The study of the angular and spatial distribution of radio selected AGNs
  and star-forming galaxies in the ELAIS N1 field
  The cosmic evolution of bias of different source populations with underlying
dark matter density field in post reionization era can shed light on large
scale structures. Studying the angular and spatial distribution of different
compact sources using deep radio catalogue at low-frequency is essential to
understand the matter distribution of the present Universe. Here, we
investigate the relationship of luminous matter with their host dark matter
haloes by measuring the angular and spatial clustering of sources (two-point
statistics), using deep radio observation of ELAIS N1 (EN1) field with upgraded
Giant Metrewave Radio Telescope (uGMRT) at 300-500 MHz. We also analyze the 612
MHz GMRT archival data of the same field to understand the cosmic evolution of
clustering of different source populations. We classify the sources as
star-forming galaxies (SFGs) and active galactic nuclei (AGN) based on their
radio luminosity. We find that the spatial clustering length and bias to the
dark matter density field of SFGs are smaller than AGNs at both frequencies.
This proves that AGNs are mainly hosted by massive haloes and hence strongly
clustered. However, a small decrease in the bias for both kind of sources at
higher frequency indicates that we are most likely tracing the faint objects
residing in less massive haloes at higher frequencies. Our results are in
excellent agreement with previous findings at radio and multi-frequency
surveys. However, comparison with SKADS simulation suggests that the halo mass
for different populations used in the simulation is systematically lower. This
work quantifies the spatial distribution of extragalactic compact objects in
EN1 field and bridges the gap between shallow and deep surveys.
