Kohei Ichikawa

2.7k total citations · 1 hit paper
72 papers, 900 citations indexed

About

Kohei Ichikawa is a scholar working on Astronomy and Astrophysics, Nuclear and High Energy Physics and Organic Chemistry. According to data from OpenAlex, Kohei Ichikawa has authored 72 papers receiving a total of 900 indexed citations (citations by other indexed papers that have themselves been cited), including 56 papers in Astronomy and Astrophysics, 11 papers in Nuclear and High Energy Physics and 8 papers in Organic Chemistry. Recurrent topics in Kohei Ichikawa's work include Galaxies: Formation, Evolution, Phenomena (43 papers), Astrophysical Phenomena and Observations (34 papers) and Astrophysics and Star Formation Studies (22 papers). Kohei Ichikawa is often cited by papers focused on Galaxies: Formation, Evolution, Phenomena (43 papers), Astrophysical Phenomena and Observations (34 papers) and Astrophysics and Star Formation Studies (22 papers). Kohei Ichikawa collaborates with scholars based in Japan, United States and Chile. Kohei Ichikawa's co-authors include Eiichi Fujita, Kaoru Fuji, Manabu Node, Kohei Inayoshi, Yoshihiro Ueda, Cláudio Ricci, A. Alonso‐Herrero, Masatoshi Imanishi, C. Packham and Enrique López-Rodríguez and has published in prestigious journals such as The Astrophysical Journal, International Journal of Molecular Sciences and Monthly Notices of the Royal Astronomical Society.

In The Last Decade

Kohei Ichikawa

63 papers receiving 792 citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Little Red Dots: Rapidly Growing Black Holes Reddened by Extended Dusty Flows

2025 27 citations Zhengrong Li, Kohei Inayoshi et al. The Astrophysical Journal profile →

Peers

Kohei Ichikawa

NHEP

INSTR

Eric D. Miller United States

Josefin Larsson Sweden

Kunihiko Tanaka Japan

M. Y. Fujimoto Japan

M. Grenon Switzerland

Y. Wang Germany

M. Gómez Chile

Ayesha Begum India

Rubén Díaz Argentina

Eric D. Miller United States

Kohei Ichikawa

773 ×1.2

241 ×1.4

NHEP

77 ×0.5

88 ×1.0

234 ×2.8

INSTR

Citations per year, relative to Kohei Ichikawa Kohei Ichikawa (= 1×) peers Eric D. Miller

Countries citing papers authored by Kohei Ichikawa

Since Specialization

Citations

This map shows the geographic impact of Kohei Ichikawa's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Kohei Ichikawa with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Kohei Ichikawa more than expected).

Fields of papers citing papers by Kohei Ichikawa

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Kohei Ichikawa. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Kohei Ichikawa. The network helps show where Kohei Ichikawa may publish in the future.

Co-authorship network of co-authors of Kohei Ichikawa

This figure shows the co-authorship network connecting the top 25 collaborators of Kohei Ichikawa. A scholar is included among the top collaborators of Kohei Ichikawa based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Kohei Ichikawa. Kohei Ichikawa is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Trakhtenbrot, Benny, Cláudio Ricci, F. E. Bauer, et al.. (2025). BASS. XLVIII. [Ne V] λ3427 Emission in Powerful Nearby Active Galactic Nuclei. The Astrophysical Journal. 989(1). 88–88.

Li, Zhengrong, et al.. (2025). Little Red Dots: Rapidly Growing Black Holes Reddened by Extended Dusty Flows. The Astrophysical Journal. 980(1). 36–36. 27 indexed citations breakdown →

Inayoshi, Kohei & Kohei Ichikawa. (2024). Birth of Rapidly Spinning, Overmassive Black Holes in the Early Universe. The Astrophysical Journal Letters. 973(2). L49–L49. 22 indexed citations

Akiyama, Masayuki, Malte Schramm, Yoshihiro Ueda, et al.. (2024). Observational properties of active galactic nucleus obscuration during the peak of accretion growth. Monthly Notices of the Royal Astronomical Society. 529(4). 3610–3629. 2 indexed citations

Yamada, Satoshi, Yoshihiro Ueda, T. Kawamuro, et al.. (2024). [O iv]- and [Ne v]-weak Active Galactic Nuclei Hidden by Compton-thick Material in Late Mergers. The Astrophysical Journal. 965(2). 153–153. 3 indexed citations

He, Wanqiu, Masayuki Akiyama, Motohiro Enoki, et al.. (2024). Black Hole Mass and Eddington-ratio Distributions of Less-luminous Quasars at z ∼ 4 in the Subaru Hyper Suprime-Cam Wide Field. The Astrophysical Journal. 962(2). 152–152. 10 indexed citations

Lyu, Zeyu, et al.. (2023). Digitization of weather records ofSeungjeongwon Ilgi: A historical weather dynamics dataset of the Korean Peninsula in 1623–1910. Geoscience Data Journal.

