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PreprintCC BY 4.0arXiv

Mock catalogues for the DESI DR2 Milky Way mass modeling effort

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Abstract

The Dark Energy Spectroscopic Instrument (DESI) survey is an ongoing campaign to obtain millions of spectra, including for stars within the Milky Way. One of DESI's Key Projects for its second data release (DR2) is to measure the mass of the Milky Way using a variety of techniques applied to six-dimensional kinematics of distant halo stars. We present mock surveys generated from the Auriga cosmological simulations (AuriDESI) that are used to validate these techniques in several companion studies. The AuriDESI tracer catalogues are tailored to reflect key features of the DR2 Key Project dataset, including the selection of RR Lyrae and blue horizontal branch stars, uncertainties on line-of-sight velocities and proper motions, and variation in observational completeness within the survey footprint. We discuss how well the resulting AuriDESI tracer catalogues compare to their observed DESI counterparts, including suggesting improvements that can be generalized to similar mock survey efforts within the community. The AuriDESI tracer catalogues are publicly available on Zenodo.

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BibTeX
@misc{riley2026mock,
  title = {{Mock catalogues for the DESI DR2 Milky Way mass modeling effort}},
  author = {Alexander H. Riley and Amanda Byström and Gustavo E. Medina and Namitha Kizhuprakkat and Andrew P. Cooper and Sergey E. Koposov and T. M. Callingham and C. S. Frenk and Ting S. Li and G. Thomas and M. Valluri and Y. Zhou and J. Aguilar and S. Ahlen and F. Beutler and D. Bianchi and D. Brooks and A. Carnero Rosell and T. Claybaugh and A. Cuceu and K. S. Dawson and A. de la Macorra and Arjun Dey and Biprateep Dey and P. Doel and J. E. Forero-Romero and E. Gaztañaga and Satya Gontcho A Gontcho and G. Gutierrez and M. Ishak and J. Jimenez and R. Kehoe and A. Kremin and A. Lambert and M. Landriau and L. Le Guillou and A. Leauthaud and A. Meisner and R. Miquel and S. Nadathur and E. Paillas and W. J. Percival and F. Prada and I. Pérez-Ràfols and C. Ravoux and G. Rossi and L. Samushia and E. Sanchez and C. Saulder and D. Schlegel and M. Schubnell and R. Sharples and J. Silber and M. Siudek and G. Tarlé and B. A. Weaver and R. Zhou},
  howpublished = {arXiv},
  year = {2026},
  month = nov,
  doi = {10.48550/arxiv.2611.05519},
  eprint = {2611.05519},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2611.05519},
  note = {CC BY 4.0},
}
RIS
TY  - UNPB
TI  - Mock catalogues for the DESI DR2 Milky Way mass modeling effort
AU  - Alexander H. Riley
AU  - Amanda Byström
AU  - Gustavo E. Medina
AU  - Namitha Kizhuprakkat
AU  - Andrew P. Cooper
AU  - Sergey E. Koposov
AU  - T. M. Callingham
AU  - C. S. Frenk
AU  - Ting S. Li
AU  - G. Thomas
AU  - M. Valluri
AU  - Y. Zhou
AU  - J. Aguilar
AU  - S. Ahlen
AU  - F. Beutler
AU  - D. Bianchi
AU  - D. Brooks
AU  - A. Carnero Rosell
AU  - T. Claybaugh
AU  - A. Cuceu
AU  - K. S. Dawson
AU  - A. de la Macorra
AU  - Arjun Dey
AU  - Biprateep Dey
AU  - P. Doel
AU  - J. E. Forero-Romero
AU  - E. Gaztañaga
AU  - Satya Gontcho A Gontcho
AU  - G. Gutierrez
AU  - M. Ishak
AU  - J. Jimenez
AU  - R. Kehoe
AU  - A. Kremin
AU  - A. Lambert
AU  - M. Landriau
AU  - L. Le Guillou
AU  - A. Leauthaud
AU  - A. Meisner
AU  - R. Miquel
AU  - S. Nadathur
AU  - E. Paillas
AU  - W. J. Percival
AU  - F. Prada
AU  - I. Pérez-Ràfols
AU  - C. Ravoux
AU  - G. Rossi
AU  - L. Samushia
AU  - E. Sanchez
AU  - C. Saulder
AU  - D. Schlegel
AU  - M. Schubnell
AU  - R. Sharples
AU  - J. Silber
AU  - M. Siudek
AU  - G. Tarlé
AU  - B. A. Weaver
AU  - R. Zhou
PY  - 2026
DA  - 2026/11/03
PB  - arXiv
DO  - 10.48550/arxiv.2611.05519
UR  - https://arxiv.org/abs/2611.05519
AB  - The Dark Energy Spectroscopic Instrument (DESI) survey is an ongoing campaign to obtain millions of spectra, including for stars within the Milky Way. One of DESI's Key Projects for its second data release (DR2) is to measure the mass of the Milky Way using a variety of techniques applied to six-dimensional kinematics of distant halo stars. We present mock surveys generated from the Auriga cosmological simulations (AuriDESI) that are used to validate these techniques in several companion studies. The AuriDESI tracer catalogues are tailored to reflect key features of the DR2 Key Project dataset, including the selection of RR Lyrae and blue horizontal branch stars, uncertainties on line-of-sight velocities and proper motions, and variation in observational completeness within the survey footprint. We discuss how well the resulting AuriDESI tracer catalogues compare to their observed DESI counterparts, including suggesting improvements that can be generalized to similar mock survey efforts within the community. The AuriDESI tracer catalogues are publicly available on Zenodo.
ER  -