Astronomy and Astrophysics Seminars

Extragalactic Science Results with integral field spectrographs: GMOS and MUSE

by Dr. Nimisha Kumari (Institute of Astronomy, University of Cambridge, UK)

Friday, September 28, 2018 from to (Asia/Kolkata)
at DAA Seminar Room ( A269 )
Description
  Integral field spectroscopy (IFS) has revolutionised the field of astronomy as it provides a three-dimensional view of extended objects, like planetary nebulae, star-forming regions, galaxies, clusters of stars and galaxies. IFS is the best available technique to study the galaxies hosting star-forming regions, because it not only allows us to access information encoded in the emission lines from the star-forming regions, but also enables us to map their distribution and varying properties throughout each system. The speaker will present the extragalactic science results using two IFS facilities, Gemini Multi-Object Spectrograph (GMOS) employing fibres and lenselets and Multi-Unit Spectroscopic Explorer based on the image-slicer technique. She will present IFS observations from the GMOS to study the distribution of physical and chemical properties of H II regions in a sample of Blue Compact Dwarfs, the local analogues of high redshift galaxies. She will also discuss results from the analysis of the IFS observations of nearby spiral galaxies from the MUSE, where she has devised metallicity calibration for diffuse ionised gas applicable to a wide variety of galaxies. The eventual aim of such studies is to shed light on several secrets of the key mechanisms involved in galaxy formation and evolution.