Cross-correlation of the extragalactic gamma-ray background with the thermal Sunyaev-Zel’dovich effect in the cosmic microwave background

Shirasaki, Masato; Macias, Oscar; Ando, Shin’ichiro; Horiuchi, Shunsaku; Yoshida, Naoki

doi:10.1103/physrevd.101.103022

Cross-correlation of the extragalactic gamma-ray background with the thermal Sunyaev-Zel’dovich effect in the cosmic microwave background

Journal Article · Mon May 18 00:00:00 EDT 2020 · Physical Review D

DOI:https://doi.org/10.1103/physrevd.101.103022· OSTI ID:1803941

^[1]; ^[2]; Ando, Shin’ichiro ^[3]; Horiuchi, Shunsaku ^[4]; Yoshida, Naoki ^[5]

National Astronomical Observatory of Japan (NAOJ), Tokyo (Japan); OSTI
Univ. of Tokyo (Japan); Univ. of Amsterdam (Netherlands)
Univ. of Amsterdam (Netherlands); Univ. of Tokyo (Japan)
Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
Univ. of Tokyo (Japan)

Cosmic rays in galaxy clusters are unique probes of energetic processes operating with large-scale structures in the Universe. Precise measurements of cosmic rays in galaxy clusters are essential for improving our understanding of nonthermal components in the intracluster medium (ICM) as well as the accuracy of cluster mass estimates in cosmological analyses. In this paper, we perform a cross-correlation analysis with the extragalactic gamma-ray background and the thermal Sunyaev-Zeldovich (tSZ) effect in the cosmic microwave background. The expected cross-correlation signal would contain rich information about the cosmic-ray-induced gamma-ray emission in the most massive galaxy clusters at $$\textit{z}$$ ~ 0.1 – 0.2 . We analyze the gamma-ray background map with 8 years of data taken by the Large Area Telescope onboard Fermi satellite and the publicly available tSZ map by Planck. We confirm that the measured cross-correlation is consistent with a null detection, and thus it enables us to put the tightest constraint on the acceleration efficiency of cosmic-ray protons at shocks in and around galaxy clusters. In this work, we find the acceleration efficiency must be below 5% with a 2σ confidence level when the hydrostatic mass bias of clusters is assumed to be 30%, and our result is not significantly affected by the assumed value of the hydrostatic mass bias. Our constraint implies that the nonthermal cosmic-ray pressure in the ICM can introduce only a≲3% level of the hydrostatic mass bias, highlighting that cosmic rays alone do not account for the mass bias inferred by the Planck analyses. Finally, we discuss future detectability prospects of cosmic-ray-induced gamma rays from the Perseus cluster for the Cherenkov Telescope Array.

View Accepted Manuscript (DOE)

Research Organization:: Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)

Sponsoring Organization:: Japan Society for the Promotion of Science (JSPS); Ministry of Education, Culture, Sports, Science and Technology (MEXT); National Science Foundation (NSF); USDOE Office of Science (SC); World Premier International Research Center Initiative (WPI Initiative)

Grant/Contract Number:: SC0020262

OSTI ID:: 1803941

Journal Information:: Physical Review D, Journal Name: Physical Review D Journal Issue: 10 Vol. 101; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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