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Unbiased clustering estimates with the DESI fibre assignment

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Unbiased clustering estimates with the DESI fibre assignment. / Bianchi, Davide; Burden, Angela; Percival, Will J.; Brooks, David; Cahn, Robert N.; Forero-Romero, Jaime E.; Levi, Michael; Ross, Ashley J.; Tarle, Gregory.

In: Monthly Notices of the Royal Astronomical Society, Vol. 481, No. 2, 01.12.2018, p. 2338-2348.

Research output: Contribution to journalArticlepeer-review

Harvard

Bianchi, D, Burden, A, Percival, WJ, Brooks, D, Cahn, RN, Forero-Romero, JE, Levi, M, Ross, AJ & Tarle, G 2018, 'Unbiased clustering estimates with the DESI fibre assignment', Monthly Notices of the Royal Astronomical Society, vol. 481, no. 2, pp. 2338-2348. https://doi.org/10.1093/MNRAS/STY2377

APA

Bianchi, D., Burden, A., Percival, W. J., Brooks, D., Cahn, R. N., Forero-Romero, J. E., Levi, M., Ross, A. J., & Tarle, G. (2018). Unbiased clustering estimates with the DESI fibre assignment. Monthly Notices of the Royal Astronomical Society, 481(2), 2338-2348. https://doi.org/10.1093/MNRAS/STY2377

Vancouver

Bianchi D, Burden A, Percival WJ, Brooks D, Cahn RN, Forero-Romero JE et al. Unbiased clustering estimates with the DESI fibre assignment. Monthly Notices of the Royal Astronomical Society. 2018 Dec 1;481(2):2338-2348. https://doi.org/10.1093/MNRAS/STY2377

Author

Bianchi, Davide ; Burden, Angela ; Percival, Will J. ; Brooks, David ; Cahn, Robert N. ; Forero-Romero, Jaime E. ; Levi, Michael ; Ross, Ashley J. ; Tarle, Gregory. / Unbiased clustering estimates with the DESI fibre assignment. In: Monthly Notices of the Royal Astronomical Society. 2018 ; Vol. 481, No. 2. pp. 2338-2348.

Bibtex

@article{68e5b8fa4463428ab048cf18b158908b,
title = "Unbiased clustering estimates with the DESI fibre assignment",
abstract = "The Emission Line Galaxy survey made by the Dark Energy Spectroscopic Instrument (DESI) survey will be created from five passes of the instrument on the sky. On each pass, the constrained mobility of the ends of the fibres in the DESI focal plane means that the angular distribution of targets that can be observed is limited. Thus, the clustering of samples constructed using a limited number of passes will be strongly affected by missing targets. In two recent papers, we showed how the effect of missing galaxies can be corrected when calculating the correlation function using a weighting scheme for pairs. Using mock galaxy catalogues we now show that this method provides an unbiased estimator of the true correlation function for the DESI survey after any number of passes. We use multiple mocks to determine the expected errors given one to four passes, compared to an idealized survey observing an equivalent number of randomly selected targets. On BAO scales, we find that the error is a factor of 2 worse after one pass, but that after three or more passes, the errors are very similar. Thus, we find that the fibre assignment strategy enforced by the design of DESI will not affect the cosmological measurements to be made by the survey, and can be removed as a potential risk for this experiment.",
keywords = "Large, Methods: statistical, Scale structure of Universe, RCUK, STFC, ST/N000668/1, ST/N00180X/1",
author = "Davide Bianchi and Angela Burden and Percival, {Will J.} and David Brooks and Cahn, {Robert N.} and Forero-Romero, {Jaime E.} and Michael Levi and Ross, {Ashley J.} and Gregory Tarle",
year = "2018",
month = dec,
day = "1",
doi = "10.1093/MNRAS/STY2377",
language = "English",
volume = "481",
pages = "2338--2348",
journal = "MNRAS",
issn = "0035-8711",
publisher = "Oxford University Press",
number = "2",

}

RIS

TY - JOUR

T1 - Unbiased clustering estimates with the DESI fibre assignment

AU - Bianchi, Davide

AU - Burden, Angela

AU - Percival, Will J.

AU - Brooks, David

AU - Cahn, Robert N.

AU - Forero-Romero, Jaime E.

AU - Levi, Michael

AU - Ross, Ashley J.

AU - Tarle, Gregory

PY - 2018/12/1

Y1 - 2018/12/1

N2 - The Emission Line Galaxy survey made by the Dark Energy Spectroscopic Instrument (DESI) survey will be created from five passes of the instrument on the sky. On each pass, the constrained mobility of the ends of the fibres in the DESI focal plane means that the angular distribution of targets that can be observed is limited. Thus, the clustering of samples constructed using a limited number of passes will be strongly affected by missing targets. In two recent papers, we showed how the effect of missing galaxies can be corrected when calculating the correlation function using a weighting scheme for pairs. Using mock galaxy catalogues we now show that this method provides an unbiased estimator of the true correlation function for the DESI survey after any number of passes. We use multiple mocks to determine the expected errors given one to four passes, compared to an idealized survey observing an equivalent number of randomly selected targets. On BAO scales, we find that the error is a factor of 2 worse after one pass, but that after three or more passes, the errors are very similar. Thus, we find that the fibre assignment strategy enforced by the design of DESI will not affect the cosmological measurements to be made by the survey, and can be removed as a potential risk for this experiment.

AB - The Emission Line Galaxy survey made by the Dark Energy Spectroscopic Instrument (DESI) survey will be created from five passes of the instrument on the sky. On each pass, the constrained mobility of the ends of the fibres in the DESI focal plane means that the angular distribution of targets that can be observed is limited. Thus, the clustering of samples constructed using a limited number of passes will be strongly affected by missing targets. In two recent papers, we showed how the effect of missing galaxies can be corrected when calculating the correlation function using a weighting scheme for pairs. Using mock galaxy catalogues we now show that this method provides an unbiased estimator of the true correlation function for the DESI survey after any number of passes. We use multiple mocks to determine the expected errors given one to four passes, compared to an idealized survey observing an equivalent number of randomly selected targets. On BAO scales, we find that the error is a factor of 2 worse after one pass, but that after three or more passes, the errors are very similar. Thus, we find that the fibre assignment strategy enforced by the design of DESI will not affect the cosmological measurements to be made by the survey, and can be removed as a potential risk for this experiment.

KW - Large

KW - Methods: statistical

KW - Scale structure of Universe

KW - RCUK

KW - STFC

KW - ST/N000668/1

KW - ST/N00180X/1

UR - http://www.scopus.com/inward/record.url?scp=85058719646&partnerID=8YFLogxK

U2 - 10.1093/MNRAS/STY2377

DO - 10.1093/MNRAS/STY2377

M3 - Article

AN - SCOPUS:85058719646

VL - 481

SP - 2338

EP - 2348

JO - MNRAS

JF - MNRAS

SN - 0035-8711

IS - 2

ER -

ID: 15861893