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Title: Can assembly bias explain the lensing amplitude of the BOSS CMASS sample in a Planck cosmology?

Abstract

ABSTRACT In this paper, we investigate whether galaxy assembly bias can reconcile the 20–40 $${{\ \rm per\ cent}}$$ disagreement between the observed galaxy projected clustering signal and the galaxy–galaxy lensing signal in the Baryon Oscillation Spectroscopic Survey CMASS galaxy sample. We use the suite of abacuscosmos lambda cold dark matter simulations at Planck best-fitting cosmology and two flexible implementations of extended halo occupation distribution (HOD) models that incorporate galaxy assembly bias to build forward models and produce joint fits of the observed galaxy clustering signal and the galaxy–galaxy lensing signal. We find that our models using the standard HODs without any assembly bias generalizations continue to show a 20–40 $${{\ \rm per\ cent}}$$ overprediction of the observed galaxy–galaxy lensing signal. We find that our implementations of galaxy assembly bias do not reconcile the two measurements at Planck best-fitting cosmology. In fact, despite incorporating galaxy assembly bias, the satellite distribution parameter, and the satellite velocity bias parameter into our extended HOD model, our fits still strongly suggest a $$\sim \! 34{{\ \rm per\ cent}}$$ discrepancy between the observed projected clustering and galaxy–galaxy lensing measurements. It remains to be seen whether a combination of other galaxy assembly bias models, alternative cosmological parameters, or baryonic effects can explain the amplitude difference between the two signals.

Authors:
ORCiD logo [1];  [1]; ORCiD logo [2]
  1. Harvard–Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
  2. Department of Astronomy and Astrophysics, University of California, Santa Cruz, 1156 High Street, Santa Cruz, CA 95064, USA
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1606596
Grant/Contract Number:  
SC0013718; SC0019301
Resource Type:
Published Article
Journal Name:
Monthly Notices of the Royal Astronomical Society
Additional Journal Information:
Journal Name: Monthly Notices of the Royal Astronomical Society Journal Volume: 493 Journal Issue: 4; Journal ID: ISSN 0035-8711
Publisher:
Oxford University Press
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Yuan, Sihan, Eisenstein, Daniel J., and Leauthaud, Alexie. Can assembly bias explain the lensing amplitude of the BOSS CMASS sample in a Planck cosmology?. United Kingdom: N. p., 2020. Web. doi:10.1093/mnras/staa634.
Yuan, Sihan, Eisenstein, Daniel J., & Leauthaud, Alexie. Can assembly bias explain the lensing amplitude of the BOSS CMASS sample in a Planck cosmology?. United Kingdom. doi:https://doi.org/10.1093/mnras/staa634
Yuan, Sihan, Eisenstein, Daniel J., and Leauthaud, Alexie. Mon . "Can assembly bias explain the lensing amplitude of the BOSS CMASS sample in a Planck cosmology?". United Kingdom. doi:https://doi.org/10.1093/mnras/staa634.
@article{osti_1606596,
title = {Can assembly bias explain the lensing amplitude of the BOSS CMASS sample in a Planck cosmology?},
author = {Yuan, Sihan and Eisenstein, Daniel J. and Leauthaud, Alexie},
abstractNote = {ABSTRACT In this paper, we investigate whether galaxy assembly bias can reconcile the 20–40 ${{\ \rm per\ cent}}$ disagreement between the observed galaxy projected clustering signal and the galaxy–galaxy lensing signal in the Baryon Oscillation Spectroscopic Survey CMASS galaxy sample. We use the suite of abacuscosmos lambda cold dark matter simulations at Planck best-fitting cosmology and two flexible implementations of extended halo occupation distribution (HOD) models that incorporate galaxy assembly bias to build forward models and produce joint fits of the observed galaxy clustering signal and the galaxy–galaxy lensing signal. We find that our models using the standard HODs without any assembly bias generalizations continue to show a 20–40 ${{\ \rm per\ cent}}$ overprediction of the observed galaxy–galaxy lensing signal. We find that our implementations of galaxy assembly bias do not reconcile the two measurements at Planck best-fitting cosmology. In fact, despite incorporating galaxy assembly bias, the satellite distribution parameter, and the satellite velocity bias parameter into our extended HOD model, our fits still strongly suggest a $\sim \! 34{{\ \rm per\ cent}}$ discrepancy between the observed projected clustering and galaxy–galaxy lensing measurements. It remains to be seen whether a combination of other galaxy assembly bias models, alternative cosmological parameters, or baryonic effects can explain the amplitude difference between the two signals.},
doi = {10.1093/mnras/staa634},
journal = {Monthly Notices of the Royal Astronomical Society},
number = 4,
volume = 493,
place = {United Kingdom},
year = {2020},
month = {3}
}

Journal Article:
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DOI: https://doi.org/10.1093/mnras/staa634

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