no code implementations • 23 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.
1 code implementation • 29 Nov 2021 • Pablo Villanueva-Domingo, Francisco Villaescusa-Navarro, Shy Genel, Daniel Anglés-Alcázar, Lars Hernquist, Federico Marinacci, David N. Spergel, Mark Vogelsberger, Desika Narayanan
We present new constraints on the masses of the halos hosting the Milky Way and Andromeda galaxies derived using graph neural networks.
1 code implementation • 16 Nov 2021 • Pablo Villanueva-Domingo, Francisco Villaescusa-Navarro, Daniel Anglés-Alcázar, Shy Genel, Federico Marinacci, David N. Spergel, Lars Hernquist, Mark Vogelsberger, Romeel Dave, Desika Narayanan
Furthermore, a GNN trained on a suite of simulations is able to preserve part of its accuracy when tested on simulations run with a different code that utilizes a distinct subgrid physics model, showing the robustness of our method.
Ranked #1 on Graph Learning on CAMELS
1 code implementation • 5 Sep 2019 • Timo L. R. Halbesma, Robert J. J. Grand, Facundo A. Gómez, Federico Marinacci, Rüdiger Pakmor, Wilma H. Trick, Philipp Busch, Simon D. M. White
We find that the Auriga simulations do produce sufficient stellar mass for GC candidates at radii and metallicities that are typical for the MW GC system (GCS).
Astrophysics of Galaxies
no code implementations • 13 Dec 2018 • Dylan Nelson, Volker Springel, Annalisa Pillepich, Vicente Rodriguez-Gomez, Paul Torrey, Shy Genel, Mark Vogelsberger, Ruediger Pakmor, Federico Marinacci, Rainer Weinberger, Luke Kelley, Mark Lovell, Benedikt Diemer, Lars Hernquist
IllustrisTNG is a suite of large volume, cosmological, gravo-magnetohydrodynamical simulations run with the moving-mesh code Arepo.
Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics
2 code implementations • 24 Oct 2018 • Alexander H. Riley, Azadeh Fattahi, Andrew B. Pace, Louis E. Strigari, Carlos S. Frenk, Facundo A. Gómez, Robert J. J. Grand, Federico Marinacci, Julio F. Navarro, Rüdiger Pakmor, Christine M. Simpson, Simon D. M. White
We analyse the orbital kinematics of the Milky Way (MW) satellite system utilizing the latest systemic proper motions for 38 satellites based on data from $Gaia$ Data Release 2.
Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics
no code implementations • 12 Oct 2017 • Rainer Weinberger, Volker Springel, Rüdiger Pakmor, Dylan Nelson, Shy Genel, Annalisa Pillepich, Mark Vogelsberger, Federico Marinacci, Jill Naiman, Paul Torrey, Lars Hernquist
We show that the quenching of massive central galaxies happens coincidently with kinetic-mode feedback, consistent with the notion that active supermassive black cause the low specific star formation rates observed in massive galaxies.
Astrophysics of Galaxies High Energy Astrophysical Phenomena
no code implementations • 11 Jul 2017 • Jill P. Naiman, Annalisa Pillepich, Volker Springel, Enrico Ramirez-Ruiz, Paul Torrey, Mark Vogelsberger, Rüdiger Pakmor, Dylan Nelson, Federico Marinacci, Lars Hernquist, Rainer Weinberger, Shy Genel
To this end we use the magnesium to iron ratio as a proxy for the effects of our SNII and SNIa metal return prescription, and a means to compare our simulated abundances to a wide variety of galactic observations.
Astrophysics of Galaxies
no code implementations • 11 Jul 2017 • Volker Springel, Rüdiger Pakmor, Annalisa Pillepich, Rainer Weinberger, Dylan Nelson, Lars Hernquist, Mark Vogelsberger, Shy Genel, Paul Torrey, Federico Marinacci, Jill Naiman
The two-point correlation function of the simulated galaxies agrees well with SDSS at its mean redshift z ~ 0. 1, both as a function of stellar mass and when split according to galaxy colour, apart from a mild excess in the clustering of red galaxies in the stellar mass range 10^9-10^10 Msun/h^2.
Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics
no code implementations • 11 Jul 2017 • Dylan Nelson, Annalisa Pillepich, Volker Springel, Rainer Weinberger, Lars Hernquist, Ruediger Pakmor, Shy Genel, Paul Torrey, Mark Vogelsberger, Guinevere Kauffmann, Federico Marinacci, Jill Naiman
We find a striking improvement with respect to the original Illustris simulation, as well as excellent quantitative agreement in comparison to the observations, with a sharp transition in median color from blue to red at a characteristic M* ~ 10^10. 5 Msun.
Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics
no code implementations • 11 Jul 2017 • Annalisa Pillepich, Dylan Nelson, Lars Hernquist, Volker Springel, Rüdiger Pakmor, Paul Torrey, Rainer Weinberger, Shy Genel, Jill Naiman, Federico Marinacci, Mark Vogelsberger
Total halo mass is a very good predictor of stellar mass, and vice versa: at $z=0$, the 3D stellar mass measured within 30 kpc scales as $\propto (M_{\rm 500c})^{0. 49}$ with a $\sim 0. 12$ dex scatter.
Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics
no code implementations • 11 Jul 2017 • Federico Marinacci, Mark Vogelsberger, Rüdiger Pakmor, Paul Torrey, Volker Springel, Lars Hernquist, Dylan Nelson, Rainer Weinberger, Annalisa Pillepich, Jill Naiman, Shy Genel
Using two simple models for the energy distribution of relativistic electrons we predict the diffuse radio emission of $280$ clusters with a baryonic mass resolution of $1. 1\times 10^{7}\,{\rm M_{\odot}}$, and generate mock observations for VLA, LOFAR, ASKAP and SKA.
Cosmology and Nongalactic Astrophysics
no code implementations • 8 Mar 2017 • Annalisa Pillepich, Volker Springel, Dylan Nelson, Shy Genel, Jill Naiman, Ruediger Pakmor, Lars Hernquist, Paul Torrey, Mark Vogelsberger, Rainer Weinberger, Federico Marinacci
The overall framework builds upon the successes of the Illustris galaxy formation model, and includes prescriptions for star formation, stellar evolution, chemical enrichment, primordial and metal-line cooling of the gas, stellar feedback with galactic outflows, and black hole formation, growth and multi-mode feedback.
Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics