John A. Regan

3.3k total citations
45 papers, 1.6k citations indexed

About

John A. Regan is a scholar working on Astronomy and Astrophysics, Instrumentation and Nuclear and High Energy Physics. According to data from OpenAlex, John A. Regan has authored 45 papers receiving a total of 1.6k indexed citations (citations by other indexed papers that have themselves been cited), including 43 papers in Astronomy and Astrophysics, 13 papers in Instrumentation and 6 papers in Nuclear and High Energy Physics. Recurrent topics in John A. Regan's work include Galaxies: Formation, Evolution, Phenomena (30 papers), Astrophysical Phenomena and Observations (24 papers) and Astronomy and Astrophysical Research (13 papers). John A. Regan is often cited by papers focused on Galaxies: Formation, Evolution, Phenomena (30 papers), Astrophysical Phenomena and Observations (24 papers) and Astronomy and Astrophysical Research (13 papers). John A. Regan collaborates with scholars based in Ireland, United States and United Kingdom. John A. Regan's co-authors include Martin G. Haehnelt, John Wise, Peter H. Johansson, T. P. Downes, Tirthankar Roy Choudhury, Brian W. O’Shea, Simon C. O. Glover, Britton Smith, Greg L. Bryan and Matteo Viel and has published in prestigious journals such as SHILAP Revista de lepidopterología, The Astrophysical Journal and Monthly Notices of the Royal Astronomical Society.

In The Last Decade

John A. Regan

42 papers receiving 1.4k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
John A. Regan Ireland 20 1.5k 409 305 55 45 45 1.6k
Fabio Pacucci United States 24 1.6k 1.0× 496 1.2× 406 1.3× 68 1.2× 21 0.5× 61 1.6k
Elisabeta Lusso Italy 25 2.1k 1.4× 703 1.7× 437 1.4× 48 0.9× 25 0.6× 68 2.1k
Marc Rafelski United States 25 1.7k 1.1× 319 0.8× 613 2.0× 59 1.1× 33 0.7× 91 1.8k
Daniel J. Whalen United States 23 1.6k 1.1× 429 1.0× 287 0.9× 38 0.7× 20 0.4× 62 1.7k
Eli Visbal United States 20 1.5k 1.0× 599 1.5× 252 0.8× 66 1.2× 37 0.8× 37 1.6k
Laura Blecha United States 21 1.7k 1.1× 308 0.8× 411 1.3× 86 1.6× 40 0.9× 49 1.8k
Fabrizio Brighenti Italy 30 2.4k 1.6× 670 1.6× 506 1.7× 61 1.1× 31 0.7× 81 2.5k
G. I. G. Józsa Germany 24 1.5k 1.0× 279 0.7× 575 1.9× 63 1.1× 43 1.0× 77 1.5k
K. D. Denney United States 21 1.8k 1.2× 633 1.5× 310 1.0× 91 1.7× 41 0.9× 35 1.9k
Anuradha Koratkar United States 24 1.9k 1.3× 585 1.4× 328 1.1× 92 1.7× 22 0.5× 60 2.0k

Countries citing papers authored by John A. Regan

Since Specialization
Citations

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

Fields of papers citing papers by John A. Regan

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by John A. Regan. 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 John A. Regan. The network helps show where John A. Regan may publish in the future.

Co-authorship network of co-authors of John A. Regan

This figure shows the co-authorship network connecting the top 25 collaborators of John A. Regan. A scholar is included among the top collaborators of John A. Regan 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 John A. Regan. John A. Regan is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Regan, John A., Dalip Singh Mehta, Rüdiger Pakmor, et al.. (2026). The SEEDZ Simulations: Methodology and First Results on Massive Black Hole Seeding and Early Galaxy Growth. The Open Journal of Astrophysics. 9.
2.
Regan, John A., et al.. (2025). Predicting the number density of heavy seed massive black holes due to an intense Lyman-Werner field. The Open Journal of Astrophysics. 8. 3 indexed citations
3.
Regan, John A., et al.. (2025). A Heavy Seed Black Hole Mass Function at High Redshift – Prospects for LISA. The Open Journal of Astrophysics. 8. 3 indexed citations
4.
Regan, John A., et al.. (2025). Primordial black holes in cosmological simulations: growth prospects for supermassive black holes. The Open Journal of Astrophysics. 8. 2 indexed citations
5.
Buldgen, G., et al.. (2025). Rotating supermassive Pop III stars on the main sequence. Astronomy and Astrophysics. 701. A262–A262. 2 indexed citations
6.
Regan, John A., et al.. (2024). Heavy black hole seed formation in high-z atomic cooling halos. Astronomy and Astrophysics. 685. A31–A31. 13 indexed citations
7.
Lupi, Alessandro, et al.. (2024). Sustained super-Eddington accretion in high-redshift quasars. Astronomy and Astrophysics. 686. A256–A256. 24 indexed citations
8.
Regan, John A., et al.. (2024). Halo mergers enhance the growth of massive black hole seeds. Astronomy and Astrophysics. 692. A213–A213. 3 indexed citations
9.
Mehta, Dalip Singh, et al.. (2024). Growth of Light-Seed Black Holes in Gas-Rich Galaxies at High Redshift. SHILAP Revista de lepidopterología. 7. 6 indexed citations
10.
Regan, John A., et al.. (2024). Halo mass functions at high redshift. SHILAP Revista de lepidopterología. 7. 1 indexed citations
11.
Regan, John A. & Marta Volonteri. (2024). Massive Black Hole Seeds. SHILAP Revista de lepidopterología. 7. 14 indexed citations
12.
Clark, Paul C., et al.. (2024). Population III star formation: multiple gas phases prevent the use of an equation of state at high densities. SHILAP Revista de lepidopterología. 7. 3 indexed citations
13.
Regan, John A.. (2023). Massive Star Formation in Overdense Regions of the Early Universe. SHILAP Revista de lepidopterología. 6. 15 indexed citations
14.
Wise, John, et al.. (2023). No Tension: JWST Galaxies at z>10 Consistent with Cosmological Simulations. SHILAP Revista de lepidopterología. 6. 18 indexed citations
15.
Regan, John A., et al.. (2023). Critical accretion rates for rapidly growing massive Population III stars. Astronomy and Astrophysics. 677. A155–A155. 16 indexed citations
16.
Pacucci, Fabio, Mar Mezcua, & John A. Regan. (2021). The Active Fraction of Massive Black Holes in Dwarf Galaxies. The Astrophysical Journal. 920(2). 134–134. 23 indexed citations
17.
Regan, John A., et al.. (2020). The Formation of Very Massive Stars in Early Galaxies and Implications for Intermediate Mass Black Holes. SHILAP Revista de lepidopterología. 3(1). 35 indexed citations
18.
Agarwal, Bhaskar, John A. Regan, Ralf S. Klessen, T. P. Downes, & Erik Zackrisson. (2017). An analytic resolution to the competition between Lyman–Werner radiation and metal winds in direct collapse black hole hosts. Monthly Notices of the Royal Astronomical Society. 470(4). 4034–4038. 9 indexed citations
19.
Smith, Britton, Greg L. Bryan, Simon C. O. Glover, et al.. (2016). Grackle: Chemistry and radiative cooling library for astrophysical simulations. Astrophysics Source Code Library. 3 indexed citations
20.
Regan, John A., Peter H. Johansson, & John Wise. (2016). Forming supermassive black hole seeds under the influence of a nearby anisotropic multifrequency source. Monthly Notices of the Royal Astronomical Society. 459(3). 3377–3394. 24 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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