Astrophysics of Radio Sources: Analysis of 21 cm Post-reionization Signals and Modeling of FRBs as PBHs with Magnetic Fields

Between the scientist’s theorizing and the Universe, there is the human codified data. Actually, data is the representation of the communication between nature and human beings through a certain type of view and information. The hard task of interpreting and understanding what the data means requires a huge and collective effort from the scientific community in different fields. Sometimes, a new scientific discovery comes from a theoretical prediction and needs a real observation to validate it. However, it frequently happens that new discoveries come from incidental observations with instruments developed for other goals. In the latter case, more information with new and independent observations should be needed to deeply investigate this possible new phenomenon and its theoretical description. Radioastronomy, since its origin, has been a fruitful field with a mix-up of theoretical and observational new discoveries. It happened, for instance, for the Fast Radio Bursts discovery through pulsar investigations. Hence, versatile and accurate radiotelescopes have been operating or are under development to be able to map huge sky swathes for large-scale investigations at the same as very precise pinpointing in the sky for small-scale searches; or else, different projects to be able to operate in interferometric observations composing as large as possible baseline with earth-dimensions. In this work, we will focus on describing briefly different types of astrophysical information that are observed when a radiotelescope operates in a 21-cm intensity mapping on large scales and how we can handle the images to extract the hidden 21-cm signal. In the last part of this work, we will interested in providing a new candidate to describe Fast Radio Bursts and their magnetic characteristic in addition to one most currently accepted and likely magnetar nature.