Fred Hamann

7.5k total citations
112 papers, 4.3k citations indexed

About

Fred Hamann is a scholar working on Astronomy and Astrophysics, Instrumentation and Nuclear and High Energy Physics. According to data from OpenAlex, Fred Hamann has authored 112 papers receiving a total of 4.3k indexed citations (citations by other indexed papers that have themselves been cited), including 103 papers in Astronomy and Astrophysics, 24 papers in Instrumentation and 20 papers in Nuclear and High Energy Physics. Recurrent topics in Fred Hamann's work include Galaxies: Formation, Evolution, Phenomena (76 papers), Astrophysical Phenomena and Observations (50 papers) and Astrophysics and Star Formation Studies (47 papers). Fred Hamann is often cited by papers focused on Galaxies: Formation, Evolution, Phenomena (76 papers), Astrophysical Phenomena and Observations (50 papers) and Astrophysics and Star Formation Studies (47 papers). Fred Hamann collaborates with scholars based in United States, Canada and Germany. Fred Hamann's co-authors include G. J. Ferland, K. T. Korista, M. Dietrich, S. E. Persson, V. T. Junkkarinen, T. A. Barlow, Joseph C. Shields, C. Warner, Paola Rodríguez Hidalgo and J. A. Baldwin and has published in prestigious journals such as The Astrophysical Journal, Monthly Notices of the Royal Astronomical Society and The Astrophysical Journal Supplement Series.

In The Last Decade

Fred Hamann

106 papers receiving 4.1k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Fred Hamann United States 40 4.1k 824 623 136 100 112 4.3k
E. Sturm Germany 39 4.9k 1.2× 1.3k 1.5× 697 1.1× 150 1.1× 126 1.3× 95 5.0k
Joseph C. Shields United States 33 3.5k 0.8× 882 1.1× 649 1.0× 146 1.1× 58 0.6× 93 3.6k
B. T. Soifer United States 31 4.4k 1.1× 1.4k 1.7× 733 1.2× 261 1.9× 170 1.7× 94 4.6k
S. Gallerani Italy 36 3.1k 0.8× 954 1.2× 489 0.8× 79 0.6× 65 0.7× 94 3.2k
C. M. Gaskell United States 30 3.0k 0.7× 640 0.8× 729 1.2× 139 1.0× 25 0.3× 100 3.1k
D. M. Crenshaw United States 41 4.6k 1.1× 651 0.8× 1.2k 2.0× 201 1.5× 33 0.3× 142 4.7k
M. S. Oey United States 33 4.7k 1.1× 1.4k 1.7× 714 1.1× 112 0.8× 89 0.9× 94 4.8k
Roberto Decarli Germany 35 4.0k 1.0× 1.1k 1.4× 944 1.5× 110 0.8× 56 0.6× 147 4.2k
F. Mannucci Italy 36 4.8k 1.2× 1.6k 2.0× 705 1.1× 88 0.6× 80 0.8× 125 5.0k
N. A. Levenson United States 31 3.3k 0.8× 591 0.7× 679 1.1× 130 1.0× 148 1.5× 102 3.4k

