Zobrazeno 1 - 10
of 371
pro vyhledávání: '"Koopmans, Léon"'
Autor:
Acharya, Anshuman, Ma, Qing-bo, Giri, Sambit K., Ciardi, Benedetta, Ghara, Raghunath, Mellema, Garrelt, Zaroubi, Saleem, Hothi, Ian, Iliev, Ilian T., Koopmans, Léon V. E., Bianco, Michele
A detection of the 21-cm signal power spectrum from the Epoch of Reionization is imminent, thanks to consistent advancements from telescopes such as LOFAR, MWA, and HERA, along with the development of SKA. In light of this progress, it is crucial to
Externí odkaz:
http://arxiv.org/abs/2410.11620
The 21-cm brightness-temperature field of neutral hydrogen during the Epoch of Reionization and Cosmic Dawn is a rich source of cosmological and astrophysical information, primarily due to its significant non-Gaussian features. However, the complex,
Externí odkaz:
http://arxiv.org/abs/2409.06769
Autor:
Acharya, Anshuman, Mertens, Florent, Ciardi, Benedetta, Ghara, Raghunath, Koopmans, Léon V. E., Zaroubi, Saleem
The use of Gaussian Process Regression (GPR) for foregrounds mitigation in data collected by the LOw-Frequency ARray (LOFAR) to measure the high-redshift 21-cm signal power spectrum has been shown to have issues of signal loss when the 21-cm signal c
Externí odkaz:
http://arxiv.org/abs/2408.10051
Autor:
Choudhury, Madhurima, Ghara, Raghunath, Zaroubi, Saleem, Ciardi, Benedetta, Koopmans, Leon V. E., Mellema, Garrelt, Shaw, Abinash Kumar, Acharya, Anshuman, Iliev, I. T., Ma, Qing-Bo, Giri, Sambit K.
The high redshift 21-cm signal promises to be a crucial probe of the state of the intergalactic medium (IGM). Understanding the connection between the observed 21-cm power spectrum and the physical quantities intricately associated with the IGM is cr
Externí odkaz:
http://arxiv.org/abs/2407.03523
Autor:
Uronen, Laura E., Li, Tian, Janquart, Justin, Phurailatpam, Hemantakumar, Poon, Jason S. C., Wempe, Ewoud, Koopmans, Léon V. E., Hannuksela, Otto A.
A rather clear problem has remained in black hole physics: localizing black holes. One of the recent theoretical ways proposed to identify black hole mergers' hosts is through multi-messenger gravitational lensing: matching the properties of a lensed
Externí odkaz:
http://arxiv.org/abs/2406.14257
Autor:
Ghara, Raghunath, Shaw, Abinash Kumar, Zaroubi, Saleem, Ciardi, Benedetta, Mellema, Garrelt, Koopmans, Léon V. E., Acharya, Anshuman, Choudhury, Madhurima, Giri, Sambit K., Iliev, Ilian T., Ma, Qing-Bo, Mertens, Florent
Publikováno v:
A&A 687, A252 (2024)
The redshifted 21-cm signal from the epoch of reionization (EoR) directly probes the ionization and thermal states of the intergalactic medium during that period. In particular, the distribution of the ionized regions around the radiating sources dur
Externí odkaz:
http://arxiv.org/abs/2404.11686
Autor:
Nagam, Bharath Chowdhary, Koopmans, Léon V. E., Valentijn, Edwin A., Kleijn, Gijs Verdoes, de Jong, Jelte T. A., Napolitano, Nicola, Li, Rui, Tortora, Crescenzo
Convolutional neural networks (CNNs) are the state-of-the-art technique for identifying strong gravitational lenses. Although they are highly successful in recovering genuine lens systems with a high true-positive rate, the unbalanced nature of the d
Externí odkaz:
http://arxiv.org/abs/2311.08184
Autor:
Busillo, Valerio, Tortora, Crescenzo, Napolitano, Nicola R., Koopmans, Leon V. E., Covone, Giovanni, Gentile, Fabrizio, Hunt, Leslie K.
We compare the structural properties and dark matter content of star-forming galaxies taken from the CAMELS cosmological simulations to the observed trends derived from the SPARC sample in the stellar mass range $[10^{9}, 10^{11}]\,\textrm{M}_{\odot}
Externí odkaz:
http://arxiv.org/abs/2308.14822
Inspired by the discussion in the community on possible hidden systematic errors in late universe cosmological probes and non-trivial physical models developed to reduce the Hubble tension, we investigate the Pantheon and Pantheon+ SNe samples for po
Externí odkaz:
http://arxiv.org/abs/2308.05157
Autor:
Ma, Qing-Bo, Ghara, Raghunath, Ciardi, Benedetta, Iliev, Ilian T., Koopmans, Léon V. E., Mellema, Garrelt, Mondal, Rajesh, Zaroubi, Saleem
To self-consistently model galactic properties, reionization of the intergalactic medium, and the associated 21-cm signal, we have developed the algorithm polar by integrating the one-dimensional radiative transfer code grizzly with the semi-analytic
Externí odkaz:
http://arxiv.org/abs/2304.09508