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Home  »  Colloquium   »   Extreme-UV photons from high redshift galaxies

Extreme-UV photons from high redshift galaxies


Title : Extreme-UV photons from high redshift galaxies.
Speaker : Prof. Kanak Saha, IUCAA.
Date : 23/02/2022, 05:30 PM , Online Mode.

About the speaker:

Prof. Kanak Saha is a renowned Astrophysicist from IUCAA, Pune.   After completing his Ph.D. from IISc Bangalore, Prof. Saha worked as a Humboldt fellow at MPE, Germany, and as Postdoctoral fellow at Academia Sinica Institute of Astronomy and Astrophysics, Taiwan. He also worked as Visiting fellow at Geneva Observatory in Switzerland and Space Telescope Science Institute, Baltimore, USA.  He joined IUCAA in 2013 as an Assistant Professor and is currently an Associate Professor.

His main area of research is in galaxy formation and evolution with a special focus on the high-redshift universe using state-of-the-art observing facilities. He is the recipient of the Shanti Swarup Bhatnagar Prize for the year 2021 in Physical Sciences for his breakthrough discovery of a faint galaxy at high redshift, detected by deep observations using India’s first space observatory, Astro Sat.

Title of the Talk:  Extreme-UV photons from high redshift galaxies


Soon after the Cosmic Dark Age, our universe transformed from neutral to ionized. Today, most of the matter between galaxies is ionized. It is believed that the extreme UV photons emitted by the first galaxies were responsible for the reionization of our universe. However, the nature of such galaxies remains elusive. In this talk, I plan to report the first discovery of a high-redshift galaxy, AUDFs01, emitting extreme UV photons at rest-frame 600 Angstrom. AUDFs01 is the first such galaxy from the Astro Sat UV deep field that was created based on observation carried out by the Ultraviolet Imaging Telescope on Astro Sat. The detection of extreme UV photons from distant galaxies would open up a new window to constrain the shape of the ionizing spectrum.