular Cloud
Mariko Nomura, Tomoharu Oka, Masaya Yamada +4
Using two-dimensional magnetohydrodynamic simulations, we investigated the gas dynamics around a black hole plunging into a molecular cloud. In these calculations, we assumed a par…
Millimetre-wave Emission from an Intermediate-Mass Black Hole Candidate in the Milky Way
Tomoharu Oka, Shiho Tsujimoto, Yuhei Iwata +2
It is widely accepted that black holes (BHs) with masses greater than a million solar masses (Msun) lurk at the centres of massive galaxies. The origins of such `supermassive' blac…
Discovery of Two Small High-Velocity Compact Clouds in the Central 10 Parsecs of Our Galaxy
Shunya Takekawa, Tomoharu Oka, Yuhei Iwata +2
We discovered two small high-velocity compact clouds (HVCCs) in HCN and maps of the central 20 pc of our Galaxy. Both HVCCs have broad velocity widths ($ΔV \gtrsim…
Kinematics of Ultra-High-Velocity Gas in the Expanding Molecular Shell adjacent to the W44 Supernova Remnant
Masaya Yamada, Tomoharu Oka, Shunya Takekawa +6
We mapped the ultra-high-velocity feature (the "Bullet") detected in the expanding molecular shell associated with the W44 supernova remnant using the Nobeyama Radio Observatory 45…
Line-driven disk wind model for ultra-fast outflows in active galactic nuclei -- Scaling with luminosity
Mariko Nomura, Ken Ohsuga
In order to reveal the origin of the ultra-fast outflows (UFOs) that are frequently observed in active galactic nuclei (AGNs), we perform two-dimensional radiation hydrodynamics si…
Radiation Hydrodynamic Simulations of Line-Driven Disk Winds for Ultra Fast Outflows
Mariko Nomura, Ken Ohsuga, Hiroyuki R. Takahashi +2
Using two-dimensional radiation hydrodynamic simulations, we investigate origin of the ultra fast outflows (UFOs) that are often observed in luminous active galactic nuclei (AGNs).…
Modeling line-driven disk wind for broad absorption lines of quasars
Mariko Nomura, Ken Ohsuga, Keiichi Wada +2
The disk wind, which is powered by the radiation force due to spectral lines (line force), is studied for broad absorption line (BAL) quasars. We investigate the structure of the d…