Speaker: Saurabh Saurabh (Max Planck Institut für Radioastronomie)
Title: Imaging ultra-compact objects with radiatively inefficient accretion flows
Abstract:
Recent Event Horizon Telescope (EHT) observations of M87* and Sgr A* provide
compelling evidence for the presence of supermassive black holes at their
respective cores. However, alternative models for these compact objects
remain plausible. In the talk, we will explore the observational signatures
of Joshi-Malafarina-Narayan (JMN-1) naked singularity (which emerges as an
end state of a continual gravitational collapse) by employing a semi-analytic
Radiatively Inefficient Accretion Flow (RIAF) model to generate synchrotron
emission images. Additionally I will talk about how the choice of magnetic
field configuration affects the polarised images in black hole images which
can further help in determining magnetic field topology near sources such as
Sgr A* and M87*.