tokens: ACKNOWLEDGEMENTS We are grateful to the reviewer for his/her useful comments. We thank Volker Springel for kindly providing the simulation code arepo and Thomas Greif for providing the outputs of his simulations. This study was supported by World Premier International Research Center Initiative (WPI), MEXT, Japan and by SPPEXA through JST CREST JPMHCR1414. SI receives the funding from KAKENHI Grant-in-Aid for Young Scientists (B), No. 17K17677. Final note: This letter is dedicated to our friend and colleague Dr. Thomas H. Greif (1981–2019).
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