Tomoaki Ishiyama

1.5k total citations · 1 hit paper
45 papers, 869 citations indexed

About

Tomoaki Ishiyama is a scholar working on Astronomy and Astrophysics, Instrumentation and Nuclear and High Energy Physics. According to data from OpenAlex, Tomoaki Ishiyama has authored 45 papers receiving a total of 869 indexed citations (citations by other indexed papers that have themselves been cited), including 41 papers in Astronomy and Astrophysics, 16 papers in Instrumentation and 15 papers in Nuclear and High Energy Physics. Recurrent topics in Tomoaki Ishiyama's work include Galaxies: Formation, Evolution, Phenomena (36 papers), Cosmology and Gravitation Theories (19 papers) and Astronomy and Astrophysical Research (16 papers). Tomoaki Ishiyama is often cited by papers focused on Galaxies: Formation, Evolution, Phenomena (36 papers), Cosmology and Gravitation Theories (19 papers) and Astronomy and Astrophysical Research (16 papers). Tomoaki Ishiyama collaborates with scholars based in Japan, United States and Germany. Tomoaki Ishiyama's co-authors include Junichiro Makino, Shin’ichiro Ando, Toshiyuki Fukushige, Taira Oogi, Toshikazu Ebisuzaki, Nagisa Hiroshima, Anatoly Klypin, Keigo Nitadori, Francisco Prada and Go Ogiya and has published in prestigious journals such as The Astrophysical Journal, Monthly Notices of the Royal Astronomical Society and Astronomy and Astrophysics.

In The Last Decade

Tomoaki Ishiyama

40 papers receiving 824 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.

The Uchuu simulations: Data Release 1 and dark matter halo concentrations

2021 162 citations Tomoaki Ishiyama, Francisco Prada et al. Monthly Notices of the Royal Astronomical Society profile →

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name	h						Papers	Cites
Tomoaki Ishiyama Japan	15	736	357	215	63	39	45	869
Juliana Kwan United Kingdom	13	575 0.8×	267 0.7×	174 0.8×	59 0.9×	61 1.6×	30	681
Kohji Yoshikawa Japan	17	493 0.7×	176 0.5×	108 0.5×	52 0.8×	35 0.9×	41	587
V. Antonuccio-Delogu Italy	13	416 0.6×	172 0.5×	129 0.6×	39 0.6×	26 0.7×	41	517
K. Begeman Netherlands	6	734 1.0×	287 0.8×	202 0.9×	76 1.2×	15 0.4×	11	828
Peter Berczik Ukraine	26	2.0k 2.7×	150 0.4×	465 2.2×	93 1.5×	35 0.9×	106	2.1k
Douglas H. Rudd United States	9	911 1.2×	339 0.9×	197 0.9×	37 0.6×	7 0.2×	13	1.0k
Matteo Zennaro Spain	20	925 1.3×	348 1.0×	292 1.4×	75 1.2×	97 2.5×	31	999
Antonio D. Montero-Dorta Spain	17	719 1.0×	73 0.2×	420 2.0×	39 0.6×	21 0.5×	42	764
Alessia Gualandris United Kingdom	26	1.6k 2.2×	149 0.4×	335 1.6×	71 1.1×	23 0.6×	49	1.7k
Onsi Fakhouri United States	10	1.1k 1.5×	116 0.3×	655 3.0×	55 0.9×	18 0.5×	10	1.1k

Countries citing papers authored by Tomoaki Ishiyama

Since Specialization

Citations

This map shows the geographic impact of Tomoaki Ishiyama'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 Tomoaki Ishiyama with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Tomoaki Ishiyama more than expected).

Fields of papers citing papers by Tomoaki Ishiyama

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Tomoaki Ishiyama. 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 Tomoaki Ishiyama. The network helps show where Tomoaki Ishiyama may publish in the future.

Co-authorship network of co-authors of Tomoaki Ishiyama

This figure shows the co-authorship network connecting the top 25 collaborators of Tomoaki Ishiyama. A scholar is included among the top collaborators of Tomoaki Ishiyama 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 Tomoaki Ishiyama. Tomoaki Ishiyama 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

Fernández‐García, Elena, J. Betancort‐Rijo, F. Prada, et al.. (2025). Constraining cosmological parameters using void statistics from the SDSS survey. Astronomy and Astrophysics. 695. A19–A19.

