Gabor Orosz

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I'm a radio astronomer with over a decade of experience working with VLBI networks across Europe, Japan, Australia, and China. My personal research focuses on maser astrometry, with a main interest in Water Fountain stars: rare evolved objects with high-velocity outflows.

I enjoy bridging the gap between telescope operations and science, having spent the last four years supporting the European VLBI Network while continuing collaborative research.

Currently seeking new opportunities in radio astronomy research and operations.

Education

PhD in Radio Astronomy
Kagoshima University, Japan • 2013–2017

MSc in Surveying and Geoinformatics
Budapest University of Technology and Economics, Hungary • 2010–2012

BSc in Civil Engineering
Budapest University of Technology and Economics, Hungary • 2006–2010

Experience

Support Scientist
Joint Institute for VLBI ERIC, Netherlands • 2021–2025

EVN operations, correlation, testing, pipeline processing, user support and training.

Postdoctoral Researcher
University of Tasmania, Australia • 2018–2021

VLBI survey commissioning and management, LBA operations, student co-supervision.

Assistant Researcher
Xinjiang Astronomical Observatory, China • 2017–2018

Maser VLBI research, Nanshan 26m operations, EAVN collaboration, institute outreach.

PhD Researcher
Kagoshima University, Japan • 2013–2017

VLBI astrometry research, VERA and KaVA observations, single-dish support.

Skills

Publications

30 refereed articles • 23 proceedings • H-index: 15 • Total IF: 175 • 550+ citations
View full publication list →

Grants

Monbukagakusho:MEXT Research Fellowship (Japan, 2013–2017)
Chinese Academy of Sciences, Light of West China Program (China, 2018–2022)

Last updated: November 2025

Beyond the Stars by Julie Dillon

Research

Birth and Death of a Star by Jian Guo

I use VLBI to measure precise distances to stars and study rare astronomical phenomena, from dying stars launching jets to massive protostars still forming.

Research Areas

Water Fountain Stars

Rare evolved stars with high-velocity jets: laboratories for studying how binaries could shape stellar death. I mapped new sources, measured 3D outflow velocities, and tracked their evolution with maser VLBI and ALMA.

Orosz+ 2019 • Tafoya+ 2019 • Tafoya+ 2020 • Imai+ 2020 • Baan+ 2021 • Amada+ 2022 • Uscanga+ 2023 • Imai+ 2023 • Imai+ 2025

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High-Mass Stars & Masers

Maser observations of massive protostars reveal disk structure and flaring events. I've contributed to VLBI campaigns discovering spiral arms in protostellar disks and record-breaking maser bursts.

Burns+ 2020 • Burns+ 2020 • Stecklum+ 2021 • McCarthy+ 2022 • Hirota+ 2022 • Kobak+ 2023 • Burns+ 2023 • Rosli+ 2024

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VLBI Astrometry

Measuring distances to dust-enshrouded stars invisible to optical surveys like Gaia. I contributed to developing the MultiView technique for VLBI astrometry and worked on parallaxes with multiple maser species.

Orosz+ 2017 • Rioja+ 2017 • Xu+ 2022 • Hyland+ 2022 • Nakagawa+ 2023 • Hyland+ 2023 • Kumar+ 2025

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AGN & Other Collaborations

I provide VLBI expertise to collaborative projects on active galactic nuclei, and other topics including high-redshift quasars, optical-radio positional offsets, interstellar scintillation, and geodesy.

Orosz+ 2013 • Braunmüller+ 2013 • Hiura+ 2018 • Said+ 2021 • Gabányi+ 2023 • Chen+ 2024

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Papers

Scholar's Tower by Julie Dillon

ORCID Astrophysics Data System Google Scholar

First-Author Refereed Publications

1. Orosz G., Frey S., 2013, A&A, 553, A13
   "Optical-radio positional offsets for active galactic nuclei"
2. Orosz G., Imai H., Dodson R., Rioja M. J., Frey S., Godfrey L. E. H., Hirota T., Sanna A., 2017, AJ, 153, 119
   "Astrometry of OH/IR Stars Using 1612 MHz Hydroxyl Masers. I. Annual Parallaxes of WX Psc and OH 138.0+7.2"
3. Orosz G., Gómez J. F., Imai H., Tafoya D., Gunawan D. Y. A., Burns R. A., Yung B. H. K., Uscanga L., Sahai R., 2019, MNRAS, 482, L40
   "Rapidly evolving episodic outflow in IRAS 18113-2503: clues to the ejection mechanism of the fastest water fountain"

