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10 papers · 1 filter
Alignments of Group Galaxies with Neighboring Groups
Yougang Wang, Changbom Park, Xiaohu Yang +2
Using a sample of galaxy groups found in the Sloan Digital Sky Survey Data Release 4, we measure the following four types of alignment signals: (1) the alignment between the distri…
Seoul National University Bright Quasar Survey in Optical (SNUQSO) I: First Phase Observations and Results
Induk Lee, Myungshin Im, Minjin Kim +7
We present results from the first phase of the Seoul National University Bright Quasar Survey in Optical (SNUQSO) as well as its basic observational setup. Previous and current lar…
Galaxy Orbits for Galaxy Clusters in Sloan Digital Sky Survey and 2dF Galaxy Redshift Survey
Ho Seong Hwang, Myung Gyoon Lee
We present the results of a study for galaxy orbits in galaxy clusters using a spectroscopic sample of galaxies in Sloan Digital Sky Survey (SDSS) and 2dF Galaxy Redshift Survey (2…
Theoretic Limits on the Equation of State Parameter of Quintessence
Qing-Guo Huang
The value of scalar field coupled to gravity should be less than the Planck scale in the consistent theory of quantum gravity. It provides a theoretic constraint on the equation of…
Transformation of Morphology and Luminosity Classes of the SDSS Galaxies
Changbom Park, J. Richard Gott, Yun-Young Choi
We present a unified picture on the evolution of galaxy luminosity and morphology. Galaxy morphology is found to depend critically on the local environment set up by the nearest ne…
Quintessential Kination and Leptogenesis
Eung Jin Chun, Stefano Scopel
Thermal leptogenesis induced by the CP-violating decay of a right-handed neutrino (RHN) is discussed in the background of quintessential kination, i.e., in a cosmological model whe…