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Top-heavy stellar mass distribution in galactic nuclei inferred from the universally high abundance ratio of [Fe/Mg]
Daisuke Toyouchi, Kohei Inayoshi, Miho N. Ishigaki +1
Recent observations of active galactic nuclei (AGNs) have shown a high Fe~II/Mg~II line-flux ratio in their broad-line regions, nearly independent of redshift up to .…
The extreme properties of the nearby hyper-Eddington accreting Active Galactic Nucleus in IRAS 04416+1215
Alessia Tortosa, Claudio Ricci, Francesco Tombesi +6
The physical properties of the accretion flow and of the X-ray emitting plasma, in supermassive black holes accreting at extreme Eddington rates, are still very unclear. Here we pr…
Rapid growth of seed black holes during early bulge formation
Kohei Inayoshi, Riouhei Nakatani, Daisuke Toyouchi +3
We study the early growth of massive seed black holes (BHs) via accretion in protogalactic nuclei where the stellar bulge component is assembled, performing axisymmetric two-dimens…
The Eccentric and Accelerating Stellar Binary Black Hole Mergers in Galactic Nuclei: Observing in Ground and Space Gravitational Wave Observatories
Fupeng Zhang, Xian Chen, Lijing Shao +1
We study the stellar binary black holes (BBHs) inspiralling/merging in galactic nuclei based on our numerical method GNC. We find that of all new born BBHs will finally me…
Dynamics and Morphology of Cold Gas in Fast, Radiatively Cooling Outflows: Constraining AGN Energetics with Horseshoes
Yu Qiu, Haojie Hu, Kohei Inayoshi +3
Warm ionized and cold neutral outflows with velocities exceeding are commonly observed in galaxies and clusters. Theoretical studies however indicate that r…
A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). IV. Rapidly Growing (Super-)Massive Black Holes in Extremely Radio-Loud Galaxies
Kohei Ichikawa, Takuji Yamashita, Yoshiki Toba +19
We present the optical and infrared properties of 39 extremely radio-loud galaxies discovered by cross-matching the Subaru/Hyper Suprime-Cam (HSC) deep optical imaging survey and V…
Light, medium-weight or heavy? The nature of the first supermassive black hole seeds
F. Sassano, R. Schneider, R. Valiante +5
Observations of hyper-luminous quasars at reveal the rapid growth of supermassive black holes (SMBHs ) whose origin is still difficult to explain. Their…
Evolution of high-redshift quasar hosts and promotion of massive black hole seed formation
Wenxiu Li, Kohei Inayoshi, Yu Qiu
High-redshift luminous quasars powered by accreting supermassive black holes (SMBHs) with mass constrain their formation pathways. We investigate the formati…
Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs). XIII. Large-scale Feedback and Star Formation in a Low-Luminosity Quasar at z = 7.07 on the Local Black Hole to Host Mass Relation
Takuma Izumi, Yoshiki Matsuoka, Seiji Fujimoto +22
We present ALMA [CII] 158 m line and underlying far-infrared (FIR) continuum emission observations ( resolution) toward HSC J124353.93010038.5 (J1243…
The Sizes of Quasar Host Galaxies with the Hyper Suprime-Cam Subaru Strategic Program
Junyao Li, John D. Silverman, Xuheng Ding +11
The relationship between quasars and their host galaxies provides clues on how supermassive black holes (SMBHs) and massive galaxies are jointly assembled. To elucidate this connec…
Gravitational wave backgrounds from coalescing black hole binaries at cosmic dawn: an upper bound
Kohei Inayoshi, Kazumi Kashiyama, Eli Visbal +1
The successive discoveries of binary merger events by Advanced LIGO-Virgo have been revealing the statistical properties of binary black hole (BBH) populations. A stochastic gravit…
On the Mass Loading of AGN-Driven Outflows in Elliptical Galaxies and Clusters
Yu Qiu, Brian R. McNamara, Tamara Bogdanovic +2
Outflows driven by active galactic nuclei (AGN) are an important channel for accreting supermassive black holes (SMBHs) to interact with their host galaxies and clusters. Propertie…
Subaru High-z Exploration of Low-Luminosity Quasars (SHELLQs) XII. Extended [C II] Structure (Merger or Outflow) in a z = 6.72 Red Quasar
Takuma Izumi, Masafusa Onoue, Yoshiki Matsuoka +31
We present ALMA [C II] 158 m line and far-infrared (FIR) continuum emission observations toward HSC J120505.09000027.9 (J12050000) at with the beam size of $\si…