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

[Astronomy seminar announcements]

On 2019-03-04 11:19 , Alexis Brandeker wrote:
> 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)
> 29/3 (Fri) @ 10:30 : Emilia Kilpua (Helsinki)
>
> All welcome!
>      Alexis Brandeker (Astronomy seminar organiser VT 2019)
>