Probing the Shadow Image of the Sagittarius A* with Event Horizon
  Telescope
  Recent observations of the Milky-way galactic center at various frequencies
suggest a supermassive compact object. Generally, that supermassive compact
object is assumed to be a `Black Hole', having more than four million solar
masses. In this work, we study the observational appearance at $230$ GHz and
probe the nature of Sagittarius-A* (Sgr A*) as the naked singularity. Here, we
consider the first type of Joshi-Malafarina-Narayan (JMN-1) and
Janis-Newman-Winicour (JNW) naked singularity spacetimes which are anisotropic
fluid solutions of the Einstein field equations. Motivated by radiatively
inefficient accretion flows (RIAF), we use an analytical model for emission and
absorption coefficients to solve the general relativistic radiative transfer
equation. The resulting emission is then utilized to generate images to predict
the nature of the Sgr A* with synthetic Very Long Baseline Interferometry
(VLBI) images from current and future Event Horizon Telescope (EHT) arrays.
Three different EHT array configurations are being used to simulate the models
of naked singularities and a black hole. This may have little effect on the
baseline, but it would increase the u-v plane gridding, making it feasible to
capture a better-resolved image. Therefore, it is quite interesting and useful
for the upcoming shadow image of the Sgr A* to predict whether it is a
supermassive black hole or a naked singularity.
