J. Harju

1.9k citations

61 papers · 938 indexed · h-index 20

Astronomy and Astrophysics top 2%
Spectroscopy top 2%
Atmospheric Science top 5%
Atomic and Molecular Physics, and Optics top 10%
Fluid Flow and Transfer Processes top 10%

Co-authors: P. Caselli O. Sipilä M. Juvela L. K. Haikala K. Lehtinen Stephan Śchlemmer O. Miettinen L. Bizzocchi
Topics: Astrophysics and Star Formation Studies (55 papers)Stellar, planetary, and galactic studies (35 papers)Molecular Spectroscopy and Structure (25 papers)
Cited by: Astronomy and Astrophysics Spectroscopy Atmospheric Science
Journals: Nature The Astrophysical Journal Astronomy and Astrophysics
Partner nations: Finland Germany France

In The Last Decade

J. Harju

58 papers receiving 894 citations

Peers

Countries citing papers authored by J. Harju

Since Specialization

Citations

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

Fields of papers citing papers by J. Harju

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of J. Harju

This figure shows the co-authorship network connecting the top 25 collaborators of J. Harju. A scholar is included among the top collaborators of J. Harju 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 J. Harju. J. Harju 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	Hunting pre-stellar cores with APEX IRAS16293E (Oph464) 2025 ·Astronomy and Astrophysics ·(unknown),E. Redaelli,(unknown),O. Sipilä,J. Harju,François Lique,D. Arzoumanian,J. E. Pineda,(unknown),(unknown)	5
2	Hunting pre-stellar cores with APEX: Corona Australis 151, the densest pre-stellar core or the youngest protostar? 2025 ·Astronomy and Astrophysics ·E. Redaelli,S. Spezzano,P. Caselli,J. Harju,D. Arzoumanian,O. Sipilä,А. Беллоче,(unknown),J. E. Pineda	1
3	Statistical nuclear spin ratios of deuterated ammonia in the pre-stellar core L1544 2025 ·Astronomy and Astrophysics ·J. Harju,P. Caselli,O. Sipilä,(unknown),А. Беллоче,L. Bizzocchi,J. E. Pineda,E. Redaelli,(unknown)	0
4	A low cosmic-ray ionisation rate in the pre-stellar core Ophiuchus/H-MM1 2024 ·Astronomy and Astrophysics ·J. Harju,C. Vastel,O. Sipilä,E. Redaelli,P. Caselli,J. E. Pineda,А. Беллоче,F. Wyrowski	2
5	Initial conditions of star formation at ≲2000 au: Physical structure and NH₃ depletion of three early-stage cores 2023 ·Astronomy and Astrophysics ·Yiguang Lin,S. Spezzano,J. E. Pineda,J. Harju,A. Schmiedeke,Shunshan Jiao,(unknown),P. Caselli	3
6	Methanol Mapping in Cold Cores: Testing Model Predictions* 2022 ·The Astrophysical Journal ·A. Punanova,A. I. Vasyunin,P. Caselli,(unknown),S. Spezzano,Yancy L. Shirley,(unknown),J. Harju	14
7	An Interferometric View of H-MM1. I. Direct Observation of NH₃ Depletion 2022 ·The Astronomical Journal ·J. E. Pineda,J. Harju,P. Caselli,O. Sipilä,M. Juvela,C. Vastel,Erik Rosolowsky,Andreas Burkert,Rachel Friesen,Yancy L. Shirley,María José Maureira,(unknown),Dominique Segura-Cox,R. Güsten,A. Punanova,L. Bizzocchi,Alyssa Goodman	25
8	Magnetic Field Structure of Dense Cores Using Spectroscopic Methods 2019 ·The Astrophysical Journal ·(unknown),Philip C. Myers,Shantanu Basu,J. Harju,J. E. Pineda,Rachel Friesen	6
9	Dust opacity variations in the pre-stellar core L1544 2019 ·Springer Link (Chiba Institute of Technology) ·A. Chacón-Tanarro,J. E. Pineda,P. Caselli,L. Bizzocchi,Robert Gutermuth,Brian Mason,Arturo I. Gómez-Ruiz,J. Harju,Mark J. Devlin,Simon Dicker,Tony Mroczkowski,C. Romero,Jonathan Sievers,(unknown),Stella S. R. Offner,David Sánchez-Argüelles	21
