H.-J. Hagen

2.3k citations

41 papers · 721 indexed · h-index 18

Astronomy and Astrophysics top 5%
Instrumentation top 2%
Nuclear and High Energy Physics top 10%
Computational Mechanics
Atomic and Molecular Physics, and Optics

Co-authors: D. Engels D. Reimers W. Voges F. J. Zickgraf A. V. Ugryumov A. Y. Kniazev S. A. Pustilnik Robert A. Baade
Topics: Galaxies: Formation, Evolution, Phenomena (26 papers)Astronomy and Astrophysical Research (24 papers)Stellar, planetary, and galactic studies (15 papers)
Cited by: Instrumentation Astronomy and Astrophysics Nuclear and High Energy Physics
Journals: Nature Astronomy and Astrophysics The Astronomical Journal
Partner nations: Germany Russia Spain

In The Last Decade

H.-J. Hagen

41 papers receiving 699 citations

Peers

Countries citing papers authored by H.-J. Hagen

Since Specialization

Citations

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

Fields of papers citing papers by H.-J. Hagen

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by H.-J. Hagen. 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 H.-J. Hagen. The network helps show where H.-J. Hagen may publish in the future.

Co-authorship network of co-authors of H.-J. Hagen

This figure shows the co-authorship network connecting the top 25 collaborators of H.-J. Hagen. A scholar is included among the top collaborators of H.-J. Hagen 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 H.-J. Hagen. H.-J. Hagen 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

