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Activity in galactic nuclei of cluster and field galaxies in the local universe
Ho Seong Hwang, Changbom Park, David Elbaz +1
We study the environmental effects on the activity in galactic nuclei by comparing galaxies in clusters and in the field. Using a spectroscopic sample of galaxies in Abell clusters…
Probing Dark Energy with Alpha Shapes and Betti Numbers
Rien van de Weygaert, Pratyush Pranav, Bernard J. T. Jones +8
We introduce a new descriptor of the weblike pattern in the distribution of galaxies and matter: the scale dependent Betti numbers which formalize the topological information conte…
Dependence of Barred Galaxy Fraction on Galaxy Properties and Environment
Gwang-Ho Lee, Changbom Park, Myung Gyoon Lee +1
We investigate the dependence of occurrence of bars in galaxies on galaxy properties and environment. We use a volume-limited sample of 33,391 galaxies brighter than $M_{r}=-19.5+5…
Measures of Galaxy Environment - I. What is "Environment"?
Stuart I. Muldrew, Darren J. Croton, Ramin A. Skibba +19
The influence of a galaxy's environment on its evolution has been studied and compared extensively in the literature, although differing techniques are often used to define environ…
Cosmic Voids in Sloan Digital Sky Survey Data Release 7
Danny C. Pan, Michael S. Vogeley, Fiona Hoyle +2
We study the distribution of cosmic voids and void galaxies using Sloan Digital Sky Survey Data Release 7 (SDSS DR7). Using the VoidFinder algorithm as described by Hoyle 2002, we…
The galactic spin of AGN galaxies
Bernardo Cervantes-Sodi, X. Hernandez, Changbom Park +1
Using an extensive sample of galaxies selected from the Sloan Digital Sky Survey Data Release 5, we compare the angular momentum distribution of active galactic nucleus (AGN) with…