Countries citing papers authored by Fred Hamann

Since Specialization
Citations

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

Fields of papers citing papers by Fred Hamann

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Fred Hamann

This figure shows the co-authorship network connecting the top 25 collaborators of Fred Hamann. A scholar is included among the top collaborators of Fred Hamann 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 Fred Hamann. Fred Hamann 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.
Liu, Weizhe, Sylvain Veilleux, Gabriela Canalizo, et al.. (2024). Fast Outflows and Luminous He ii Emission in Dwarf Galaxies with Active Galactic Nuclei (AGN). The Astrophysical Journal. 965(2). 152–152. 5 indexed citations
2.
Yi, Weimin, et al.. (2024). Tracking Outflow Using Line Locking (TOLL). I. The Case Study of Quasar J221531-174408. The Astrophysical Journal. 975(2). 233–233. 1 indexed citations
3.
Gillette, Jarred, Marie Wingyee Lau, Fred Hamann, et al.. (2023). Compact and quiescent circumgalactic medium and Ly α haloes around extremely red quasars. Monthly Notices of the Royal Astronomical Society. 526(2). 2578–2595. 1 indexed citations
4.
Veilleux, Sylvain, David S. N. Rupke, Weizhe Liu, et al.. (2022). Galactic Winds across the Gas-rich Merger Sequence. I. Highly Ionized N v and O vi Outflows in the QUEST Quasars*. The Astrophysical Journal. 926(1). 60–60. 7 indexed citations
5.
Kraemer, S. B., Travis C. Fischer, D. M. Crenshaw, et al.. (2020). Hubble Space Telescope observations of [O iii] emission in nearby QSO2s: physical properties of the ionized outflows. Monthly Notices of the Royal Astronomical Society. 500(1). 1491–1504. 20 indexed citations
6.
Hamann, Fred, et al.. (2019). Nature and Origins of Rich Complexes of C iv Associated Absorption Lines. The Astrophysical Journal. 887(1). 78–78. 5 indexed citations
7.
Hamann, Fred, Todd M. Tripp, David S. N. Rupke, & Sylvain Veilleux. (2019). On the emergence of thousands of absorption lines in the quasar PG 1411+442: a clumpy high-column density outflow from the broad emission-line region?. Monthly Notices of the Royal Astronomical Society. 487(4). 5041–5061. 13 indexed citations
8.
Hwang, Hsiang-Chih, Nadia L. Zakamska, Rachael Alexandroff, et al.. (2018). Winds as the origin of radio emission in z = 2.5 radio-quiet extremely red quasars. Monthly Notices of the Royal Astronomical Society. 477(1). 830–844. 48 indexed citations
9.
Finn, Charles W., S. L. Morris, Neil H. M. Crighton, et al.. (2014). A compact, metal-rich, kpc-scale outflow in FBQS J0209−0438: detailed diagnostics from HST/COS extreme UV observations. Monthly Notices of the Royal Astronomical Society. 440(4). 3317–3340. 21 indexed citations
10.
Capellupo, Daniel M., Fred Hamann, & T. A. Barlow. (2014). A variable P舁v broad absorption line and quasar outflow energetics. Monthly Notices of the Royal Astronomical Society. 444(2). 1893–1900. 27 indexed citations
11.
Chartas, G., Fred Hamann, & Karen M. Leighly. (2012). AGN Winds in Charleston. 460. 3 indexed citations
12.
Hamann, Fred, Nissim Kanekar, J. X. Prochaska, et al.. (2010). A high-velocity narrow absorption line outflow in the quasar J212329.46 − 005052.9. Monthly Notices of the Royal Astronomical Society. no–no. 93 indexed citations
13.
Martin, John C., Kris Davidson, Fred Hamann, O. Stahl, & K. Weis. (2006). Variable Unidentified Emission near 6307 Å in η Carinae. Publications of the Astronomical Society of the Pacific. 118(843). 697–705. 9 indexed citations
14.
Bayol, F., et al.. (2004). Aluminum K-shell radiation from 800 ns implosion time nested wire arrays. First results on the 1 MJ SPHINX generator. International Conference on High-Power Particle Beams. 714–717.
15.
Smith, Nathan, Jon A. Morse, T. R. Gull, et al.. (2004). Kinematics and Ultraviolet to Infrared Morphology of the Inner Homunculus of η Carinae. The Astrophysical Journal. 605(1). 405–424. 46 indexed citations
16.
Dietrich, M., I. Appenzeller, Fred Hamann, et al.. (2003). . Springer Link (Chiba Institute of Technology). 24 indexed citations
17.
Dietrich, M., Fred Hamann, I. Appenzeller, & M. Vestergaard. (2003). Feii/MgiiEmission‐Line Ratio in High‐Redshift Quasars. The Astrophysical Journal. 596(2). 817–829. 85 indexed citations
18.
Hamann, Fred, T. A. Barlow, V. T. Junkkarinen, & E. M. Burbidge. (1997). High‐Resolution Spectra of Intrinsic Absorption Lines in the Quasi‐stellar Object UM 675. The Astrophysical Journal. 478(1). 80–86. 124 indexed citations
19.
Ferland, G. J., J. A. Baldwin, K. T. Korista, et al.. (1996). High Metal Enrichments in Luminous Quasars. The Astrophysical Journal. 461. 683–683. 66 indexed citations
20.
Hamann, Fred. (1994). Emission-line studies of young stars. 4: The optical forbidden lines. The Astrophysical Journal Supplement Series. 93. 485–485. 99 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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