Extended ultraviolet emission in nearby galaxies

by Dr Rahna P T (Shanghai Astronomical Observatory)

Monday 9 Nov 2020, 14:00 → 15:00 Asia/Shanghai

DoA conference room (506)

Abstract

Star formation is one of the most important processes governing the galaxy evolution. The UV observations of GALEX led to the discovery of the UV bright emission in the extended disk of nearby galaxies (XUV galaxies). This outer disk star formation raises new questions about the nature of star formation in low-density environments. We have observed five early-type spiral galaxies using Ultraviolet imaging telescope (UVIT) to study their nature and outer disk star formation properties. These galaxies have excess UV emission in their outer disks in the form of spiral arms or arm fragments, complete or incomplete rings. UVIT is one of the five payloads in AstroSat observatory (India’s first multi-wavelength mission). UVIT provides a unique opportunity to study the UV sky simultaneously in three (UV to optical) channels with high spatial resolution. The deep and high spatial resolution of UVIT observations will enable us to reveal the extended UV structure and star-forming regions in the outer disk of nearby galaxies. In my talk, I will present the details about our UVIT observations, and the results obtained from our study. 

Biography

CV:

2014-2018, PhD, Christ University

2018-2019, Postdoc Fellow, Indian Institute of Astrophysics

2019 - Now, Postdoc Fellow, Shanghai Astronomical Observatory

Chair

Dr. Jiaxin Han

Division

Astronomy and Astrophysics