J. Harju

University of Helsinki — Finland

Physics and Astronomy · Physical Sciences

26h-index1.9kcitations124works1.42yr avg
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Research Topics

Astrophysics and Star Formation Studies(91), Stellar, planetary, and galactic studies(54), Astro and Planetary Science(39), Molecular Spectroscopy and Structure(39), Atmospheric Ozone and Climate(36)

Publications123 total

Hunting pre-stellar cores with APEX: Overview
Astronomy and Astrophysics·2025Open Access
Statistical nuclear spin ratios of deuterated ammonia in the pre-stellar core L1544
Astronomy and Astrophysics·2025· 1 citedOpen Access
Statistical nuclear spin ratios of deuterated ammonia in the pre-stellar core L1544
arXiv (Cornell University)·2025Open Access
Hunting pre-stellar cores with APEX: Corona Australis 151, the densest pre-stellar core or the youngest protostar?
Astronomy and Astrophysics·2025· 3 citedOpen Access
Hunting pre-stellar cores with APEX: Corona Australis 151, the densest pre-stellar core or the youngest protostar?
arXiv (Cornell University)·2025Open Access
Hunting pre-stellar cores with APEX IRAS16293E (Oph464)
Astronomy and Astrophysics·2025· 7 citedOpen Access
Hunting pre-stellar cores with APEX: IRAS16293E (Oph464)
arXiv (Cornell University)·2024Open Access
A low cosmic-ray ionisation rate in the pre-stellar core Ophiuchus/H-MM1
Astronomy and Astrophysics·2024· 2 citedOpen Access
A low cosmic-ray ionisation rate in the prestellar core Ophiuchus/H-MM1. Mapping of the molecular ions ortho-H2D+, N2H+, and DCO+
arXiv (Cornell University)·2024Open Access
Toward a European Facility for Ground-Based Radar Observations of Near-Earth Objects
Remote Sensing·2023· 1 citedOpen Access
Towards a European Facility for Ground-Based Radar Observations of Near-Earth Objects
Preprints.org·2023· 3 citedOpen Access
Nuclear spin ratios of deuterated ammonia in prestellar cores
Astronomy and Astrophysics·2023· 6 citedOpen Access
Nuclear spin ratios of deuterated ammonia in prestellar cores. LAsMA observations of H-MM1 and Oph D
arXiv (Cornell University)·2023Open Access
Initial conditions of star formation at ≲2000 au: Physical structure and NH<sub>3</sub> depletion of three early-stage cores
Astronomy and Astrophysics·2023· 9 citedOpen Access
Initial conditions of star formation at $\lesssim$2000 au: physical structure and NH$_{3}$ depletion of three early-stage cores
arXiv (Cornell University)·2023Open Access
An Interferometric View of H-MM1. I. Direct Observation of NH<sub>3</sub> Depletion
The Astronomical Journal·2022· 33 citedOpen Access
The Central 1000 au of a Prestellar Core Revealed with ALMA. II. Almost Complete Freeze-out
The Astrophysical Journal·2022· 74 citedOpen Access
Methanol Mapping in Cold Cores: Testing Model Predictions*
The Astrophysical Journal·2022· 22 citedOpen Access
Chemical exploration of Galactic cold cores
Astronomy and Astrophysics·2022· 3 citedOpen Access
Methanol Mapping in Cold Cores: Testing Model Predictions
arXiv (Cornell University)·2021Open Access
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Frequent Co-authors

P. Caselli(16), M. Juvela(16), O. Sipilä(13), K. Mattila(11), L. Bizzocchi(8), K. Lehtinen(7), J. E. Pineda(7), L. K. Haikala(7), Stephan Śchlemmer(6), L. Pagani(6), V. Buat(6), Charles L. Curry(6), P. A. Feldman(6), H.-G. Florén(6), U. Frisk(6), E. M. Gregersen(6), T. Hasegawa(6), Sun Kwok(6), T. Liljeström(6), G. F. Mitchell(6)