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Characterization of DESI fiber assignment incompleteness effect on 2-point clustering and mitigation methods for DR1 analysis

Bianchi, D. [Milan U.] (ORCID:0000000197120006)·Hanif, M. M.S. [Michigan U.; KEK, Tsukuba; Hiroshima Shudo U.] (ORCID:0009000625835006)·Carnero Rosell, A. [Laguna U., Tenerife; IAC, La Laguna] (ORCID:0000000330445150)·Lasker, J. [Southern Methodist U.; Columbia U.] (ORCID:0000000329994873)·Ross, A. J. [Chicago U., KICP; Ohio State U., Dept. Astron.; Ohio State U.] (ORCID:0000000275229083)·Pinon, M. [IRFU, Saclay] (ORCID:0009000932287126)·de Mattia, A. [IRFU, Saclay] (ORCID:0000000309202947)·White, M. [UC, Berkeley; BCCP, Berkeley] (ORCID:0000000199125070)·Ahlen, S. [Boston U.] (ORCID:0000000160987247)·Bailey, S. [LBL, Berkeley] (ORCID:0000000341626619)·Brooks, D. [University Coll. London]·Burtin, E. [IRFU, Saclay]·Chaussidon, E. [LBL, Berkeley] (ORCID:0000000189964874)·Claybaugh, T. [LBL, Berkeley]·Cole, S. [Durham U., ICC] (ORCID:0000000259547903)·de la Macorra, A. [UNAM, Mexico] (ORCID:0000000217691640)·Ferraro, S. [LBL, Berkeley; BCCP, Berkeley] (ORCID:0000000349927854)·Font-Ribera, A. [University Coll. London; Barcelona, IFAE] (ORCID:0000000230337312)·Forero-Romero, J. E. [Andes U., Bogota] (ORCID:0000000228903725)·Gaztañaga, E. [Barcelona, IEEC; Portsmouth U., ICG; ICE, Bellaterra]·Gontcho A. Gontcho, S. [LBL, Berkeley] (ORCID:000000033142233X)·Gutierrez, G. [Fermilab] (ORCID:0000000308250517)·Guy, J. [LBL, Berkeley] (ORCID:0000000198226793)·Hahn, C. [Princeton U.] (ORCID:0000000311970902)·Honscheid, K. [Chicago U., KICP; Ohio State U.] (ORCID:0000000265502023)·Howlett, C. [Queensland U.] (ORCID:0000000210819410)·Juneau, S. [Natl. Solar Observ., Tucson] (ORCID:0000000200002394)·Kirkby, D. [UC, Irvine] (ORCID:0000000288285463)·Kisner, T. [LBL, Berkeley] (ORCID:0000000335107134)·Kremin, A. [LBL, Berkeley] (ORCID:0000000163567424)·Landriau, M. [LBL, Berkeley] (ORCID:0000000318388528)·Le Guillou, L. [LPNHE, Paris] (ORCID:0000000171788868)·Levi, M. E. [LBL, Berkeley] (ORCID:0000000318871018)·McDonald, P. [LBL, Berkeley] (ORCID:0000000183468394)·Meisner, A. [Natl. Solar Observ., Tucson] (ORCID:0000000211257384)·Miquel, R. [ICREA, Barcelona; Barcelona, IFAE]·Moustakas, J. [Siena Coll., Loudonville] (ORCID:0000000227334559)·Palanque-Delabrouille, N. [IRFU, Saclay; LBL, Berkeley] (ORCID:000000033188784X)·Percival, W. J. [Waterloo U.; Perimeter Inst. Theor. Phys.] (ORCID:0000000206445727)·Prada, F. [Granada U., Theor. Phys. Astrophys.] (ORCID:0000000171458674)·Pérez-Ràfols, I. [Barcelona, Polytechnic U.] (ORCID:0000000169790125)·Raichoor, A. [LBL, Berkeley] (ORCID:0000000159997923)·Rossi, G. [Sejong U.]·Sanchez, E. [Madrid, CIEMAT] (ORCID:0000000296468198)·Schlegel, D. [LBL, Berkeley]·Schubnell, M. [U. Michigan, Ann Arbor; Michigan U.; KEK, Tsukuba; Hiroshima Shudo U.]·Sharples, R. [Durham U.; Durham U., ICC] (ORCID:0000000334498583)·Silber, J. [LBL, Berkeley] (ORCID:0000000234610320)·Sprayberry, D. [Natl. Solar Observ., Tucson]·Tarlé, G. [Michigan U.; KEK, Tsukuba; Hiroshima Shudo U.] (ORCID:0000000317040781)·Vargas-Magaña, M. [UNAM, Mexico] (ORCID:0000000338411836)·Weaver, B. A. [Natl. Solar Observ., Tucson]·Zarrouk, P. [LPNHE, Paris] (ORCID:0000000273059578)·Zhou, R. [LBL, Berkeley] (ORCID:0000000153814372)·Zou, H. [Beijing Observ.] (ORCID:0000000266843997)
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Abstract

We present an in-depth analysis of the fiber assignment incompleteness in the Dark EnergySpectroscopic Instrument (DESI) Data Release 1 (DR1). This incompleteness is caused by therestricted mobility of the robotic fiber positioner in the DESI focal plane, which limits thenumber of galaxies that can be observed at the same time, especially at small angular separations.As a result, the observed clustering amplitude is suppressed in a scale-dependent manner, which,if not addressed, can severely impact the inference of cosmological parameters. We discuss themethods adopted for simulating fiber assignment on mocks and data. In particular, we introducethe fast fiber assignment (FFA) emulator, which was employed to obtain the power spectrumcovariance adopted for the DR1 full-shape analysis. We present the mitigation techniques,organised in two classes: measurement stage and model stage. We then use high fidelity mocks as areference to quantify both the accuracy of the FFA emulator and the effectiveness of the differentmeasurement-stage mitigation techniques. This complements the studies conducted in a parallelpaper for the model-stage techniques, namely the θ-cut approach. We find that pairwiseinverse probability (PIP) weights with angular upweighting recover the “true” clustering in allthe cases considered, in both Fourier and configuration space. Notably, we present the first everpower spectrum measurement with PIP weights from real data.

