Å. Hjalmarson

2.9k total citations
69 papers, 1.6k citations indexed

About

Å. Hjalmarson is a scholar working on Astronomy and Astrophysics, Spectroscopy and Atmospheric Science. According to data from OpenAlex, Å. Hjalmarson has authored 69 papers receiving a total of 1.6k indexed citations (citations by other indexed papers that have themselves been cited), including 62 papers in Astronomy and Astrophysics, 28 papers in Spectroscopy and 22 papers in Atmospheric Science. Recurrent topics in Å. Hjalmarson's work include Astrophysics and Star Formation Studies (57 papers), Molecular Spectroscopy and Structure (23 papers) and Stellar, planetary, and galactic studies (22 papers). Å. Hjalmarson is often cited by papers focused on Astrophysics and Star Formation Studies (57 papers), Molecular Spectroscopy and Structure (23 papers) and Stellar, planetary, and galactic studies (22 papers). Å. Hjalmarson collaborates with scholars based in Sweden, United States and France. Å. Hjalmarson's co-authors include William M. Irvine, Masatoshi Ohishi, A. Nummelin, Per Friberg, P. Bergman, W. M. Irvine, Shuji Saito, T. J. Millar, M. Ikeda and J. E. Dickens 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

Å. Hjalmarson

64 papers receiving 1.6k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Å. Hjalmarson Sweden 20 1.2k 936 688 545 49 69 1.6k
H. E. Matthews United States 19 883 0.8× 656 0.7× 478 0.7× 368 0.7× 35 0.7× 53 1.2k
F. Baas Netherlands 20 1.1k 1.0× 613 0.7× 446 0.6× 356 0.7× 36 0.7× 54 1.4k
W. M. Irvine United States 18 858 0.7× 753 0.8× 522 0.8× 411 0.8× 30 0.6× 28 1.2k
R. Terzieva United States 10 777 0.7× 516 0.6× 459 0.7× 357 0.7× 34 0.7× 12 987
M. A. Frerking United States 20 1.5k 1.3× 879 0.9× 592 0.9× 554 1.0× 26 0.5× 81 2.0k
S. B. Charnley United States 18 1.1k 0.9× 785 0.8× 548 0.8× 473 0.9× 40 0.8× 36 1.3k
David M. Mehringer United States 23 1.4k 1.2× 900 1.0× 575 0.8× 411 0.8× 37 0.8× 46 1.6k
M. L. Delitsky United States 15 1.5k 1.3× 1.2k 1.2× 376 0.5× 917 1.7× 81 1.7× 37 2.1k
Lewis E. Snyder United States 23 1.5k 1.3× 1.3k 1.4× 1.0k 1.5× 693 1.3× 64 1.3× 57 2.1k
Yi‐Jehng Kuan United States 19 890 0.8× 702 0.8× 531 0.8× 347 0.6× 77 1.6× 41 1.3k

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-authorship network of co-authors of Å. Hjalmarson