Co-Author Refereed Publications

4. Braunmüller P., Orosz G., 2013, Geocarto Int, 28, 37
   "The basis of synthetic aperture radar interferometry in Hungary"
5. Rioja M. J., Dodson R., Orosz G., Imai H., Frey S., 2017, AJ, 153, 105
   "MultiView High Precision VLBI Astrometry at Low Frequencies"
6. Hiura K., Nagai H., Kino M., Niinuma K., Sorai K., Chida H., Akiyama K., D'Ammando F., Giovannini G., Giroletti M., Hada K., Honma M., Koyama S., Orienti M., Orosz G., Sawada-Satoh S., 2018, PASJ, 70, 83
   "VERA monitoring of the radio jet 3C 84 in the period of 2007-2013: Detection of non-linear motion"
7. Tafoya D., Orosz G., Vlemmings W. H. T., Sahai R., Pérez-Sánchez A. F., 2019, A&A, 629, A8
   "Spatio-kinematical model of the collimated molecular outflow in the water-fountain nebula IRAS 16342-3814"
8. Burns R. A., Orosz G., Bayandina O., Surcis G., Olech M., MacLeod G., Volvach A., Rudnitskii G., Hirota T., Immer K., Blanchard J., Marcote B., van Langevelde H. J., Chibueze J. O., Sugiyama K., Kim K.-T., Val'tts I., Shakhvorostova N., Kramer B., Baan W. A., Brogan C., Hunter T., Kurtz S., Sobolev A. M., Brand J., Volvach L., 2020, MNRAS, 491, 4069
   "VLBI observations of the G25.65+1.05 water maser superburst"
9. Burns R. A., Sugiyama K., Hirota T., Kim K.-T., Sobolev A. M., Stecklum B., MacLeod G. C., Yonekura Y., Olech M., Orosz G., Ellingsen S. P., Hyland L., Caratti o Garatti A., Brogan C., Hunter T. R., Phillips C., van den Heever S. P., Eisloeffel J., Linz H., Surcis G., Chibueze J. O., Baan W., Kramer B., 2020, NatAs, 4, 506
   "A heatwave of accretion energy traced by masers in the G358-MM1 high-mass protostar"
10. Tafoya D., Imai H., Gómez J. F., Nakashima J., Orosz G., Yung B. H. K., 2020, ApJL, 890, L14
    "Shaping the Envelope of the Asymptotic Giant Branch Star W43A with a Collimated Fast Jet"
11. Imai H., Uno Y., Maeyama D., Yamaguchi R., Amada K., Hamae Y., Orosz G., Gómez J. F., Tafoya D., Uscanga L., Burns R. A., 2020, PASJ, 72, 58
    "FLASHING: New high-velocity H2O masers in IRAS 18286-0959"
12. Stecklum B., Wolf V., Linz H., Caratti o Garatti A., Schmidl S., Klose S., Eisloeffel J., Fischer Ch., Brogan C., Burns R. A., Bayandina O., Cyganowski C., Gurwell M., Hunter T., Hirano N., Kim K.-T., MacLeod G., Menten K. M., Olech M., Orosz G., Sobolev A., Sridharan T. K., Surcis G., Sugiyama K., van der Walt J., Volvach A., Yonekura Y., 2021, A&A, 646, A161
    "Infrared observations of the flaring maser source G358.93-0.03. SOFIA confirms an accretion burst from a massive young stellar object"
13. Said N. M. M., Ellingsen S. P., Shabala S., Orosz G., Liu J., Bignall H. E., McCallum J. N., Reynolds C., 2021, MNRAS, 508, 2881
