Measurement of redshift-dependent cross-correlation of HSC clusters and Fermi γ-rays
[4];
- Department of Physics, Nagoya University, Nagoya, Aichi 464-8602, Japan
- Department of Physics, Nagoya University, Nagoya, Aichi 464-8602, Japan, Institute for Advanced Research, Nagoya University, Nagoya, Aichi 464-8602, Japan
- National Astronomical Observatory of Japan (NAOJ), Mitaka, Tokyo 181-8588, Japan
- Center for Neutrino Physics, Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
- Research Centre for the Early Universe, University of Tokyo, Tokyo 113-0033, Japan, Department of Physics, University of Tokyo, Tokyo 113-0033, Japan, Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU, WPI), University of Tokyo, Chiba 277-8582, Japan
The cross-correlation study of the unresolved γ-ray background (UGRB) with galaxy clusters has the potential to reveal the nature of the UGRB. In this paper, we perform a cross-correlation analysis between γ-ray data by the Fermi Large Area Telescope and a galaxy cluster catalogue from the Subaru Hyper Suprime-Cam (HSC) survey. The Subaru HSC cluster catalogue provides a wide and homogeneous large-scale structure distribution out to a high redshift at z = 1.1, which has not been accessible in previous cross-correlation studies. We conduct the cross-correlation analysis not only for clusters in the all-redshift range (0.1 < z < 1.1) of the survey, but also for subsamples of clusters divided into redshift bins, the low-redshift bin (0.1 < z < 0.6) and the high-redshift bin (0.6 < z < 1.1), to utilize the wide redshift coverage of the cluster catalogue. We find evidence of cross-correlation signals with the significance of 2.0σ–2.3σ for all-redshift and low-redshift cluster samples. On the other hand, for high-redshift clusters, we find a signal with a weaker significance level (1.6σ–1.9σ). We also compare the observed cross-correlation functions with predictions of a theoretical model in which the UGRB originates from γ-ray emitters such as blazars, star-forming galaxies, and radio galaxies. Finally, we find that the detected signal is consistent with the model prediction.
- Research Organization:
- Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); National Science Foundation (NSF); National Aeronautics and Space Administration (NASA); MEXT KAKENHI; JSPS KAKENHI
- Grant/Contract Number:
- SC0018327; 16H01096; 15K17646; 17H01110; NNX08AR22G; AST-1238877
- OSTI ID:
- 1494865
- Alternate ID(s):
- OSTI ID: 1612933
- Journal Information:
- Monthly Notices of the Royal Astronomical Society, Journal Name: Monthly Notices of the Royal Astronomical Society Vol. 484 Journal Issue: 4; ISSN 0035-8711
- Publisher:
- Royal Astronomical SocietyCopyright Statement
- Country of Publication:
- United Kingdom
- Language:
- English
Web of Science
Similar Records
HSC-XXL: Baryon budget of the 136 XXL groups and clusters
Survey of Gravitationally lensed Objects in HSC Imaging (SuGOHI) – V. Group-to-cluster scale lens search from the HSC–SSP Survey