TY - JOUR
T1 - Baryonic effects on CMB lensing and neutrino mass constraints
AU - Chung, Eegene
AU - Foreman, Simon
AU - Van Engelen, Alexander
N1 - Funding Information:
We thank Marcel van Daalen for providing BAHAMAS power spectra and Francisco Villaescusa-Navarro for measuring and providing IllustrisTNG power spectra used in this work. We also thank the OWLS and Horizon-AGN teams for making their power spectra publicly available, and Mat Madhavacheril both for making his forecasting code publicly available and for general discussion. We thank Nam Nguyen and Neelima Sehgal for the CMB-HD error bars from Ref. . We thank John Dubinski for patient and essential computing support. E. C. was supported by an Undergraduate Student Research Award from the Natural Sciences and Engineering Research Council, held at the Canadian Institute for Theoretical Astrophysics. Research at Perimeter Institute is supported in part by the Government of Canada through the Department of Innovation, Science and Economic Development Canada and by the Province of Ontario through the Ministry of Colleges and Universities.
Publisher Copyright:
© 2020 American Physical Society.
PY - 2020/3/15
Y1 - 2020/3/15
N2 - Measurements of gravitational lensing of the cosmic microwave background (CMB) hold the promise of yielding unique insights into cosmology at high redshift. Uncertainties due to baryonic effects associated with galaxy formation and evolution, including gas cooling, star formation, and feedback from active galactic nuclei (AGN) and supernovae, have typically been neglected when forecasting the sensitivity of future CMB surveys. In this paper, we determine the impact of these effects using four suites of hydrodynamical simulations which incorporate various prescriptions for baryonic processes, namely OWLS, BAHAMAS, Horizon, and IllustrisTNG. Our analysis shows characteristic power suppressions of several percent in CMB lensing due to baryonic effects, compared to dark-matter only simulations, at experimentally observable angular scales. We investigate the associated bias in the inferred neutrino mass for experiments like the upcoming Simons Observatory and CMB-S4. Depending on the experimental precision and the strength of the baryonic feedback within the simulations, biases in the neutrino mass sum show significant dispersion, ranging from very small to an overestimation by 1.1σ. We conclude that baryonic effects will likely be non-negligible for a detection of neutrino mass using CMB lensing.
AB - Measurements of gravitational lensing of the cosmic microwave background (CMB) hold the promise of yielding unique insights into cosmology at high redshift. Uncertainties due to baryonic effects associated with galaxy formation and evolution, including gas cooling, star formation, and feedback from active galactic nuclei (AGN) and supernovae, have typically been neglected when forecasting the sensitivity of future CMB surveys. In this paper, we determine the impact of these effects using four suites of hydrodynamical simulations which incorporate various prescriptions for baryonic processes, namely OWLS, BAHAMAS, Horizon, and IllustrisTNG. Our analysis shows characteristic power suppressions of several percent in CMB lensing due to baryonic effects, compared to dark-matter only simulations, at experimentally observable angular scales. We investigate the associated bias in the inferred neutrino mass for experiments like the upcoming Simons Observatory and CMB-S4. Depending on the experimental precision and the strength of the baryonic feedback within the simulations, biases in the neutrino mass sum show significant dispersion, ranging from very small to an overestimation by 1.1σ. We conclude that baryonic effects will likely be non-negligible for a detection of neutrino mass using CMB lensing.
UR - http://www.scopus.com/inward/record.url?scp=85083557161&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85083557161&partnerID=8YFLogxK
U2 - 10.1103/PhysRevD.101.063534
DO - 10.1103/PhysRevD.101.063534
M3 - Article
AN - SCOPUS:85083557161
SN - 2470-0010
VL - 101
JO - Physical Review D
JF - Physical Review D
IS - 6
M1 - 063534
ER -