tokens: ACKNOWLEDGEMENTS We thank Phil Hopkins for providing us with the current version of gizmo , and are grateful to Alar Toomre and Scott Tremaine for illuminating discussions. This work has been partially supported by the Hubble Space Telescopr /STScI Theory grant AR-14584, and by JSPS KAKENHI grant number 16H02163 (to IS). IS is grateful for support from International Joint Research Promotion Program at Osaka University. The STScI is operated by the AURA, Inc., under NASA contract NAS5-26555. Simulations have been performed on the University of Kentucky DLX Cluster.
ner_tags: O O O B-Person I-Person O O O O O O O O B-Software O O O O O B-Person I-Person O B-Person I-Person O O O O O O O O O O O B-Grant I-Grant I-Grant I-Grant I-Grant I-Grant I-Grant O O B-Organization B-Grant I-Grant I-Grant I-Grant O B-Person B-Person O O O O O B-Grant I-Grant I-Grant I-Grant I-Grant O B-Organization I-Organization O B-Organization O O O O B-Organization I-Organization O B-Organization O B-Grant O O O O O O B-Organization I-Organization I-Organization B-ComputingFacility I-ComputingFacility