Characterizing EoR foregrounds: A study of the Lockman Hole Region at
  325 MHz
  One of the key science goals for the most sensitive telescopes, both current
and upcoming, is the detection of the redshifted 21-cm signal from the Cosmic
Dawn and Epoch of Reionization. The success of detection relies on accurate
foreground modeling for their removal from data sets. This paper presents the
characterization of astrophysical sources in the Lockman Hole region. Using 325
MHz data obtained from the GMRT, a $6^\circ \times 6^\circ$ mosaiced map is
produced with an RMS reaching 50 $\mu$Jy $\mathrm{beam}^{-1}$. A source catalog
containing 6186 sources is created, and the Euclidean normalized differential
source counts have been derived from it, consistent with previous observations
as well as simulations. A detailed comparison of the source catalog is also
made with previous findings - at both lower and higher frequencies. The angular
power spectrum (APS) of the diffuse Galactic synchrotron emission is determined
for three different galactic latitudes using the Tapered Gridded Estimator. The
values of the APS lie between $\sim$1 mK$^2$ to $\sim$100 mK$^2$. Fitting a
power law of the form $A\ell^{-\beta}$ gives values of $A$ and $\beta$ varying
across the latitudes considered. This paper demonstrates, for the first time,
the variation of the power-law index for diffuse emission at very high galactic
locations. It follows the same trend that is seen at locations near the
galactic plane, thus emphasizing the need for low-frequency observations for
developing better models of the diffuse emission.
