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Hiroshi Nagai

准教授/Associate Professor

自然科学研究機構国立天文台/National Astronomical Observatory of Japan

Japan

Research Interests

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About

Hiroshi Nagai is an Associate Professor at the National Astronomical Observatory of Japan. His research focuses on astrophysical phenomena, including the study of active galactic nuclei and their relationship with surrounding molecular gas. Recent publications include investigations of the CO absorption line in the M87 nucleus and ALMA observations of gamma-ray binary systems. His work also encompasses the evolution of jets in radio galaxies and extensive surveys of radio-loud quasars.

Articles (23)

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Collaborators (42)

Neil Phillips

European Southern Observatory

GERMANY

Hiroshi Nagai

Research Interests

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Articles (23)

Discovery of CO Clouds Associated with the X-Ray Jets of SS 433: Evidence for Shock–Cloud Interaction Enhancing Nonthermal X-Ray Emission

A Unified Origin of Faraday Rotation toward 3C 84: The Circumnuclear Ambient Medium within the Parsec-scale Bondi Radius of the Host Galaxy NGC 1275

Multiphase Gas Structure in the Circumnuclear Region of NGC 5506 Observed with ALMA

Compact dusty starbursts at cosmic noon linked to high-energy neutrinos

Far-infrared synchrotron properties of the inner lobes of the radio galaxy Centaurus A revealed with the Herschel observatory

Reexamination of the CO Absorption Line in the M87 Nucleus

Monitoring of 3C 286 with ALMA, IRAM, and SMA from 2006 to 2025: Stability, Synchrotron Ages, and Frequency-dependent Polarization Attributed to Core-shift

Evolution of the Termination Region of the Parsec-scale Jet of 3C 84 Over the Past 20 yr

Observational evidence to support a dense ambient medium shaping the jet in 3C 84

The Relationships between Active Galactic Nucleus Power and Molecular Gas Mass within 500 pc of the Center of Elliptical Galaxies

A Giant Metrewave Radio Telescope survey of radio-loud broad absorption line quasars

ALMA Observations of the Gamma-Ray Binary System PSR B1259-63/LS 2883 during the 2024 Periastron Passage

ALMA High-frequency Long-baseline Campaign in 2019: Band 9 and 10 In-band and Band-to-band Observations Using ALMA’s Longest Baselines

The Past and Future of East Asia to Italy: Nearly Global VLBI

ALMA ACA Detection of Submillimeter Emission Associated with the Western Hot Spot of the Radio Galaxy Pictor A

ALMA High-frequency Long Baseline Campaign in 2021: Highest Angular Resolution Submillimeter Wave Images for the Carbon-rich Star R Lep

Collimation of the Relativistic Jet in the Quasar 3C 273

Massive Molecular Gas as a Fuel Tank for Active Galactic Nuclei Feedback In Central Cluster Galaxies

Polarimetric Properties of Event Horizon Telescope Targets from ALMA

Morphological Transition of the Compact Radio Lobe in 3C 84 via the Strong Jet–Cloud Collision

The Explosion in Orion-KL as Seen by Mosaicking the Magnetic Field with ALMA

Diffuse Synchrotron Emission Associated with the Starburst in the Circumnuclear Disk of NGC 1275

Observing the Time Evolution of the Multicomponent Nucleus of 3C 84

Collaborators (42)

Neil Phillips

Hyunwook Ro

Tuomas Savolainen

Alexander Wagner

Iván Agudo

Geoffrey Bower

Gabriele Giovannini

Hidetoshi Sano

Akihiro Doi

Masato Kobayashi

Takuma Izumi

Takafumi Tsukui

Satoko Takahashi

Mahito Sasada

Seiji Kameno

Takayuki Hayashi

Keiichi Wada

Yasuo Fukui

Yutaka Fujita

Kazuhiro Hada

Takao Nakagawa

Kengo Tachihara

Dirk Petry

Shunsuke Baba

Shigeo Kimura

Aviad Levis

Makoto Tashiro

Mami Machida

Bunyo Hatsukade

Kotaro Niinuma

Yoshiharu Asaki

Do-Young Byun

Haruka Sakemi

Akiko Kawachi

Andrew Fabian

Jongho Park

Kiyoaki Wajima

Daniel Marrone

Yusuke MIYAMOTO

Akihiko Hirota

Matteo Stagni

Masanori Nakamura

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