"Emission Line Searches for High-Redshift Galaxies With ALMA" & "Modeling Ice Formation in Molecular Clouds"
|Date/Time:||Friday, 03 Sep 2010 from 4:10 pm to 5:00 pm|
Justin Spilker: "Emission Line Searches for High-Redshift Galaxies With ALMA"
Abstract: I will present a simulation of a spectral line observation of a field of spiral galaxies at high redshift using the Atacama Large Millimeter/submillimeter Array (ALMA), obtained by making use of the virtual galaxy catalog developed by Obreschkow et al. as part of the Square Kilometer Array Simulated Skies project. This method selects galaxies with high star formation rates and calculates continuum and C II 1900GHz line fluxes for each galaxy before simulating an observation at 234GHz. Two objects in an approximately one square arcminute field are easily detected at a redshift of z ~ 7.26, indicating that while a large scale survey will be necessary to build up a signicant sample size of these very distant galaxies, this task is well within ALMA's technical capabilities. Such a survey would yield valuable information about the formation and evolution of galaxies and large scale structure in the universe, and also give details of the epoch of the reionization of the intergalactic medium. I will also discuss the various selection effects used to constrain the simulation to be computationally feasible, as well as potential problems future surveys may encounter.
Tyler Pauly: "Modeling Ice Formation in Molecular Clouds"
Abstract: Using a kinetic chemical model to simulate a dark molecular cloud, observed levels of organic ice composition are reproduced for the first time. This required adjusting initial elemental abundances, adding reactions to an existing chemical network, and adding more realistic behavior to surface chemistry.