Å. Hjalmarson

2.9k citations

88 papers · 1.8k · h-index 22

Impact in

Astronomy and Astrophysics top 2%
- Astrophysics and Star Formation Studies
- Stellar, planetary, and galactic studies
- Astro and Planetary Science
Spectroscopy top 0.5%
- Molecular Spectroscopy and Structure
- Spectroscopy and Laser Applications

Papers in

Astronomy and Astrophysics 75
- Astrophysics and Star Formation Studies 67
- Stellar, planetary, and galactic studies 23
- Astro and Planetary Science 20
Spectroscopy 39
- Molecular Spectroscopy and Structure 27
- Spectroscopy and Laser Applications 12

Co-authors: William M. Irvine (16 shared papers)Per Friberg (9 shared papers)Masatoshi Ohishi (5 shared papers)A. Nummelin (4 shared papers)P. Bergman (16 shared papers)W. M. Irvine (5 shared papers)Shuji Saito (3 shared papers)T. J. Millar (5 shared papers)
Journals: The Astrophysical Journal (16 papers)Astronomy and Astrophysics (15 papers)Advances in Space Research (4 papers)The Astrophysical Journal Supplement Series (3 papers)Icarus (2 papers)
Partner nations: Sweden United States France

In The Last Decade

Å. Hjalmarson

79 papers receiving 1.8k citations

Peers

Countries citing papers authored by Å. Hjalmarson

Since Specialization

Citations

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

Fields of papers citing papers by Å. Hjalmarson

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authors

The 25 scholars most cited alongside Å. Hjalmarson, linked wherever they have co-authored with each other. Click a name or a connecting line to browse the papers they share.

Border = papers with Å. Hjalmarson Line = papers co-authored together Å. Hjalmarson links everyone, so they are left out of the graph.