Nishiyama, Shogo, B. Thorsbro, Hiromi Saida, et al.. (2023). Origin of an orbiting star around the galactic supermassive black hole. Proceedings of the Japan Academy Series B. 100(1). 86–99. 2 indexed citations

Li, Junyao, J. D. Silverman, A. Merloni, et al.. (2023). The eROSITA final equatorial-depth survey (eFEDS): host-galaxy demographics of X-ray AGNs with Subaru Hyper Suprime-Cam. Monthly Notices of the Royal Astronomical Society. 527(3). 4690–4704. 5 indexed citations

10.

Uchiyama, Hisakazu, Takuji Yamashita, Jun Toshikawa, et al.. (2022). A Wide and Deep Exploration of Radio Galaxies with Subaru HSC (WERGS). VI. Distant Filamentary Structures Pointed Out by High-z Radio Galaxies at z ∼ 4. The Astrophysical Journal. 926(1). 76–76. 6 indexed citations

11.

Pfeifle, Ryan W., Cláudio Ricci, Peter Boorman, et al.. (2022). BASS. XXIII. A New Mid-infrared Diagnostic for Absorption in Active Galactic Nuclei. The Astrophysical Journal Supplement Series. 261(1). 3–3. 11 indexed citations

12.

Nagao, Tohru, Yoshiki Toba, Kohei Ichikawa, et al.. (2022). Extreme Nature of Four Blue-excess Dust-obscured Galaxies Revealed by Optical Spectroscopy. The Astrophysical Journal. 941(2). 195–195. 8 indexed citations

13.

Nikutta, Robert, Enrique López-Rodríguez, Kohei Ichikawa, et al.. (2021). Hypercubes of AGN Tori (HYPERCAT). I. Models and Image Morphology. The Astrophysical Journal. 919(2). 136–136. 8 indexed citations

14.

Nikutta, Robert, Enrique López-Rodríguez, Kohei Ichikawa, et al.. (2021). Hypercubes of AGN Tori (HYPERCAT). II. Resolving the Torus with Extremely Large Telescopes. The Astrophysical Journal. 923(1). 127–127. 7 indexed citations

15.

Akiyama, Masayuki, Kohei Ichikawa, Hirofumi Noda, et al.. (2020). Tracing the Coevolution Path of Supermassive Black Holes and Spheroids with AKARI-selected Ultraluminous IR Galaxies at Intermediate Redshifts. The Astrophysical Journal. 900(1). 51–51. 6 indexed citations

16.

Inayoshi, Kohei, Kohei Ichikawa, & Luis C. Ho. (2020). Universal Transition Diagram from Dormant to Actively Accreting Supermassive Black Holes. The Astrophysical Journal. 894(2). 141–141. 11 indexed citations

17.

Fuller, Lindsay, Enrique López-Rodríguez, C. Packham, et al.. (2018). SOFIA/FORCAST resolves 30–40 μm extended dust emission in nearby active galactic nuclei. Monthly Notices of the Royal Astronomical Society. 483(3). 3404–3419. 8 indexed citations

18.

López-Rodríguez, Enrique, Lindsay Fuller, A. Alonso‐Herrero, et al.. (2018). The Emission and Distribution of Dust of the Torus of NGC 1068. The Astrophysical Journal. 859(2). 99–99. 29 indexed citations

19.

Ichikawa, Kohei & Ryo Tazaki. (2017). Cooling Timescale of Dust Tori in Dying Active Galactic Nuclei. The Astrophysical Journal. 844(1). 21–21. 10 indexed citations

20.

García-Bernete, I., C. Ramos Almeida, J. A. Acosta‐Pulido, et al.. (2016). The nuclear and extended mid-infrared emission of Seyfert galaxies. Monthly Notices of the Royal Astronomical Society. 463(4). 3531–3555. 16 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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