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Bianchi, D. [Milan U.] (ORCID:0000000197120006), Hanif, M. M.S. [Michigan U.; KEK, Tsukuba; Hiroshima Shudo U.] (ORCID:0009000625835006), Carnero Rosell, A. [Laguna U., Tenerife; IAC, La Laguna] (ORCID:0000000330445150), Lasker, J. [Southern Methodist U.; Columbia U.] (ORCID:0000000329994873), Ross, A. J. [Chicago U., KICP; Ohio State U., Dept. Astron.; Ohio State U.] (ORCID:0000000275229083), Pinon, M. [IRFU, Saclay] (ORCID:0009000932287126), de Mattia, A. [IRFU, Saclay] (ORCID:0000000309202947), White, M. [UC, Berkeley; BCCP, Berkeley] (ORCID:0000000199125070), Ahlen, S. [Boston U.] (ORCID:0000000160987247), Bailey, S. [LBL, Berkeley] (ORCID:0000000341626619), Brooks, D. [University Coll. London], Burtin, E. [IRFU, Saclay], Chaussidon, E. [LBL, Berkeley] (ORCID:0000000189964874), Claybaugh, T. [LBL, Berkeley], Cole, S. [Durham U., ICC] (ORCID:0000000259547903), de la Macorra, A. [UNAM, Mexico] (ORCID:0000000217691640), Ferraro, S. [LBL, Berkeley; BCCP, Berkeley] (ORCID:0000000349927854), Font-Ribera, A. [University Coll. London; Barcelona, IFAE] (ORCID:0000000230337312), Forero-Romero, J. E. [Andes U., Bogota] (ORCID:0000000228903725), Gaztañaga, E. [Barcelona, IEEC; Portsmouth U., ICG; ICE, Bellaterra], Gontcho A. Gontcho, S. [LBL, Berkeley] (ORCID:000000033142233X), Gutierrez, G. [Fermilab] (ORCID:0000000308250517), Guy, J. [LBL, Berkeley] (ORCID:0000000198226793), Hahn, C. [Princeton U.] (ORCID:0000000311970902), Honscheid, K. [Chicago U., KICP; Ohio State U.] (ORCID:0000000265502023), Howlett, C. [Queensland U.] (ORCID:0000000210819410), Juneau, S. [Natl. Solar Observ., Tucson] (ORCID:0000000200002394), Kirkby, D. [UC, Irvine] (ORCID:0000000288285463), Kisner, T. [LBL, Berkeley] (ORCID:0000000335107134), Kremin, A. [LBL, Berkeley] (ORCID:0000000163567424), Landriau, M. [LBL, Berkeley] (ORCID:0000000318388528), Le Guillou, L. [LPNHE, Paris] (ORCID:0000000171788868), Levi, M. E. [LBL, Berkeley] (ORCID:0000000318871018), McDonald, P. [LBL, Berkeley] (ORCID:0000000183468394), Meisner, A. [Natl. Solar Observ., Tucson] (ORCID:0000000211257384), Miquel, R. [ICREA, Barcelona; Barcelona, IFAE], Moustakas, J. [Siena Coll., Loudonville] (ORCID:0000000227334559), Palanque-Delabrouille, N. [IRFU, Saclay; LBL, Berkeley] (ORCID:000000033188784X), Percival, W. J. [Waterloo U.; Perimeter Inst. Theor. Phys.] (ORCID:0000000206445727), Prada, F. [Granada U., Theor. Phys. Astrophys.] (ORCID:0000000171458674), Pérez-Ràfols, I. [Barcelona, Polytechnic U.] (ORCID:0000000169790125), Raichoor, A. [LBL, Berkeley] (ORCID:0000000159997923), Rossi, G. [Sejong U.], Sanchez, E. [Madrid, CIEMAT] (ORCID:0000000296468198), Schlegel, D. [LBL, Berkeley], Schubnell, M. [U. Michigan, Ann Arbor; Michigan U.; KEK, Tsukuba; Hiroshima Shudo U.], Sharples, R. [Durham U.; Durham U., ICC] (ORCID:0000000334498583), Silber, J. [LBL, Berkeley] (ORCID:0000000234610320), Sprayberry, D. [Natl. Solar Observ., Tucson], Tarlé, G. [Michigan U.; KEK, Tsukuba; Hiroshima Shudo U.] (ORCID:0000000317040781), Vargas-Magaña, M. [UNAM, Mexico] (ORCID:0000000338411836), Weaver, B. A. [Natl. Solar Observ., Tucson], Zarrouk, P. [LPNHE, Paris] (ORCID:0000000273059578), Zhou, R. [LBL, Berkeley] (ORCID:0000000153814372), Zou, H. [Beijing Observ.] (ORCID:0000000266843997). 2025-04-29. Characterization of DESI fiber assignment incompleteness effect on 2-point clustering and mitigation methods for DR1 analysis. https://doi.org/10.48550/arxiv.2411.12025

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