COSMOLOGY @ KASI

Overview

Cosmology group at KASI is growing very fast with currently 9 members working on different topics in theoretical and observational cosmology. The group is expected to be expanded up to 17~18 members by 2018. At the current status, there are three faculties in the cosmology group namely Dr. Yong-Seon Song (PI), Dr. Ki-Young Choi and Dr. Arman Shafieloo, and Prof. Eric Linder as a visiting scientist is in close contact with the group.

In next couple of years there will be postdoctoral job offerings every year and applicants for graduate studies can apply to the group to do their Ph.D with one of the faculties through University of Science and Technology in Daejeon. The group is also planning to hire one more faculty by 2016 or 2017.

Partnership in Major International Surveys

CosKASI is a member of two major stage IV wide deep field surveys. CosKASI signs MoU with DESI in 2014. Dr. Yong-Seon Song is a charging person who serves for the membership committee and works for galaxy clustering working group and provides the theoretical templates to analyse RSD data. Dr. Arman Shafieloo works as a collaborating member who seeks for science contributions in diverse working groups. Both Dr. Yong-Seon Song and Dr. Arman Shafieloo plan to join Korean Participation Group for LSST (KPG for LSST). The MoA will be signed up between KPG for LSST and LSST in coming months. In addition, CosKASI makes an effort to organise science and instrument researchers for WFIRST participation. It will open new window at near infrared wavelength cosmology.

Prior to WFIRST participation, we will study potentials of doing cosmology with KASI's own space telescope NISS. NISS is a near infrared wavelength space telescope expected to be launched in 2017 to provide data from galaxies at star forming regions. This is worth mentioning that KASI has a substantial contribution to GMT in design and instrumentation and we seek to find ways to do cosmology using GMT when the telescope is ready.

Currently KASI hosts and participates in Gemini, JCMT and ALMA. CosKASI members have privileges to submit proposals to use these telescope. Recently, we proposed to JCMT SCUBA-2 to observe three distant clusters, IDCS- J1426.5+3508, ISCS J1432.4+3250, MOO-J1049+0038, at 1.2

Computing Facilities

KASI provides the high performance computing facilities. POLARIS is the name of the third generation of the HPC cluster in the KASI. It is composed of one frontend node (IBM System x3750 M4), 35 compute nodes (IBM System x3530 M4). The frontend has four Intel Xeon E5-4650 processors (8 cores per processor) and 96GB memory. Each compute node has two Intel Xeon E5-2470 processors (8 cores per processor) and 48 GB memory. The total number of cores and memory are 592 and 1776 GB. The frontend and compute nodes are connected with a FDR (56Gbit/sec) Infiniband switch. The total disk space is around 500TB. The POLARIS cluster was built with the research budget from the Korea Astronomy and Space Science Institute. It is mainly used by KASI researchers who are doing numerical simulations and data processing. The cluster resources are open for the internal KASI members.

In addition, there is a computing institute KISTI which opens to all institutes in the same research park. KISTI is a government-funded research institute designed to maximize the efficiency of science and technology R&D and support high-tech R&D for researchers. KISTI has laid the foundation for sophisticated R&D by collecting science and technology information from countries around the world and providing the information to companies and research institutions, with providing 300,000 high performance computing nodes.