no code implementations • 9 May 2022 • Luisa Lucie-Smith, Susmita Adhikari, Risa H. Wechsler

We find two primary scales in the initial conditions (ICs) that impact the final mass profile: the density at approximately the scale of the haloes' Lagrangian patch $R_L$ ($R\sim 0. 7\, R_L$) and that in the large-scale environment ($R\sim 1. 7~R_L$).

1 code implementation • 26 Oct 2020 • Sebastian Wagner-Carena, Ji Won Park, Simon Birrer, Philip J. Marshall, Aaron Roodman, Risa H. Wechsler

We show that the posterior PDFs are sufficiently accurate (i. e., statistically consistent with the truth) across a wide variety of power-law elliptical lens mass distributions.

1 code implementation • 22 Apr 2019 • Ethan O. Nadler, Vera Gluscevic, Kimberly K. Boddy, Risa H. Wechsler

Alternatives to the cold, collisionless dark matter (DM) paradigm in which DM behaves as a collisional fluid generically suppress small-scale structure.

Cosmology and Nongalactic Astrophysics High Energy Physics - Phenomenology

2 code implementations • 8 Jan 2019 • Joseph DeRose, Risa H. Wechsler, Matthew R. Becker, Michael T. Busha, Eli S. Rykoff, Niall MacCrann, Brandon Erickson, August E. Evrard, Andrey Kravtsov, Daniel Gruen, Sahar Allam, Santiago Avila, Sarah Bridle, David Brooks, Elizabeth Buckley-Geer, Aurelio Carnero Rosell, Matias Carrasco Kind, Jorge Carretero, Francisco J. Castander, Ross Cawthon, Martin Crocce, Luiz N. da Costa, Christopher Davis, Juan De Vicente, Jörg P. Dietrich, Peter Doel, Alex Drlica-Wagner, Pablo Fosalba, Josh Frieman, Juan Garcia-Bellido, Gaston Gutierrez, Will G. Hartley, Devon L. Hollowood, Ben Hoyle, David J. James, Elisabeth Krause, Kyler Kuehn, Nikolay Kuropatkin, Marcos Lima, Marcio A. G. Maia, Felipe Menanteau, Christopher J. Miller, Ramon Miquel, Ricardo L. C. Ogando, Andrés Plazas Malagón, A. Kathy Romer, Eusebio Sanchez, Rafe Schindler, Santiago Serrano, Ignacio Sevilla-Noarbe, Mathew Smith, Eric Suchyta, Molly E. C. Swanson, Gregory Tarle, Vinu Vikram

We show that the weak-lensing shear catalog, redMaGiC galaxy catalogs and redMaPPer cluster catalogs provide plausible realizations of the same catalogs in the DES Y1 data by comparing their magnitude, color and redshift distributions, angular clustering, and mass-observable relations, making them useful for testing analyses that use these samples.

Cosmology and Nongalactic Astrophysics

1 code implementation • 14 Sep 2018 • Ethan O. Nadler, Yao-Yuan Mao, Gregory M. Green, Risa H. Wechsler

We develop a comprehensive and flexible model for the connection between satellite galaxies and dark matter subhalos in dark matter-only zoom-in simulations of Milky Way (MW)-mass host halos.

Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics

no code implementations • 31 Jul 2018 • Warren R. Morningstar, Yashar D. Hezaveh, Laurence Perreault Levasseur, Roger D. Blandford, Philip J. Marshall, Patrick Putzky, Risa H. Wechsler

We use convolutional neural networks (CNNs) and recurrent neural networks (RNNs) to estimate the parameters of strong gravitational lenses from interferometric observations.

Instrumentation and Methods for Astrophysics

no code implementations • 16 Apr 2018 • Joseph DeRose, Risa H. Wechsler, Jeremy L. Tinker, Matthew R. Becker, Yao-Yuan Mao, Thomas McClintock, Sean McLaughlin, Eduardo Rozo, Zhongxu Zhai

We show that these statistics are converged to 1% (2%) for halos with more than 500 (200) particles respectively and scales of r>200 ~ h^-1 kpc in real space or k ~ 3 h Mpc^-1 in harmonic space for z\le 1.

Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies

1 code implementation • 5 Feb 2018 • Yun Wang, Massimo Robberto, Mark Dickinson, Lynne A. Hillenbrand, Wesley Fraser, Peter Behroozi, Jarle Brinchmann, Chia-Hsun Chuang, Andrea Cimatti, Robert Content, Emanuele Daddi, Henry C. Ferguson, Christopher Hirata, Michael J. Hudson, J. Davy Kirkpatrick, Alvaro Orsi, Alice Shapley, Mario Ballardini, Robert Barkhouser, James Bartlett, Robert Benjamin, Ranga Chary, Charlie Conroy, Megan Donahue, Olivier Dore, Peter Eisenhardt, Karl Glazebrook, George Helou, Sangeeta Malhotra, Lauro Moscardini, Jeffrey A. Newman, Zoran Ninkov, Michael Ressler, James Rhoads, Jason Rhodes, Daniel Scolnic, Stephen Smee, Francesco Valentino, Risa H. Wechsler

ATLAS Probe will lead to transformative science over the entire range of astrophysics: from galaxy evolution to the dark Universe, from Solar System objects to the dusty regions of the Milky Way.

