Hello Earth!

I am Dr. Martijn Oei, an astrophysicist at the California Institute of Technology.

BNR Newsradio interview on the discovery of Alcyoneus, Amsterdam

Introduction

Thank you for visiting my website! I am the Prize Postdoctoral Scholar in Observational Astronomy at the California Institute of Technology (Caltech).

My research covers radio astronomy, cosmology, and astrostatistics. I study giant jet systems generated by black holes in the centres of galaxies, and their impact on the Cosmic Web: the Universe’s large-scale network of matter. Additionally, I search for low–surface brightness radio emission from the Cosmic Web itself.

Recently, my team and I discovered the black hole jet system Porphyrion, the largest known structure made by an astrophysical body. Read more.

More about me

I primarily observe with radio interferometers, such as the International LOFAR Telescope, the Upgraded Giant Metrewave Radio Telescope, and the Jansky Very Large Array.

I am a member of the LOFAR Collaboration and the DSA-2000 Collaboration.

Prior to my current position, I obtained my PhD (cum laude) at Leiden Observatory, Leiden University. Before, I read for a MASt in Applied Mathematics from the University of Cambridge and a MSc in Cosmology from Leiden University.

For a detailed CV, check out my CV page.

For any further inquiries, please feel free to contact me at oei@caltech.edu.

Discussion at the LOFAR Family Meeting 2024, Leiden

First-author publications (including shared)

9. Black hole jets on the scale of the Cosmic Web

Martijn S.S.L. Oei, Martin J. Hardcastle, Roland Timmerman, Aivin R.D.J.G.I.B. Gast, Andrea Botteon, Antonio C. Rodriguez, Daniel K. Stern, Gabriela Calistro Rivera, Reinout J. van Weeren, Huub J.A. Röttgering, Huib T. Intema, Francesco de Gasperin, Stanislav G. Djorgovski
Nature, 2024 — Preprint

8. Constraining the giant radio galaxy population with machine learning and Bayesian inference

Rafaël I.J. Mostert, Martijn S.S.L. Oei, Bonny Barkus, Lara Alegre, Martin J. Hardcastle, Kenneth J. Duncan, Huub J.A. Röttgering, Reinout J. van Weeren, Maya Horton
Astronomy & Astrophysics, 2024 — Read

7. Luminous giants populate the dense Cosmic Web: The radio luminosity–environmental density relation for radio galaxies in action

Martijn S.S.L. Oei, Reinout J. van Weeren, Martin J. Hardcastle, Aivin R.D.J.G.I.B. Gast, Florent Leclercq, Huub J.A. Röttgering, Pratik Dabhade, Tim W. Shimwell, Andrea Botteon
Astronomy & Astrophysics, 2024 — Read

6. Measuring the giant radio galaxy length distribution with the LoTSS

Martijn S.S.L. Oei, Reinout J. van Weeren, Aivin R.D.J.G.I.B. Gast, Andrea Botteon, Martin J. Hardcastle, Pratik Dabhade, Tim W. Shimwell, Huub J.A. Röttgering, Alexander Drabent
Astronomy & Astrophysics, 2023 — Read

5. An intergalactic medium temperature from a giant radio galaxy

Martijn S.S.L. Oei, Reinout J. van Weeren, Martin J. Hardcastle, Franco Vazza, Tim W. Shimwell, Florent Leclercq, Marcus Brüggen, Huub Röttgering
Monthly Notices of the Royal Astronomical Society, 2023 — Read

4. Filamentary Baryons and Where to Find Them: A forecast of synchrotron radiation from merger and accretion shocks in the local Cosmic Web

Martijn S.S.L. Oei, Reinout J. van Weeren, Franco Vazza, Florent Leclercq, Akshatha Gopinath, Huub J.A. Röttgering
Astronomy & Astrophysics, 2022 — Read

3. The discovery of a radio galaxy of at least 5 Mpc

Martijn S.S.L. Oei, Reinout J. van Weeren, Martin J. Hardcastle, Andrea Botteon, Tim W. Shimwell, Pratik Dabhade, Aivin R.D.J.G.I.B. Gast, Huub J.A. Röttgering, Marcus Brüggen, Cyril Tasse, Wendy L. Williams, Aleksandar Shulevski
Astronomy & Astrophysics, 2022 — Read

2. Data-driven phenotyping of central disorders of hypersomnolence with unsupervised clustering

Jari K. Gool, Zhongxing Zhang, Martijn S.S.L. Oei, Stephanie Mathias, Yves Dauvilliers, Geert Mayer, Giuseppe Plazzi, Rafael del Rio-Villegas, Joan Santamaria Cano, Karel Šonka, Markku Partinen, Sebastiaan Overeem, Rosa Peraita-Adrados, Raphael Heinzer, Antonio Martins da Silva, Birgit Högl, Aleksandra Wierzbicka, Anna Heidbreder, Eva Feketeova, Mauro Manconi, Jitka Bušková, Francesca Canellas, Claudio L. Bassetti, Lucie Barateau, Fabio Pizza, Markus H. Schmidt, Rolf Fronczek, Ramin Khatami, Gert Jan Lammers
Neurology, 2022 — Read

1. A probabilistic approach to direction-dependent ionospheric calibration

Joshua G. Albert, Martijn S.S.L. Oei, Reinout J. van Weeren, Huib T. Intema, Huub J.A. Röttgering
Astronomy & Astrophysics, 2020 — Read

Contact

Please do not hesitate to reach out!

Office: Cahill Center for Astronomy and Astrophysics, California Institute of Technology, 1216 East California Boulevard, Pasadena, CA 91125, United States of America

University page: pma.caltech.edu/people/martijn-oei

ORCID: 0000-0002-0610-2644