Abstract Details
| Name: Sabyasachi Chattopadhyay Affiliation: IUCAA Conference ID: ASI2017_691 Title : IFU System for DOTIFS - Creation and Deployment Authors and Co-Authors : Mr. Sabyasachi Chattopadhyay Email: sabyasachi@iucaa.in Primary Author, Contact Author Primary Affiliation: Inter-University Centre for Astronomy and Astrophysics Dr. A. N. Ramaprakash Email: anr@iucaa.in Co-Author Primary Affiliation: Inter-University Centre for Astronomy and Astrophysics Dr. Vishal Joshi Email: vjoshi@prl.res.in Co- Author Primary Affiliation: Physical Research Laboratory Mr. Pravin Khodade Email: pravin_khodade@iucaa.in Co-Author Primary Affiliation: Inter-University Centre for Astronomy and Astrophysics Mr. Chaitanya V. Rajarshi Email: cvr@iucaa.in Co-Author Primary Affiliation: Inter-University Centre for Astronomy and Astrophysics Mr. Haeun Chung Email: hchung@astro.snu.ac.kr Co-Author Primary Affiliation: Seoul National University Abstract Type : Oral Abstract Category : Instrumentation and Techniques Abstract : Devasthal Optical Telescope Integral Field Spectrograph (DOTIFS) is a new multi-object integral field spectrograph being built by the Inter-University Centre for Astronomy and Astrophysics (IUCAA), Pune, India for the 3.6m Devasthal Optical Telescope, (DOT). The Devasthal Observatory is being constructed by the Aryabhatta Research Institute of Observational Sciences (ARIES), Nainital. DOTIFS is mainly designed to study the physics and kinematics of ionized gas, star formation and H II regions in the nearby galaxies. DOTIFS is a novel instrument in terms of multi-IFUs, built in deployment system, and high throughput. A magnifier at the Cassegrain side port of the telescope feeds sixteen integral field units (IFUs). Each IFU is comprised of a microlens array and optical fibers offering 144 spaxels at a sampling of 0.8†per 300μm hexagonal microlens and a total field of view of 7.2†× 8.4â€. The fibres feed eight identical spectrographs that will produce 2,304 spectra at R~1800, over a wavelength range of 370-740nm in a single exposure. The sampling scale can be changed by changing the magnifier and/or by dithered observations and proper data process. The IFUs can be deployed over an 8’ diameter focal plane by x-y actuators. An intelligent deployment algorithm has been developed to allow optimized reconfiguration and to avoid any collision between IFUs. The whole deployment system has a complex 3-dimensional structure to allow maximum positioning freedom to the IFUs. It has wide deployable area relative to each IFU’s field of view, and doesn’t require any direct human interaction for the deployment. This system is one of the big technical challenges of this project. Here we present the concept of creating IFU using an indigenous method as well as how to deploy them in the field of view in accordance with astronomical target object distribution. The instrument is at the phase of fabrication and is scheduled to be commissioned in early 2017. |