prof. dr. L.V.E. (Léon) Koopmans

Professor at the Kapteyn Astronomical Institute

Faculty of Science and Engineering

Telephone:

+31 50 36 36519

+31 50 36 34073 (Secretariat)

E-mail:

l.v.e.koopmans rug.nl

Homepage ORCID Research Portal

Publications

Automation of finding strong gravitational lenses in the Kilo Degree Survey with U-DenseLens (DenseLens + Segmentation)

Nagam, B. C., Koopmans, L. V. E., Valentijn, E. A., Kleijn, G. V., de Jong, J. T. A., Napolitano, N., Li, R., Tortora, C., Busillo, V. & Dong, Y., 24-Jan-2025, (Submitted) 16 p. (ArXiv).

Research output: Working paper › Preprint › Academic

Beyond the horizon: Quantifying the full sky foreground wedge in the cylindrical power spectrum

Munshi, S., Mertens, F. G., Koopmans, L. V. E., Offringa, A. R., Ceccotti, E., Brackenhoff, S. A., Chege, J. K., Gehlot, B. K., Ghosh, S., Höfer, C. & Mevius, M., Dec-2025, In: Astronomy & Astrophysics. 693, 20 p., A276.

Research output: Contribution to journal › Article › Academic › peer-review

CASCO: Cosmological and AStrophysical parameters from Cosmological simulations and Observations: II. Constraining cosmology and astrophysical processes with early- and late-type galaxies

Busillo, V., Tortora, C., Covone, G., Koopmans, L. V. E., Silvestrini, M. & Napolitano, N. R., Jan-2025, In: Astronomy & Astrophysics. 693, 20 p., A112.

Research output: Contribution to journal › Article › Academic › peer-review

Deeper multi-redshift upper limits on the epoch of reionisation 21 cm signal power spectrum from LOFAR between z = 8.3 and z = 10.1

Mertens, F. G., Mevius, M., Koopmans, L. V. E., Offringa, A. R., Zaroubi, S., Acharya, A., Brackenhoff, S. A., Ceccotti, E., Chapman, E., Chege, K., Ciardi, B., Ghara, R., Ghosh, S., Giri, S. K., Hothi, I., Hofer, C., Iliev, I. T., Jeliac, V., Ma, Q. & Mellema, G.& 3 others, Munshi, S., Pandey, V. N. & Yatawatta, S., 13-Jun-2025, In: Astronomy & Astrophysics. 698, 32 p., A186.

Research output: Contribution to journal › Article › Academic › peer-review

Euclid: Finding strong gravitational lenses in the Early Release Observations using convolutional neural networks

Euclid Collaboration, Nagam, B. C., Barroso, J. A. A., Wilde, J., Andika, I. T., Manjón-García, A., Pearce-Casey, R., Stern, D., Kleijn, G. V., Koopmans, L. V. E., Valentijn, E. A., Vernardos, G., Corcho-Caballero, P., Branchini, E., George, K., Kuijken, K., Laureijs, R. & Tsyganov, A., 13-Feb-2025, (Submitted) arXiv, 14 p.

Research output: Working paper › Preprint › Academic

Finding black holes: an unconventional multi-messenger

Uronen, L. E., Li, T., Janquart, J., Phurailatpam, H., Poon, J., Wempe, E., Koopmans, L. & Hannuksela, O., 10-Apr-2025, In: Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences. 383, 2294, 20240152.

Research output: Contribution to journal › Review article › peer-review

Galaxy-Galaxy Strong Lensing with U-Net (GGSL-UNet). I. Extracting Two-dimensional Information from Multiband Images in Ground and Space Observations

Zhong, F., Luo, R., Napolitano, N. R., Tortora, C., Li, R., Zhu, X., Busillo, V., Koopmans, L. V. E. & Longo, G., Mar-2025, In: Astrophysical Journal, Supplement Series. 277, 1, 24 p., 12.

Research output: Contribution to journal › Article › Academic › peer-review

Euclid: Searches for strong gravitational lenses using convolutional neural nets in Early Release Observations of the Perseus field

EUCLIDS Consortium, Pearce-Casey, R., N, B. C., Wilde, J., Busillo, V., Ulivi, L., Andika, I. T., Manjón-García, A., Koopmans, L. V. E., Laureijs, R., Valentijn, E. & Verdoes Kleijn, G., Apr-2025, In: Astronomy & Astrophysics. 696, 22 p., A214.

Research output: Contribution to journal › Article › Academic › peer-review

Inferring IGM parameters from the redshifted 21-cm power spectrum using Artificial Neural Networks

Choudhury, M., Ghara, R., Zaroubi, S., Ciardi, B., Koopmans, L. V. E., Mellema, G., Shaw, A. K., Acharya, A., Iliev, T., Ma, Q. B. & Giri, S. K., 1-Jun-2025, In: Journal of Cosmology and Astroparticle Physics. 2025, 6, 33 p., 003.

Research output: Contribution to journal › Article › Academic › peer-review

Near-field imaging of local interference in radio interferometric data: Impact on the redshifted 21 cm power spectrum

Munshi, S., Mertens, F. G., Koopmans, L. V. E., Mevius, M., Offringa, A. R., Semelin, B., Viou, C., Bracco, A., Brackenhoff, S. A., Ceccotti, E., Chege, J. K., Fialkov, A., Gao, L. Y., Ghara, R., Ghosh, S., Shaw, A. K., Zarka, P., Zaroubi, S., Cecconi, B. & Corbel, S.& 7 others, Girard, J. N., Grieãmeier, J. M., Konovalenko, O., Loh, A., Tokarsky, P., Ulyanov, O. & Zakharenko, V., 1-May-2025, In: Astronomy & Astrophysics. 697, 19 p., A203.

Research output: Contribution to journal › Article › Academic › peer-review