Instrumentation and Methods for Astrophysics Cosmology and Nongalactic Astrophysics Earth and Planetary Astrophysics Astrophysics of Galaxies Solar and Stellar Astrophysics

1 code implementation • 12 Dec 2017 • Ethan O. Nadler, Yao-Yuan Mao, Risa H. Wechsler, Shea Garrison-Kimmel, Andrew Wetzel

We identify subhalos in dark matter-only (DMO) zoom-in simulations that are likely to be disrupted due to baryonic effects by using a random forest classifier trained on two hydrodynamic simulations of Milky Way (MW)-mass host halos from the Latte suite of the Feedback in Realistic Environments (FIRE) project.

Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics

1 code implementation • 27 Sep 2017 • Yao-Yuan Mao, Eve Kovacs, Katrin Heitmann, Thomas D. Uram, Andrew J. Benson, Duncan Campbell, Sofía A. Cora, Joseph DeRose, Tiziana Di Matteo, Salman Habib, Andrew P. Hearin, J. Bryce Kalmbach, K. Simon Krughoff, François Lanusse, Zarija Lukić, Rachel Mandelbaum, Jeffrey A. Newman, Nelson Padilla, Enrique Paillas, Adrian Pope, Paul M. Ricker, Andrés N. Ruiz, Ananth Tenneti, Cristian Vega-Martínez, Risa H. Wechsler, Rongpu Zhou, Ying Zu, for the LSST Dark Energy Science Collaboration

The use of high-quality simulated sky catalogs is essential for the success of cosmological surveys.

Instrumentation and Methods for Astrophysics Cosmology and Nongalactic Astrophysics

no code implementations • 1 Sep 2017 • Mariangela Lisanti, Siddharth Mishra-Sharma, Nicholas L. Rodd, Benjamin R. Safdi, Risa H. Wechsler

Applying this procedure to a catalog of sources, one can create a full-sky map of the brightest extragalactic dark matter targets in the nearby Universe ($z\lesssim 0. 03$), supplementing sources of dark matter annihilation from within the Local Group.

Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena High Energy Physics - Phenomenology

no code implementations • 29 Aug 2017 • Laurence Perreault Levasseur, Yashar D. Hezaveh, Risa H. Wechsler

In Hezaveh et al. 2017 we showed that deep learning can be used for model parameter estimation and trained convolutional neural networks to determine the parameters of strong gravitational lensing systems.

Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics

1 code implementation • 28 Oct 2016 • Ashley Perko, Leonardo Senatore, Elise Jennings, Risa H. Wechsler

The Effective Field Theory of Large-Scale Structure (EFTofLSS) provides a novel formalism that is able to accurately predict the clustering of large-scale structure (LSS) in the mildly non-linear regime.

Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology High Energy Physics - Phenomenology High Energy Physics - Theory

1 code implementation • 30 Mar 2015 • Tony Y. Li, Risa H. Wechsler, Kiruthika Devaraj, Sarah E. Church

Here we present predictions for the intensity map and power spectrum of the CO(1-0) line from galaxies at z ~ 2. 4 -2. 8, based on a parameterized model for the galaxy-halo connection, and demonstrate the extent to which properties of high-redshift galaxies can be directly inferred from such observations.

Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies

2 code implementations • 19 Oct 2011 • Peter S. Behroozi, Risa H. Wechsler, Hao-Yi Wu, Michael T. Busha, Anatoly A. Klypin, Joel R. Primack

We find that both the ROCKSTAR and BDM halo finders track halos extremely well; in both, the number of halos which do not have physically consistent progenitors is at the 1-2% level across all halo masses.

Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics

4 code implementations • 19 Oct 2011 • Peter S. Behroozi, Risa H. Wechsler, Hao-Yi Wu

We present a new algorithm for identifying dark matter halos, substructure, and tidal features.

Cosmology and Nongalactic Astrophysics Instrumentation and Methods for Astrophysics

1 code implementation • 27 Aug 2009 • David W. Gerdes, Adam J. Sypniewski, Timothy A. McKay, Jiangang Hao, Matthew R. Weis, Risa H. Wechsler, Michael T. Busha

Precision photometric redshifts will be essential for extracting cosmological parameters from the next generation of wide-area imaging surveys.

Cosmology and Nongalactic Astrophysics

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