All Works

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20 of 20 papers shown

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#	Work
1	A Three‐Position Spectral Line Survey of Sagittarius B2 between 218 and 263 GHz. II. Data Analysis The Astrophysical Journal Supplement Series ·A. Nummelin, P. Bergman, Å. Hjalmarson, Per Friberg, W. M. Irvine, T. J. Millar, Masatoshi Ohishi, Shuji Saito	2000	213
2	Survey Observations of c‐C₂H₄O and CH₃CHO toward Massive Star‐forming Regions The Astrophysical Journal ·M. Ikeda, Masatoshi Ohishi, A. Nummelin, J. E. Dickens, P. Bergman, Å. Hjalmarson, W. M. Irvine	2001	133
3	Detection of Interstellar Ethylene Oxide (c‐C₂H₄O) The Astrophysical Journal ·J. E. Dickens, William M. Irvine, Masatoshi Ohishi, M. Ikeda, Shogo Ishikawa, A. Nummelin, Å. Hjalmarson	1997	127
4	Astronomical identification of the C3H radical The Astrophysical Journal ·P. Thaddeus, C. A. Gottlieb, Å. Hjalmarson, L. E. B. Johansson, William M. Irvine, Per Friberg, R. A. Linke	1985	123
5	A Three‐Position Spectral Line Survey of Sagittarius B2 between 218 and 263 GHz. I. The Observational Data The Astrophysical Journal Supplement Series ·A. Nummelin, P. Bergman, Å. Hjalmarson, Per Friberg, William M. Irvine, T. J. Millar, Masatoshi Ohishi, Shuji Saito	1998	98
6	The HCO(+)/HOC(+) abundance ratio in molecular clouds The Astrophysical Journal ·R. Claude Woods, Christopher S. Gudeman, R. L. Dickman, P. F. Goldsmith, G. R. Huguenin, William M. Irvine, Å. Hjalmarson, L.-Å. Nyman, H. Olofsson	1983	95
7	Identification of the interstellar cyanomethyl radical (CH2CN) in the molecular clouds TMC-1 and Sagittarius B2 The Astrophysical Journal ·William M. Irvine, Per Friberg, Å. Hjalmarson, Shogo Ishikawa, Norio Kaifu, Kenichi Kawaguchi, S. C. Madden, H. E. Matthews, Masatoshi Ohishi, Shuji Saito, Hiroshi Suzuki, P. Thaddeus, B. E. Turner, Satoshi Yamamoto, L. M. Ziurys	1988	74
8	Submillimetre observations of comets with Odin: 2001–2005 Planetary and Space Science ·N. Biver, D. Bockelée–Morvan, J. Crovisier, A. Lecacheux, U. Frisk, Å. Hjalmarson, Michael Olberg, H.-G. Florén, Å. Sandqvist, Sun Kwok	2007	63
9	Isotopic ratios of H, C, N, O, and S in comets C/2012 F6 (Lemmon) and C/2014 Q2 (Lovejoy) Astronomy and Astrophysics ·N. Biver, R. Moreno, D. Bockelée–Morvan, Aa. Sandqvist, P. Colom, J. Crovisier, D. C. Lis, J. Boissier, V. Debout, G. Paubert, Stefanie N. Milam, Å. Hjalmarson, Stefan Lundin, Torgny Karlsson, M. Battelino, U. Frisk, D. Murtagh, (unknown)	2016	62
10	A search for interstellar glycine Monthly Notices of the Royal Astronomical Society ·R. D. Brown, Peter D. Godfrey, J. W. V. Storey, Marie-Paule Bassez, B. J. Robinson, R. Batchelor, MacCrae G. McCulloch, O. E. H. Rydbeck, Å. Hjalmarson	1979	58
11	Variations in the HCN/HNC abundance ratio in the Orion molecular cloud The Astrophysical Journal ·Paul F. Goldsmith, W. M. Irvine, Å. Hjalmarson, J. Elldér	1986	58
12	Interstellar C3N - Detection in Taurus dark clouds The Astrophysical Journal ·Per Friberg, Å. Hjalmarson, M. Guélin, William M. Irvine	1980	54
13	Radio observations of Comet 9P/Tempel 1 before and after Deep Impact Icarus ·N. Biver, D. Bockelée–Morvan, J. Boissier, Jacques Crovisier, P. Colom, A. Lecacheux, R. Moreno, G. Paubert, D. C. Lis, Matthew Sumner, U. Frisk, Å. Hjalmarson, Michael Olberg, A. Winnberg, Hans-Gustav Florén, Å. Sandqvist, Sun Kwok	2006	46
14	Chemical Abundances in Molecular Clouds Astrophysics and space science library ·William M. Irvine, P. F. Goldsmith, Å. Hjalmarson	1987	41
15	The Odin satellite Astronomy and Astrophysics ·M. Olberg, U. Frisk, A. Lecacheux, A. O. H. Olofsson, Philippe Baron, P. Bergman, Gunnar Florin, Å. Hjalmarson, Bengt Larsson, D. Murtagh, G. Olofsson, L. Pagani, Aa. Sandqvist, D. Teyssier, S. Torchinsky, Kevin Volk	2003	39
16	Radio observations of interstellar CH. I The Astrophysical Journal Supplement Series ·O. E. H. Rydbeck, E. Kollberg, Å. Hjalmarson, A. Sume, J. Elldér, W. M. Irvine	1976	38
17	Hyperfine structure of interstellar ammonia in dark clouds The Astrophysical Journal ·O. E. H. Rydbeck, A. Sume, Å. Hjalmarson, J. Elldér, B. O. Rönnäng, E. Kollberg	1977	33
18	W Hya through the eye of Odin Astronomy and Astrophysics ·K. Justtanont, P. Bergman, Bengt Larsson, H. Olofsson, F. L. Schöier, U. Frisk, T. Hasegawa, Å. Hjalmarson, Sun Kwok, M. Olberg, Aa. Sandqvist, Kevin Volk, Moshe Elitzur	2005	28
19	W Hya through the eye of Odin Satellite observations of circumstellar submillimetre H$_2$O line emission ArXiv.org ·K. Justtanont, P. Bergman, Bengt Larsson, H. Olofsson, F. L. Schöier, U. Frisk, T. Hasegawa, Å. Hjalmarson, Sun Kwok, Michael Olberg, Aa. Sandqvist, Kevin Volk, Moshe Elitzur	2005	24
20	Thermal SiO as a probe of high velocity motions in regions of star formation The Astrophysical Journal ·D. Downes, R. Genzel, Å. Hjalmarson, L. Å. Nyman, B. O. Rönnäng	1982	23

About Å. Hjalmarson

Å. Hjalmarson is a scholar working on Astronomy and Astrophysics, Spectroscopy, Atmospheric Science, Atomic and Molecular Physics, and Optics and Aerospace Engineering, having authored 88 papers that have together received 1.8k indexed citations. Recurring topics across this work include Astrophysics and Star Formation Studies (67 papers), Atmospheric Ozone and Climate (28 papers), Molecular Spectroscopy and Structure (27 papers), Stellar, planetary, and galactic studies (23 papers), Astro and Planetary Science (20 papers), Spectroscopy and Laser Applications (12 papers), Advanced Chemical Physics Studies (9 papers) and Atomic and Molecular Physics (7 papers). The work is most often cited by research in Astronomy and Astrophysics (1.3k citations), Spectroscopy (1.0k citations), Atmospheric Science (593 citations), Atomic and Molecular Physics, and Optics (762 citations) and Instrumentation (20 citations). Å. Hjalmarson has collaborated with scholars based in Sweden, United States and France. Frequent co-authors include William M. Irvine, Per Friberg, Masatoshi Ohishi, A. Nummelin, P. Bergman, W. M. Irvine, Shuji Saito, T. J. Millar, J. Elldér and O. E. H. Rydbeck. Their work appears in journals such as The Astrophysical Journal, Astronomy and Astrophysics, Advances in Space Research, The Astrophysical Journal Supplement Series and Icarus.

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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