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AuriDESI: mock catalogues for the DESI Milky Way Survey

Kizhuprakkat, Namitha; Cooper, Andrew P; Riley, Alexander H; Koposov, Sergey E; Aguilar, Jessica Nicole; Ahlen, Steven; Allende Prieto, Carlos; Brooks, David; Claybaugh, Todd; Dawson, Kyle; de la Macorra, Axel; Doel, Peter; Forero-Romero, Jaime E; Frenk, Carlos; Gaztañaga, Enrique; Gnedin, Oleg Y; Grand, Robert J J; Gontcho A Gontcho, Satya; Honscheid, Klaus; Kehoe, Robert; Landriau, Martin; Manera, Marc; Meisner, Aaron; Miquel, Ramon; Nie, Jundan; Prada, Francisco; Rezaie, Mehdi; Rossi, Graziano; Sanchez, Eusebio; Schubnell, Michael; Seo, Hee-Jong; Tarlé, Gregory; Valluri, Monica; Zhou, Zhimin

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Authors

Namitha Kizhuprakkat

Andrew P Cooper

Sergey E Koposov

Jessica Nicole Aguilar

Steven Ahlen

Carlos Allende Prieto

David Brooks

Todd Claybaugh

Kyle Dawson

Axel de la Macorra

Peter Doel

Jaime E Forero-Romero

Enrique Gaztañaga

Oleg Y Gnedin

Robert J J Grand

Satya Gontcho A Gontcho

Klaus Honscheid

Robert Kehoe

Martin Landriau

Marc Manera

Aaron Meisner

Ramon Miquel

Jundan Nie

Francisco Prada

Mehdi Rezaie

Graziano Rossi

Eusebio Sanchez

Michael Schubnell

Hee-Jong Seo

Gregory Tarlé

Monica Valluri

Zhimin Zhou



Abstract

The Dark Energy Spectroscopic Instrument Milky Way Survey (DESI MWS) will explore the assembly history of the Milky Way by characterizing remnants of ancient dwarf galaxy accretion events and improving constraints on the distribution of dark matter in the outer halo. We present mock catalogues that reproduce the selection criteria of MWS and the format of the final MWS data set. These catalogues can be used to test methods for quantifying the properties of stellar halo substructure and reconstructing the Milky Way’s accretion history with the MWS data, including the effects of halo-to-halo variance. The mock catalogues are based on a phase-space kernel expansion technique applied to star particles in the Auriga suite of six high-resolution lambda-cold dark matter magnetohydrodynamic zoom-in simulations. They include photometric properties (and associated errors) used in DESI target selection and the outputs of the MWS spectral analysis pipeline (radial velocity, metallicity, surface gravity, and temperature). They also include information from the underlying simulation, such as the total gravitational potential and information on the progenitors of accreted halo stars. We discuss how the subset of halo stars observable by MWS in these simulations corresponds to their true content and properties. These mock Milky Ways have rich accretion histories, resulting in a large number of substructures that span the whole stellar halo out to large distances and have substantial overlap in the space of orbital energy and angular momentum.

Citation

Kizhuprakkat, N., Cooper, A. P., Riley, A. H., Koposov, S. E., Aguilar, J. N., Ahlen, S., Allende Prieto, C., Brooks, D., Claybaugh, T., Dawson, K., de la Macorra, A., Doel, P., Forero-Romero, J. E., Frenk, C., Gaztañaga, E., Gnedin, O. Y., Grand, R. J. J., Gontcho A Gontcho, S., Honscheid, K., Kehoe, R., …Zhou, Z. (2024). AuriDESI: mock catalogues for the DESI Milky Way Survey. Monthly Notices of the Royal Astronomical Society, 531(4), 4108-4137. https://doi.org/10.1093/mnras/stae1415

Journal Article Type Article
Acceptance Date Jun 3, 2024
Online Publication Date Jun 7, 2024
Publication Date 2024-07
Deposit Date Jul 30, 2024
Publicly Available Date Jul 30, 2024
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 531
Issue 4
Pages 4108-4137
DOI https://doi.org/10.1093/mnras/stae1415
Public URL https://durham-repository.worktribe.com/output/2641082

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