#	Work	Indexed citations
1	Fluctuations of the intergalactic ionization field at redshiftz~ 2 2013 ·Astronomy and Astrophysics ·I. I. Agafonova,S. A. Levshakov,D. Reimers,H.-J. Hagen,David Tytler	4
2	A hydrodynamic study of the circumstellar envelope of α Scorpii⋆ 2012 ·(unknown),Robert A. Baade,D. Reimers,H.-J. Hagen	14
3	The Antares emission nebula and mass loss of $\sf \alpha$ Scorpii A 2008 ·Astronomy and Astrophysics ·D. Reimers,H.-J. Hagen,Robert A. Baade,(unknown)	12
4	Spectral shape of the UV ionizing background and O VI absorbers at z $\mathsf{\sim 1.5}$ towards HS 0747+4259 2006 ·Astronomy and Astrophysics ·D. Reimers,I. I. Agafonova,S. A. Levshakov,H.-J. Hagen,C. Fechner,David Tytler,David Kirkman,Sebastián López	16
5	Optical identification of ROSAT-FSC sources 2006 ·Astronomy and Astrophysics ·A. M. Mickaelian,(unknown),D. Engels,H.-J. Hagen,W. Voges	31
6	Dwarf novae in the Hamburg quasar survey: rarer than expected 2006 ·Astronomy and Astrophysics ·A. Aungwerojwit,B. T. Gänsicke,P. Rodríguez-Gil,H.-J. Hagen,S. Araujo‐Betancor,(unknown),D. Engels,Robert Fried,E. T. Harlaftis,D. Mislis,Daisaku Nogami,P. Schmeer,R. Schwarz,A. Staude,M. A. P. Torres	24
7	Intergalactic HeII absorption towards QSO 1157+3143 2005 ·Springer Link (Chiba Institute of Technology) ·D. Reimers,C. Fechner,H.-J. Hagen,P. Jakobsen,David Tytler,David Kirkman	24
8	HS 0943+1404, a true intermediate polar 2005 ·Astronomy and Astrophysics ·P. Rodríguez-Gil,B. T. Gänsicke,H.-J. Hagen,Daisaku Nogami,M. A. P. Torres,H. J. Lehto,A. Aungwerojwit,S. P. Littlefair,S. Araujo‐Betancor,D. Engels	18
9	HS 0139+0559, HS 0229+8016, HS 0506+7725, and HS 0642+5049: four new long-period cataclysmic variables 2005 ·Astronomy and Astrophysics ·A. Aungwerojwit,B. T. Gänsicke,P. Rodríguez-Gil,H.-J. Hagen,E. T. Harlaftis,Christos Papadimitriou,H. J. Lehto,S. Araujo‐Betancor,U. Heber,Robert Fried,D. Engels,S. Katajainen	25
10	The EUV variability of the luminous QSO HS 1700+6416 2005 ·Astronomy and Astrophysics ·D. Reimers,H.-J. Hagen,(unknown),G. A. Kriss,J. Michael Shull	10
11	Spectral analysis of sdB stars from the Hamburg Quasar Survey 2003 ·Springer Link (Chiba Institute of Technology) ·H. Edelmann,U. Heber,H.-J. Hagen,Michael Lemke,S. Dreizler,R. Napiwotzki,D. Engels	63
12	SPY - the ESO Supernovae type Ia Progenitor survey 2003 ·University of Hertfordshire Research Archive (University of Hertfordshire) ·R. Napiwotzki,N. Christlieb,H. Drechsel,H.-J. Hagen,U. Heber,D. Homeier,C. Karl,D. Koester,B. Leibundgut,T. R. Marsh,S. Moehler,G. Nelemans,E.-M. Pauli,D. Reimers,A. Renzini,L. R. Yungelson	51
13	The Hamburg/RASS Catalogue of optical identifications 2003 ·Astronomy and Astrophysics ·F. J. Zickgraf,D. Engels,H.-J. Hagen,D. Reimers,W. Voges	58
14	Discovery of a newquadruply lensed QSO: HS 0810+2554 – A brighter twin to PG 1115+080 2002 ·Astronomy and Astrophysics ·D. Reimers,H.-J. Hagen,Robert A. Baade,Sebastián López,David Tytler	22
15	The Hamburg/SAO survey for emission-line galaxies 2001 ·Astronomy and Astrophysics ·A. Y. Kniazev,D. Engels,S. A. Pustilnik,A. V. Ugryumov,(unknown),(unknown),N. Brosch,H.-J. Hagen,U. Hopp,Y. I. Izotov,V. A. Lipovetsky,J. Masegosa,I. Márquez,Jean‐Michel Martin	11
16	High-resolution OVI absorption line observations at1.2 $ \leq z \leq $ 1.7 in the bright QSO HE 0515-4414 2001 ·Astronomy and Astrophysics ·D. Reimers,Robert A. Baade,H.-J. Hagen,Sebastián López	17
17	The Hamburg/SAO survey for emission-line galaxies 2001 ·Astronomy and Astrophysics ·A. V. Ugryumov,D. Engels,A. Y. Kniazev,R. F. Green,Y. I. Izotov,U. Hopp,S. A. Pustilnik,(unknown),(unknown),N. Brosch,H.-J. Hagen,V. A. Lipovetsky,J. Masegosa,I. Márquez,Jean‐Michel Martin	13
18	The Hamburg-CfA Quasar Survey 1996 ·AAS ·A. Dobrzycki,D. Engels,H.-J. Hagen,M. Elvis,J. Huchra,D. Reimers	1
19	The Hamburg Quasar Survey. I. Schmidt observations and plate digitization. 1995 ·Astronomy & Astrophysics Supplement Series ·H.-J. Hagen,(unknown),D. Engels,D. Reimers	10
20	Emission-line galaxies in the Hamburg quasar survey 1993 ·Astronomy & Astrophysics Supplement Series ·(unknown),D. Engels,H.-J. Hagen,(unknown),L. Wisotzki,(unknown),D. Reimers	2

About H.-J. Hagen

H.-J. Hagen is a scholar working on Instrumentation, Astronomy and Astrophysics and Computational Mechanics, having authored 41 papers that have together received 721 indexed citations. Recurring topics across this work include Galaxies: Formation, Evolution, Phenomena (26 papers), Astronomy and Astrophysical Research (24 papers) and Stellar, planetary, and galactic studies (15 papers). The work is most often cited by research in Instrumentation (259 citations), Astronomy and Astrophysics (712 citations) and Nuclear and High Energy Physics (120 citations). H.-J. Hagen has collaborated with scholars based in Germany, Russia and Spain. Frequent co-authors include D. Engels, D. Reimers, W. Voges, F. J. Zickgraf, A. V. Ugryumov, A. Y. Kniazev, S. A. Pustilnik, Robert A. Baade, U. Heber and R. Napiwotzki. Their work appears in journals such as Nature, Astronomy and Astrophysics and The Astronomical Journal.

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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