10	Search for grain growth toward the center of L1544 2017 ·Springer Link (Chiba Institute of Technology) ·A. Chacón-Tanarro,P. Caselli,L. Bizzocchi,J. E. Pineda,J. Harju,M. Spaans,F.–X. Désert	14
11	Deuteration of ammonia in the starless core Ophiuchus/H-MM1 2017 ·Astronomy and Astrophysics ·J. Harju,F. Daniel,O. Sipilä,P. Caselli,J. E. Pineda,Rachel Friesen,A. Punanova,R. Güsten,L. Wiesenfeld,P. C. Myers,A. Faure,P. Hily-Blant,Claire Rist,Erik Rosolowsky,Stephan Śchlemmer,(unknown)	34
12	Chemical differentiation in a prestellar core traces non-uniform illumination 2016 ·Springer Link (Chiba Institute of Technology) ·(unknown),L. Bizzocchi,P. Caselli,J. Harju,Sandra Brünken	19
13	The physical state of selected cold clumps 2015 ·Springer Link (Chiba Institute of Technology) ·(unknown),M. Juvela,V.-M. Pelkonen,J. Malinen,J. Harju	9
14	H2D+ observations give an age of at least one million years for a cloud core forming Sun-like stars 2014 ·Nature ·Sandra Brünken,O. Sipilä,E. T. Chambers,J. Harju,P. Caselli,Oskar Asvany,C. E. Honingh,T. Kamiński,K. M. Menten,J. Stützki,Stephan Śchlemmer	82
15	Mapping the prestellar core Ophiuchus D (L1696A) in ammonia 2011 ·Springer Link (Chiba Institute of Technology) ·(unknown),J. Harju,M. Juvela,O. Miettinen,(unknown),(unknown),T. Lunttila,(unknown)	5
16	CH abundance gradient in TMC-1 2011 ·Springer Link (Chiba Institute of Technology) ·(unknown),W. D. Geppert,J. Harju,(unknown),(unknown),M. Juvela,T. J. Millar,Catherine Walsh,J. G. A. Wouterloot	13
17	Physical properties of dense cores in Orion B9 2010 ·Springer Link (Chiba Institute of Technology) ·O. Miettinen,J. Harju,L. K. Haikala,M. Juvela	6
18	Detection of 6 K gas in Ophiuchus D 2008 ·Springer Link (Chiba Institute of Technology) ·J. Harju,M. Juvela,Stephan Śchlemmer,L. K. Haikala,K. Lehtinen,K. Mattila	15
19	The ratio ofN(C$\mathsf{^{18}}$O) andA$\mathsf{_{V}}$ in Chamaeleon I and III-B 2006 ·Astronomy and Astrophysics ·J. Kainulainen,K. Lehtinen,J. Harju	20
20	Centimeter wavelength continuum observations of young stellar objects\n in the dark cloud DC 303.8–14.2 2003 ·Springer Link (Chiba Institute of Technology) ·K. Lehtinen,J. Harju	4

About J. Harju

J. Harju is a scholar working on Astronomy and Astrophysics, Spectroscopy and Instrumentation, having authored 61 papers that have together received 938 indexed citations. Recurring topics across this work include Astrophysics and Star Formation Studies (55 papers), Stellar, planetary, and galactic studies (35 papers) and Molecular Spectroscopy and Structure (25 papers). The work is most often cited by research in Astronomy and Astrophysics (850 citations), Spectroscopy (526 citations) and Atmospheric Science (324 citations). J. Harju has collaborated with scholars based in Finland, Germany and France. Frequent co-authors include P. Caselli, O. Sipilä, M. Juvela, L. K. Haikala, K. Lehtinen, Stephan Śchlemmer, O. Miettinen, L. Bizzocchi, K. Mattila and И. И. Зинченко. Their work appears in journals such as Nature, The Astrophysical Journal and Astronomy and Astrophysics.

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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