Search Results for author: Klaus Dolag

Found 13 papers, 3 papers with code

Field-level simulation-based inference with galaxy catalogs: the impact of systematic effects

no code implementations23 Oct 2023 Natalí S. M. de Santi, Francisco Villaescusa-Navarro, L. Raul Abramo, Helen Shao, Lucia A. Perez, Tiago Castro, Yueying Ni, Christopher C. Lovell, Elena Hernandez-Martinez, Federico Marinacci, David N. Spergel, Klaus Dolag, Lars Hernquist, Mark Vogelsberger

In particular, de Santi et al. (2023) developed models that could accurately infer the value of $\Omega_{\rm m}$ from catalogs that only contain the positions and radial velocities of galaxies that are robust to uncertainties in astrophysics and subgrid models.

Robust field-level inference with dark matter halos

no code implementations14 Sep 2022 Helen Shao, Francisco Villaescusa-Navarro, Pablo Villanueva-Domingo, Romain Teyssier, Lehman H. Garrison, Marco Gatti, Derek Inman, Yueying Ni, Ulrich P. Steinwandel, Mihir Kulkarni, Eli Visbal, Greg L. Bryan, Daniel Angles-Alcazar, Tiago Castro, Elena Hernandez-Martinez, Klaus Dolag

More importantly, we find that our models are very robust: they can infer the value of $\Omega_{\rm m}$ and $\sigma_8$ when tested using halo catalogues from thousands of N-body simulations run with five different N-body codes: Abacus, CUBEP$^3$M, Enzo, PKDGrav3, and Ramses.

Virgo: Scalable Unsupervised Classification of Cosmological Shock Waves

1 code implementation14 Aug 2022 Max Lamparth, Ludwig Böss, Ulrich Steinwandel, Klaus Dolag

Cosmological shock waves are essential to understanding the formation of cosmological structures.

Classification

Satellite galaxy abundance dependency on cosmology in Magneticum simulations

1 code implementation11 Oct 2021 Antonio Ragagnin, Alessandra Fumagalli, Tiago Castro, Klaus Dolag, Alexandro Saro, Matteo Costanzi, Sebastian Bocquet

Conclusions: This work provides a preliminary calibration of the cosmological dependency of the satellite abundance of high mass halos, and we showed that modelling HOD with cosmological parameters is necessary to interpret satellite abundance, and we showed the importance of using FP simulations in modelling this dependency.

GPR

A New View of Observed Galaxies through 3D Modelling and Visualisation

no code implementations3 Feb 2021 Tim Dykes, Claudio Gheller, Bärbel S. Koribalski, Klaus Dolag, Mel Krokos

Observational astronomers survey the sky in great detail to gain a better understanding of many types of astronomical phenomena.

Instrumentation and Methods for Astrophysics Graphics

High-Energy Neutrino Production in Clusters of Galaxies

no code implementations19 Jan 2021 Saqib Hussain, Rafael Alves Batista, Elisabete M. de Gouveia Dal Pino, Klaus Dolag

For CRs injected with a power-law energy spectrum $\propto E^{-2}$, we find that clusters contribute to the diffuse flux observed by the IceCube Neutrino Observatory with up to $\sim 20 \;\%$.

High Energy Astrophysical Phenomena Astrophysics of Galaxies

Impact of baryons in cosmic shear analyses with tomographic aperture mass statistics

1 code implementation17 Dec 2020 Nicolas Martinet, Tiago Castro, Joachim Harnois-Déraps, Eric Jullo, Carlo Giocoli, Klaus Dolag

However, baryons need to be accounted for at the percentage level for future Stage IV surveys and we propose to include the uncertainty on the AGN feedback amplitude by marginalizing over this parameter using multiple simulations such as those presented in this paper.

Cosmology and Nongalactic Astrophysics

Cosmic Shear Cosmology Beyond 2-Point Statistics: A Combined Peak Count and Correlation Function Analysis of DES-Y1

no code implementations4 Dec 2020 Joachim Harnois-Déraps, Nicolas Martinet, Tiago Castro, Klaus Dolag, Benjamin Giblin, Catherine Heymans, Hendrik Hildebrandt, Qianli Xia

With mock DES-Y1 data we calibrate the impact of photometric redshift and shear calibration uncertainty on the peak-count, marginalising over these uncertainties in our cosmological analysis.

Cosmology and Nongalactic Astrophysics

Peculiar Velocity Estimation from Kinetic SZ Effect using Deep Neural Networks

no code implementations8 Oct 2020 Yuyu Wang, Nesar Ramachandra, Edgar M. Salazar-Canizales, Hume A. Feldman, Richard Watkins, Klaus Dolag

The Sunyaev-Zel'dolvich (SZ) effect is expected to be instrumental in measuring velocities of distant clusters in near future telescope surveys.

Cosmology and Nongalactic Astrophysics

Stellar Property Statistics of Massive Halos from Cosmological Hydrodynamics Simulations: Common Kernel Shapes

no code implementations7 Jan 2020 Dhayaa Anbajagane, August E. Evrard, Arya Farahi, David J. Barnes, Klaus Dolag, Ian G. McCarthy, Dylan Nelson, Annalisa Pillepich

The highest resolution simulations find $\gamma \simeq -0. 8$ for the $z=0$ shape of $p(\ln M_{\star,\rm BCG}\,|\, M_{\rm halo}, z)$ and also that the fractional scatter in total stellar mass is below $10\%$ in halos more massive than $10^{14. 3} M_{\odot}$.

Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics

Using X-Ray Morphological Parameters to Strengthen Galaxy Cluster Mass Estimates via Machine Learning

no code implementations7 Aug 2019 Sheridan B. Green, Michelle Ntampaka, Daisuke Nagai, Lorenzo Lovisari, Klaus Dolag, Dominique Eckert, John A. ZuHone

This procedure is performed for two different mock observation series in an effort to bracket the potential enhancement in mass predictions that can be made possible by including dynamical state information.

Cosmology and Nongalactic Astrophysics

Numerical study of halo concentrations in dark-energy cosmologies

no code implementations29 Sep 2003 Klaus Dolag, Matthias Bartelmann, Francesca Perrotta, Carlo Baccigalupi, Lauro Moscardini, Massimo Meneghetti, Giuseppe Tormen

We study the concentration parameters, their mass dependence and redshift evolution, of dark-matter halos in different dark-energy cosmologies with constant and time-variable equation of state, and compare them with "standard'' Lambda-CDM and OCDM models.

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