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Upcoming Seminar/Colloqium


Extragalactic Astrophysics in the context of 4-m ILMT

Speaker : Vibhore Negi
Affiliation : ARIES
Date & Time :
Venue : Zoom
Abstract :

The 4-m International Liquid Mirror Telescope (ILMT) installation activities have recently been completed at the Devasthal observatory (Uttarakhand, India). The ILMT will perform continuous observation of a narrow strip of the sky (∼27′) passing over the zenith in the SDSS g′, r′ and i′ bands using the liquid mirror technology and a special mode of observation known as the Time Delay Integration (TDI) technique. Since the traditional data reduction techniques are not sufficiently efficient and accurate for this observing mode, we are working on a data reduction pipeline that will be used to reduce and analyse CCD frames obtained in the TDI mode. I will discuss the methodology involved in the ILMT data reduction pipeline including precise astrometry and photometry and some results obtained using TDI mode observations.
Further, I will be discussing another project where we have worked on investigating the optical flux and colour variability of blazars in the ZTF survey. Optical flux and colour variability have long been a subject of blazar research as they afford a unique perspective on accretion disc and jet physics and might constrain the origin of corresponding brightness variations, even when restricted to the optical band. However, despite several efforts, a clear picture has not been established yet. Therefore, we investigate for the first time whether there is a universality in the colour behaviour of the blazars with the largest homogeneous sample taken to date. The key results of the project will be discussed. The above two projects are part of my PhD thesis entitled “Extragalactic Astrophysics in the context of the 4-m International Liquid Mirror Telescope.” 

About Speaker :

Vibhore Negi is a PhD student at ARIES. This seminar forms a part of his annual review.