[Astronomy seminar] Astronomy seminar Friday 10:30 FC61: Sambit Giri

[Astronomy seminar announcements]

Time & location: Friday 8/3, 10:30 in FC61

Speaker: Sambit Giri (SU)

Title: Tomographic studies of 21-cm signal during reionization

Abstract:
The formation of the first luminous sources in the Universe, such as the 
first generation of stars and accreting black holes, led to the 
ionization of hydrogen gas present in the intergalactic medium (IGM). 
This period in which the Universe transitioned from a cold and neutral 
state to a predominantly hot and ionized state is known as the Epoch of 
Reionization (EoR). The EoR is one of the least understood epochs in the 
Universe's evolution mostly due to the lack of direct observations. We 
can probe the reionization process with the  21-cm signal, produced by 
the spin-flip transition in neutral hydrogen. However, current radio 
telescopes have not been able to detect this faint signal. The 
low-frequency component of the Square Kilometre Array (SKA-Low), will be 
sensitive enough not only to detect the 21-cm signal produced during EoR 
but also to produce images of its distribution on the sky. A sequence of 
such 21-cm images from different redshifts will constitute a 
three-dimensional, tomographic, data set. Before the SKA comes online, 
it is prudent to develop methods to analyse these tomographic images in 
a statistical sense. In this seminar, I will describe the EoR 
information encoded in the 21-cm signal and present the tomographic 
analysis methods that will be useful to decode this information.

Other Friday activities in March:

15/3 (Fri) @ 10:30 : Richard Anderson (ESO)
15/3 (Fri) @ 13:00 : PhD defence Ruben Asensio Torres (SU)
22/3 (Fri) @ 13:00 : PhD defence Tine Libbrecht (SU)
29/3 (Fri) @ 10:30 : Emilia Kilpua (Helsinki)

All welcome!
      Alexis Brandeker (Astronomy seminar organiser VT 2019)