Smith, A. G., J. Ereza, César Hernández‐Aguayo, et al.. (2024). The Uchuu–SDSS galaxy light-cones: a clustering, redshift space distortion and baryonic acoustic oscillation study. Monthly Notices of the Royal Astronomical Society. 528(4). 7236–7255. 6 indexed citations

Ishiyama, Tomoaki, et al.. (2023). Performance Evaluation of Parallel Sortings on the Supercomputer Fugaku. Journal of Information Processing. 31(0). 452–458. 2 indexed citations

Hayashi, Kohei, Yutaka Hirai, Masashi Chiba, & Tomoaki Ishiyama. (2023). Dark Matter Halo Properties of the Galactic Dwarf Satellites: Implication for Chemo-dynamical Evolution of the Satellites and a Challenge to Lambda Cold Dark Matter. The Astrophysical Journal. 953(2). 185–185. 11 indexed citations

Oogi, Taira, Tomoaki Ishiyama, Francisco Prada, et al.. (2023). Uchuu–ν2GC galaxies and AGN: cosmic variance forecasts of high-redshift AGN for JWST, Euclid, and LSST. Monthly Notices of the Royal Astronomical Society. 525(3). 3879–3895. 8 indexed citations

Klypin, Anatoly, et al.. (2023). The correlation function and detection of baryon acoustic oscillation peak from the spectroscopic SDSS-GalWCat galaxy cluster catalogue. Monthly Notices of the Royal Astronomical Society Letters. 529(1). L54–L59. 2 indexed citations

Wilson, Gillian, et al.. (2023). Constraining Cosmological Parameters Using the Cluster Mass–Richness Relation. The Astrophysical Journal. 955(1). 26–26. 8 indexed citations

Hiroshima, Nagisa, Shin’ichiro Ando, & Tomoaki Ishiyama. (2022). Semi-analytical frameworks for subhaloes from the smallest to the largest scale. Monthly Notices of the Royal Astronomical Society. 517(2). 2728–2737. 2 indexed citations

Moliné, Ángeles, M. Sánchez‐Conde, Tomoaki Ishiyama, et al.. (2022). ΛCDM halo substructure properties revealed with high-resolution and large-volume cosmological simulations. Monthly Notices of the Royal Astronomical Society. 518(1). 157–173. 23 indexed citations

10.

Aung, Han, Daisuke Nagai, Anatoly Klypin, et al.. (2022). The Uchuu-universe machine data set: galaxies in and around clusters. Monthly Notices of the Royal Astronomical Society. 519(2). 1648–1656. 10 indexed citations

11.

Ishiyama, Tomoaki, Kohji Yoshikawa, & Ataru Tanikawa. (2022). High Performance Gravitational N-body Simulations on Supercomputer Fugaku. 10–17. 3 indexed citations

12.

Ishiyama, Tomoaki, Francisco Prada, Anatoly Klypin, et al.. (2021). The Uchuu simulations: Data Release 1 and dark matter halo concentrations. Monthly Notices of the Royal Astronomical Society. 506(3). 4210–4231. 162 indexed citations breakdown →

13.

Chiba, Masashi, et al.. (2019). Void Formation: Does the Void-in-Cloud Process Matter?. Monthly Notices of the Royal Astronomical Society. 2 indexed citations

14.

Ishiyama, Tomoaki, et al.. (2019). Statistical properties of substructures around Milky Way-sized haloes and their implications for the formation of stellar streams. Monthly Notices of the Royal Astronomical Society. 487(2). 2718–2729. 7 indexed citations

15.

Okamoto, Takashi, Toshihiro Kawaguchi, Masahiro Nagashima, et al.. (2018). The New Numerical Galaxy Catalogue (ν2GC): properties of active galactic nuclei and their host galaxies. Monthly Notices of the Royal Astronomical Society. 482(4). 4846–4873. 19 indexed citations

16.

Hayashi, Kohei, Tomoaki Ishiyama, Go Ogiya, et al.. (2017). Universal Dark Halo Scaling Relation for the Dwarf Spheroidal Satellites. The Astrophysical Journal. 843(2). 97–97. 4 indexed citations

17.

Oogi, Taira, Motohiro Enoki, Tomoaki Ishiyama, et al.. (2017). Imprints of the super-Eddington accretion on the quasar clustering. Monthly Notices of the Royal Astronomical Society Letters. 471(1). L21–L25. 5 indexed citations

18.

Kawaguchi, Toshihiro, et al.. (2017). Theoretical Re-evaluations of Scaling Relations between SMBHs and Their Host Galaxies–2. Importance of AGN Feedback Suggested by Stellar Age–Velocity Dispersion Relation. Frontiers in Astronomy and Space Sciences. 4. 1 indexed citations

19.

Kawaguchi, Toshihiro, Takashi Okamoto, Ryu Makiya, et al.. (2016). Theoretical re-evaluations of the black hole mass–bulge mass relation – I. Effect of seed black hole mass. Monthly Notices of the Royal Astronomical Society. 461(4). 4389–4394. 12 indexed citations

20.

Kawaguchi, Toshihiro, Takashi Okamoto, Ryu Makiya, et al.. (2016). Withdrawn as Duplicate: Theoretical reevaluations of the black hole mass – bulge mass relation - I. Effect of the seed black hole mass. Monthly Notices of the Royal Astronomical Society Letters. 484(1). L97–L97.

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