Seeing The Universe Through 21-Cm Radiation

2023-03-01 Prof. Samir Choudhuri, IIT Madras

ABSTRACT :

Modern cosmology mainly deals with the origin and evolution of the Universe. Various observational detections (e.g., CMBR, galaxy survey) probe the Universe at different stages of time. The 21-cm signal from neutral hydrogen is another important tool that can be used to study the Universe over a large time period. It also contains a wealth of cosmological and astrophysical information. But, the problem is particularly challenging due to the presence of strong foregrounds. In this talk, I will present the global effort toward the detection of this faint signal using radio telescopes. We have also developed a novel estimator (namely Tapered Gridded Estimator: TGE) to detect this 21-cm signal in the presence of strong foreground sources. I will discuss the formalism and the effectiveness of the TGE, which is relevant for the present and future 21-cm studies.

Event Name

Seminars

Place

HSB 210 [S. N. Bose Hall]

Start Time

16:00

End Time

17:00

External Link

PDF to Talk