    "Investigating the evolution of PKS B1144-379: comparison of VLBI and scintillation techniques"
14. Baan W. A., Imai H., Orosz G., 2021, RAA, 21, 275
    "Fallback in bipolar planetary nebulae?"
15. McCarthy T. P., Orosz G., Ellingsen S. P., Breen S. L., Voronkov M. A., Burns R. A., Olech M., Yonekura Y., Hirota T., Hyland L. J., Wolak P., 2022, MNRAS, 509, 1681
    "Molecular line search towards the flaring 6.7-GHz methanol masers of G 24.33+0.13 and G 359.62-0.24: rare maser transitions detected"
16. Amada K., Imai H., Hamae Y., Nakashima K., Shum K. Y., Tafoya D., Uscanga L., Gómez J. F., Orosz G., Burns R. A., 2022, AJ, 163, 85
    "Discovery of SiO Masers in the "Water Fountain" Source IRAS 16552-3050"
17. Hyland L. J., Reid M. J., Ellingsen S. P., Rioja M. J., Dodson R., Orosz G., Masson C. R., McCallum J. M., 2022, ApJ, 932, 52
    "Inverse Multiview. I. Multicalibrator Inverse Phase Referencing for Microarcsecond Very Long Baseline Interferometry Astrometry"
18. Hirota T., Wolak P., Hunter T. R., Brogan C. L., Bartkiewicz A., Durjasz M., Kobak A., Olech M., Szymczak M., Burns R. A., Aberfelds A., Baek G., Brand J., Breen S., Byun D.-Y., Caratti o Garatti A., Chen X., Chibueze J. O., Cyganowski C., Eisloeffel J., Ellingsen S., Hirano N., Hu B., Kang J.-h., Kim J.-S., Kim J., Kim K.-T., Kim M. K., Kramer B., Lee J.-E., Linz H., Liu T., MacLeod G., McCarthy T. P., Menten K., Motogi K., Oh C.-S., Orosz G., Sobolev A. M., Stecklum B., Sugiyama K., Sunada K., Uscanga L., van den Heever F., Volvach A. E., Volvach L. N., Wu Y. W., Yonekura Y., 2022, PASJ, 74, 1234
    "Millimeter methanol emission in the high-mass young stellar object G24.33+0.14"
19. Xu S., Imai H., Yun Y., Zhang B., Rioja M. J., Dodson R., Cho S.-H., Kim J., Cui L., Sobolev A. M., Chibueze J. O., Kim D.-J., Amada K., Nakashima J.-i., Orosz G., Oyadomari M., Oh S., Yonekura Y., Sun Y., Mai X., Zhang J., Wen S., Jung T., 2022, ApJ, 941, 105
    "The Astrometric Animation of Water Masers toward the Mira Variable BX Cam"
20. Gabányi K. É., Belladitta S., Frey S., Orosz G., Gurvits L. I., Rozgonyi K., An T., Cao H., Paragi Z., Perger K., 2023, PASA, 40, e004
    "Very long baseline interferometry observations of the high-redshift blazar candidate J0141-5427"
21. Kobak A., Bartkiewicz A., Szymczak M., Olech M., Durjasz M., Wolak P., Chibueze J. O., Hirota T., Eisloeffel J., Stecklum B., Sobolev A., Bayandina O., Orosz G., Burns R. A., Kim K.-T., van den Heever S. P., 2023, A&A, 671, A135
    "Multi-frequency VLBI observations of maser lines during the 6.7 GHz maser flare in the high-mass young stellar object G24.33+0.14"
