Abstract Details
| Name: Kshitija Kelkar Affiliation: Raman Research Institute Conference ID: ASI2018_1702 Title : Evolving galaxies in evolving environments Authors and Co-Authors : K.S. Dwarakanath (Raman Research Institute); A. Aragon-Salamanca (University of Nottingham); M. E. Gray (University of Nottingham) Y. L. Jaffe (ESO Chile) Abstract Type : Contributed Talk Abstract Category : Extragalactic astronomy Abstract : Upon accretion into clusters, environment is found to have little eff ect on the main structural properties of the galaxies such as their sizes for a given mass and morphology, and their internal structure but a ffects the morphological mix and star formation history of galaxies. This suggest that the plausible mechanisms driving this transformation must influence the gas in the galaxies. However when we consider galaxies under the impact of complex environment brought about by cluster merger, gravitational eff ects may be stronger, and thus alter observed structural and star formation properties of cluster galaxies. This talk will focus on understanding the effect of evolving environment on the star formation history and morphological transformation of galaxies through a detailed analysis of spectroscopic derivatives, morphology, internal galaxy structure and ICM properties. Utilising the cluster sample from the ESO Distant Cluster Survey (EDisCS) at 0.8 > z > 0.4, I shall present some innovative methods to define galaxy structure beyond the regular framework of Hubble morphologies, and link it with the star-formation history as a function of global (cluster/ field) environment. Further, I will focus on the resulting implications of the structural transformation of galaxies, when affected by the more complex internal cluster environment (through projected phase-space of clusters), on the probable mechanisms leading to the cessation of star formation observed in cluster galaxy population. Next, I will discuss the ramifications of evolving environment brought about by cluster merging phenomenon on the inherent cluster galaxy populations by introducing an ongoing study of a unique merging cluster system A3376 at z=0.046. With the aim of understanding how star formation may be influenced in merging clusters, I shall present preliminary results involving star formation properties of member galaxies especially around merger shock front through a multiwavelength approach, and discuss prospective physical mechanisms behind galaxy evolution in dynamic environments. |