This figure shows the co-authorship network connecting the top 25 collaborators of Å. Hjalmarson. A scholar is included among the top collaborators of Å. Hjalmarson 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 Å. Hjalmarson. Å. Hjalmarson 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.
Sandqvist, Aa., Å. Hjalmarson, U. Frisk, et al.. (2016). Odinobservations of ammonia in the Sgr A +50 km s-1cloud and circumnuclear disk. Astronomy and Astrophysics. 599. A135–A135. 1 indexed citations
2.
Biver, N., R. Moreno, D. Bockelée–Morvan, et al.. (2016). Isotopic ratios of H, C, N, O, and S in comets C/2012 F6 (Lemmon) and C/2014 Q2 (Lovejoy). Astronomy and Astrophysics. 589. A78–A78. 60 indexed citations
3.
Persson, C. M., E. S. Wirström, J. H. Black, et al.. (2015). On the accretion process in a high-mass star forming region. Astronomy and Astrophysics. 585. A158–A158. 8 indexed citations
4.
Persson, C. M., G. E. Hassel, A. O. H. Olofsson, et al.. (2014). Upper limits to interstellar NH+and para-NH2−abundances. Astronomy and Astrophysics. 567. A130–A130. 18 indexed citations
5.
Sandqvist, Aa., Å. Hjalmarson, A. Winnberg, et al.. (2013). Hydroxyl, water, ammonia, carbon monoxide, and neutral carbon towards the Sagittarius A complex. Astronomy and Astrophysics. 554. A141–A141. 7 indexed citations
6.
Sandqvist, Aa., Bengt Larsson, Å. Hjalmarson, et al.. (2008). Odin observations of the Galactic centre in the 118-GHz band. Astronomy and Astrophysics. 482(3). 849–853. 13 indexed citations
7.
Wirström, E. S., et al.. (2007). A search for pre-biotic molecules in hot cores. Astronomy and Astrophysics. 473(1). 177–180. 11 indexed citations
8.
Wilson, C. D., R. S. Booth, M. Olberg, et al.. (2007). Upper limits to the water abundance in starburst galaxies. Astronomy and Astrophysics. 469(1). 121–124. 4 indexed citations
9.
Wirström, E. S., P. Bergman, A. O. H. Olofsson, et al.. (2006). Odin CO and $\mathsf{^{13}}$CO J = 5–4 mapping of Orion KL – a step towards accurate water abundances. Astronomy and Astrophysics. 453(3). 979–987. 8 indexed citations
10.
Hjalmarson, Å., P. Bergman, N. Biver, et al.. (2005). Recent astroomy highlights from the Odin satellite. Chalmers Publication Library (Chalmers University of Technology). 6 indexed citations
11.
Encrenaz, P., Carina M. Persson, Å. Hjalmarson, et al.. (2005). Progress in searches for primordial resonant lines using the Odin satellite. 231. 289.
12.
Wilson, C. D., A. O. H. Olofsson, L. Pagani, et al.. (2005). Searching for O2 in the SMC:. Astronomy and Astrophysics. 433(1). L5–L8. 5 indexed citations
13.
Justtanont, K., P. Bergman, Bengt Larsson, et al.. (2005). W Hya through the eye of Odin. Astronomy and Astrophysics. 439(2). 627–633. 26 indexed citations
14.
Minh, Y. C., L. K. Haikala, Å. Hjalmarson, & William M. Irvine. (1998). Are Clouds Collapsing at the 2′ North Position of Sagittarius B2?. The Astrophysical Journal. 498(1). 261–266. 22 indexed citations
15.
Dickens, J. E., William M. Irvine, Masatoshi Ohishi, et al.. (1997). Detection of Interstellar Ethylene Oxide (c‐C2H4O). The Astrophysical Journal. 489(2). 753–757. 123 indexed citations
16.
Irvine, William M., Per Friberg, Å. Hjalmarson, et al.. (1988). Identification of the interstellar cyanomethyl radical (CH2CN) in the molecular clouds TMC-1 and Sagittarius B2. The Astrophysical Journal. 334(2). L107–L107. 69 indexed citations
17.
Irvine, William M. & Å. Hjalmarson. (1986). Observational astrochemistry. Advances in Space Research. 6(12). 227–236. 4 indexed citations
18.
Irvine, William M., F. Peter Schloerb, Å. Hjalmarson, & Eric Herbst. (1985). The chemical state of dense interstellar clouds: an overview.. 579–620. 6 indexed citations
19.
Hjalmarson, Å.. (1985). Recent Onsala Observations Related to Star Formation. Physica Scripta. T11. 59–67. 1 indexed citations
20.
Thaddeus, P., C. A. Gottlieb, Å. Hjalmarson, et al.. (1985). Astronomical identification of the C3H radical. The Astrophysical Journal. 294(1). L49–L49. 113 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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