22. Uscanga L., Imai H., Gómez J. F., Tafoya D., Orosz G., McCarthy T. P., Hamae Y., Amada K., 2023, ApJ, 948, 17
    "Evolution of the Outflow in the Water Fountain Source IRAS 18043-2116"
23. Burns R. A., Uno Y., Sakai N., Blanchard J., Rosli Z., Orosz G., Yonekura Y., Tanabe Y., Sugiyama K., Hirota T., Kim K.-T., Aberfelds A., Volvach A. E., Bartkiewicz A., Caratti o Garatti A., Sobolev A. M., Stecklum B., Brogan C., Phillips C., Ladeyschikov D. A., Johnstone D., Surcis G., MacLeod G. C., Linz H., Chibueze J. O., Brand J., Eisloeffel J., Hyland L., Uscanga L., Olech M., Durjasz M., Bayandina O., Breen S., Ellingsen S. P., van den Heever S. P., Hunter T. R., Chen X., 2023, NatAs, 7, 557
    "A Keplerian disk with a four-arm spiral birthing an episodically accreting high-mass protostar"
24. Nakagawa A., Morita A., Sakai N., Kurayama T., Sudou H., Orosz G., Yuda A., Kaseda D., Matsuno M., Hamada S., Omodaka T., Ueno Y., Shibata K. M., Tamura Y., Jike T., Hirano K., Honma M., 2023, PASJ, 75, 529
    "Astrometric VLBI observations of H2O masers in an extreme OH/IR star candidate NSV 17351"
25. Hyland L. J., Reid M. J., Orosz G., Ellingsen S. P., Weston S. D., Kumar J., Dodson R., Rioja M. J., Hankey W. J., Yates-Jones P. M., Natusch T., Gulyaev S., Menten K. M., Brunthaler A., 2023, ApJ, 953, 21
    "Inverse MultiView. II. Microarcsecond Trigonometric Parallaxes for Southern Hemisphere 6.7 GHz Methanol Masers G232.62+00.99 and G323.74-00.26"
26. Imai H., Hamae Y., Amada K., Nakashima K., Shum K.-Y., Kasai R., Gómez J. F., Uscanga L., Tafoya D., Orosz G., Burns R. A., 2023, PASJ, 75, 1183
    "FLASHING: Project overview"
27. Rosli Z., Burns R. A., Nazri A. A., Sugiyama K., Hirota T., Kim K.-T., Yonekura Y., Tie L., Orosz G., Chibueze J. O., Sobolev A. M., Kang J. H., Lee C. W., Hwang J., Mohammad H., Hashim N., Abidin Z. Z., 2024, MNRAS, 527, 10031
    "Limits of water maser kinematics: insights from the high-mass protostar AFGL 5142-MM1"
28. Chen S., Laor A., Behar E., Baldi R. D., Gelfand J. D., Kimball A. E., McHardy I. M., Orosz G., Paragi Z., 2024, ApJ, 975, 35
    "Windy or Not: Radio Parsec-scale Evidence for a Broad-line Region Wind in Radio-quiet Quasars"
29. Kumar J., Ellingsen S. P., Orosz G., Hyland L. J., Phillips C., Reynolds C., MacLeod G., 2025, MNRAS, arXiv:2502.07522
    "The Extraordinary Maser Flaring Event in the Massive Protostellar System NGC6334I: Multi-epoch milliarcsecond resolution investigation of the 6.7-GHz Methanol Masers"
30. Imai H., Hoshino T., Tafoya D., Gómez J. F., Nakashima J.-ichi., Orosz G., 2025, ApJ, 987, 114
    "SiO v = 1 J = 5 → 4 Maser Emission from the Root of the "Water Fountain" Source W 43A"

