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AbacusHOD: a highly efficient extended multitracer HOD framework and its application to BOSS and eBOSS data

Yuan, Sihan; Garrison, Lehman H; Hadzhiyska, Boryana; Bose, Sownak; Eisenstein, Daniel J

AbacusHOD: a highly efficient extended multitracer HOD framework and its application to BOSS and eBOSS data Thumbnail


Sihan Yuan

Lehman H Garrison

Boryana Hadzhiyska

Daniel J Eisenstein


We introduce the ABACUSHOD model and present two applications of ABACUSHOD and the ABACUSSUMMIT simulations to observations. ABACUSHOD is a Halo Occupation Distribution (HOD) framework written in PYTHON that is particle-based, multitracer, highly generalized, and highly efficient. It is designed specifically with multitracer/cosmology analyses for next-generation large-scale structure surveys in mind, and takes advantage of the volume and precision offered by the new state-of-the-art ABACUSSUMMIT cosmological simulations. The model is also highly customizable and should be broadly applicable to any upcoming surveys and a diverse range of cosmological analyses. In this paper, we demonstrate the capabilities of the ABACUSHOD framework through two example applications. The first example demonstrates the high efficiency and the large HOD extension feature set through an analysis of full-shape redshift-space clustering of BOSS galaxies at intermediate to small scales (⁠<30h−1 Mpc), assessing the necessity of introducing secondary galaxy biases (assembly bias). We find strong evidence for using halo environment instead of concentration to trace secondary galaxy bias, a result which also leads to a moderate reduction in the ‘lensing is low’ tension. The second example demonstrates the multitracer capabilities of the ABACUSHOD package through an analysis of the extended Baryon Oscillation Spectroscopic Survey cross-correlation measurements between three different galaxy tracers: luminous red galaxies, emission-line galaxies, and quasi-stellar objects. We expect the ABACUSHOD framework, in combination with the ABACUSSUMMIT simulation suite, to play an important role in a simulation-based analysis of the upcoming Dark Energy Spectroscopic Instrument data sets.


Yuan, S., Garrison, L. H., Hadzhiyska, B., Bose, S., & Eisenstein, D. J. (2022). AbacusHOD: a highly efficient extended multitracer HOD framework and its application to BOSS and eBOSS data. Monthly Notices of the Royal Astronomical Society, 510(3), 3301-3320.

Journal Article Type Article
Acceptance Date Nov 16, 2021
Online Publication Date Nov 29, 2021
Publication Date 2022-03
Deposit Date Jun 13, 2022
Publicly Available Date Jun 13, 2022
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 510
Issue 3
Pages 3301-3320


Published Journal Article (2.7 Mb)

Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2021 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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