Dr Roland Timmerman's Outputs (4)

LOFAR Non-detections of SN 2023ixf in its First Year Post-explosion (2024)
Journal Article
Timmerman, R., Arias, M., & Botteon, A. (2024). LOFAR Non-detections of SN 2023ixf in its First Year Post-explosion. Research Notes of the American Astronomical Society, 8(12), Article 311. https://doi.org/10.3847/2515-5172/ad9eae

We used the LOw Frequency ARray (LOFAR) telescope to monitor SN 2023ixf, a core-collapse supernova in M101, between 8 and 368 days post-explosion. We report non-detections down to ~ 80 μJy sensitivity at 144 MHz. Our non-detections are consistent wit... Read More about LOFAR Non-detections of SN 2023ixf in its First Year Post-explosion.

LOFAR high-band antenna observations of the Perseus cluster: The discovery of a giant radio halo (2024)
Journal Article
van Weeren, R. J., Timmerman, R., Vaidya, V., Gendron-Marsolais, M.-L., Botteon, A., Roberts, I. D., Hlavacek-Larrondo, J., Bonafede, A., Brüggen, M., Brunetti, G., Cassano, R., Cuciti, V., Edge, A. C., Gastaldello, F., Groeneveld, C., & Shimwell, T. W. (2024). LOFAR high-band antenna observations of the Perseus cluster: The discovery of a giant radio halo. Astronomy & Astrophysics, 692, Article A12. https://doi.org/10.1051/0004-6361/202451618

The Perseus cluster is the brightest X-ray cluster in the sky and is known as a cool-core galaxy cluster. Being a very nearby cluster, it has been extensively studied. This has provided a comprehensive view of the physical processes that operate in t... Read More about LOFAR high-band antenna observations of the Perseus cluster: The discovery of a giant radio halo.

Black hole jets on the scale of the cosmic web. (2024)
Journal Article
Oei, M. S. S. L., Hardcastle, M. J., Timmerman, R., Gast, A. R. D. J. G. I. B., Botteon, A., Rodriguez, A. C., Stern, D., Calistro Rivera, G., van Weeren, R. J., Röttgering, H. J. A., Intema, H. T., de Gasperin, F., & Djorgovski, S. G. (2024). Black hole jets on the scale of the cosmic web. Nature, 633(8030), 537-541. https://doi.org/10.1038/s41586-024-07879-y

When sustained for megayears (refs.  ), high-power jets from supermassive black holes (SMBHs) become the largest galaxy-made structures in the Universe . By pumping electrons, atomic nuclei and magnetic fields into the intergalactic medium (IGM), the... Read More about Black hole jets on the scale of the cosmic web..

The first high-redshift cavity power measurements of cool-core galaxy clusters with the International LOFAR Telescope (2024)
Journal Article
Timmerman, R., van Weeren, R. J., Botteon, A., Röttgering, H. J. A., Morabito, L. K., & Sweijen, F. (2024). The first high-redshift cavity power measurements of cool-core galaxy clusters with the International LOFAR Telescope. Astronomy & Astrophysics, 687, Article A31. https://doi.org/10.1051/0004-6361/202347974

Radio-mode feedback associated with the active galactic nuclei (AGNs) at the cores of galaxy clusters injects a large amount of energy into the intracluster medium (ICM), offsetting radiative losses through X-ray emission. This mechanism prevents the... Read More about The first high-redshift cavity power measurements of cool-core galaxy clusters with the International LOFAR Telescope.