Non-Refereed Publications

1. Orosz G., Frey S., 2012, MmSAI, 83, 990.
2. Imai H., Burns R. A., Yamada Y., Goda N., Yano T., Orosz G., Niinuma K., Bekki K., 2016, SKA Japan Science Book.
3. Oyadomari M., Imai H., Cho S.-H., Asaki Y., Choi Y.-K., Kim J., Yun Y., Matsumoto N., Min C.-H., Oyama T., Yoon S.-C., Yoon D.-H., Kim D.-J., Dodson R., Rioja M., Burns R., Orosz G., Nakagawa A., Chibueze O. J., Nakashima J.-i., Sobolev A., 2016, JPhCS, 728, 072006.
4. Orosz G., Rioja M. J., Dodson R., Imai H., Frey S., 2018, 13th European VLBI Network Symposium and Users Meeting, Transactions of IAA RAS, 40, 34.
5. Orosz G., Gómez J. F., Tafoya D., Imai H., Torrelles J. M., Ngendo A. N., Burns R. A., 2018, IAUS, 336, 351.
6. Nakagawa A., Kurayama T., Orosz G., Burns R. A., Oyama T., Nagayama T., Miyata T., Sekido M., Baba J., Wada K., 2018, IAUS, 336, 365.
7. Rioja M., Dodson R., Orosz G., Imai H., 2018, IAUS, 336, 439.
8. Burns R. A., Bayandina O., Orosz G., Olech M., Immer K., Blanchard J., Marcote B., Van Langevelde H., Hirota T., Kim K. T., Val'tts I., Shakhvorostova N., Rudnitskii G., Volvach A., Volvach L., MacLeod G., Chibueze J. O., Surcis G., Kramer B., Baan W., Brogan C. L., Hunter T., Kurtz S., 2018, 14th European VLBI Network Symposium, 75.
9. Nakagawa A., Kurayama T., Orosz G., Oyama T., Nagayama T., Omodaka T., 2019, IAUS, 343, 476.
10. Burns R. A., Kobak A., Garatti A. C. o., Tolmachev A., Volvach A., Alakoz A., Wootten A., Bisyarina A., Dzodzomenyo A., Sobolev A., Bartkiewicz A., Aberfelds A., Stecklum B., Kramer B., Macdonald C., Cyganowski C., Paco C., Garcia Miro C., Brogan C. L., Li D., Smits D., Engels D., Ladeyschikov D., Johnstone D., Popova E., Proven-Adzri E., van den Heever F., Orosz G., Surcis G., Wu G., MacLeod G., Linz H., Imai H., Van Langevelde H., Valtts I., Shmeld I., Chibueze J. O., Brand J., Kumar J., Green J., Vorster J., Eisloeffel J., Kim J., Sugiyama K., Menten K. M., Immer K., Sunada K., Kim K. T., Volvach L., Moscadelli L., Jordan L., Uscanga L., Gray M. D., Szymczak M., Olech M., Hoare M., Durjasz M., Uchiyama M., Shakhvorostova N., Bayandina O., Wolak P., Gulyaev S., Khaibrakhmanov S., Breen S., Goedhart S., Casu S., Ellingsen S. P., Kurtz S., Weston S., Yoshihiro T., Natusch T., Hunter T., Hirota T., Baan W., Vlemmings W. H. T., Chen X., Gong Y., Yonekura Y., Szabó Z. M., Abraham Z., 2022, European VLBI Network Mini-Symposium and Users' Meeting, 19.
11. Molera Calvés G., Horiuchi S., Ellingsen S., Yates-Jones P., Orosz G., 2022, 44th COSPAR Scientific Assembly, 3146.
12. Imai H., Amada K., Gómez J. F., Uscanga L., Tafoya D., Nakashima K., Shum K.-Y., Hamae Y., Burns R., Orosz G., 2023, IAUS, 370, 91.
13. Gómez J. F., Imai H., Uscanga L., Suárez O., Cala R., Miranda L. F., Tafoya D., Orosz G., 2023, Proceedings of the XV Scientific Meeting of the Spanish Astronomical Society, 210.
14. Gabanyi K., Belladitta S., Frey S., Orosz G., Gurvits L., Rozgonyi K., An T., Cao H., Paragi Z., Perger K., 2023, EAS2023, S12, 1003.
15. Nakagawa A., Kurayama T., Sudou H., Orosz G., 2024, IAUS, 376, 159.
16. Hyland L. J., Ellingsen S. P., Reid M. J., Kumar J., Orosz G., 2024, IAUS, 380, 106.
17. Nakagawa A., Kurayama T., Sudou H., Orosz G., 2024, IAUS, 380, 300.
18. Xu S., Imai H., Yun Y., Zhang B., Rioja M. J., Dodson R., Cho S.-H., Kim J., Cui L., Sobolev A. M., Chibueze J. O., Kim D.-J., Amada K., Nakashima J.-i., Orosz G., Oyadomari M., Oh S., Yonekura Y., Sun Y., Mai X., Zhang J., Wen S., Jung T., 2024, IAUS, 380, 328.
19. Imai H., Amada K., Gómez J. F., Uscanga L., Tafoya D., Nakashima K., Shum K.-Y., Hamae Y., Burns R. A., Shibata Y., Kasai R., Takashima M., Orosz G., 2024, IAUS, 380, 333.
20. Uscanga L., Imai H., Gómez J. F., Tafoya D., Orosz G., McCarthy T. P., Hamae Y., Amada K., 2024, IAUS, 380, 338.
21. Amada K., Imai H., Hamae Y., Nakashima K., Shum K.-Y., Tafoya D., Uscanga L., Gómez J. F., Orosz G., Burns R. A., 2024, IAUS, 380, 359.
22. Lee D., Lee S. Y., Paragi Z., Orosz G., Oh J., Kim J.-Y., 2024, RNAAS, 8, 121.
23. Nakagawa A., Watanabe R., Kurayama T., Sudou H., Orosz G., Kamizuka T., Tachibana K., 2024, Proceedings of the 16th EVN Symposium, 137.

Contact

3D Sketch by Steve Chinhsuan Wang

References available upon request.