Mergers of Luminous Early-type Galaxies in the Local Universe and Implication for Gravitational Wave Background Zhonglue Wen (NAO Fengshan Liu Jinlin Han China), (Shenyang Normal University, China), (NAO China) merging of black holes in galaxies conference, Australia, 17/06/2008 Why merger of galaxies is interesting Star formation in ... We aim to construct a large and volume-limited complete massive early-type galaxy mergers! ... 2007) Process of SMBHs merging (Begelman et al. ...

metrologia The leap second: its history and possible future R. A. Nelson, D. D. McCarthy , S. Malys, J. Levine, B. Guinot, H. F. Fliegel , R. L. Beard and T. R. Bartholome w Abstract. This paper reviews the theoretica l motivatio n for the leap second in the context of the historica l evolutio n of time measurement . Th e periodic insertio n of a leap second step into th e scale of Coordinate d Universal Time (UTC) necessitates frequent changes in comple x timekeepin g systems an d is currentl y th e