Possible connection between the asymmetry of North Polar Spur and Loop I
  with Fermi Bubbles
  The origin of North Polar Spur (NPS) and Loop-I has been debated over almost
half a century and is still unresolved. Most of the confusion is caused by the
absence of any prominent counterparts of these structures in the southern
Galactic hemisphere (SGH). This has also led to doubts over the claimed
connection between the NPS and Fermi Bubbles (FBs). I show in this paper, that
such asymmetries of NPS and Loop-I in both X-rays and $\gamma$-rays can be
easily produced if the circumgalactic medium (CGM) density in the southern
hemisphere is only smaller by $\approx 20\%$ than the northern counterpart in
case of a star formation driven wind scenario. The required mechanical
luminosity, $\mathcal{L} \approx 4-5\times 10^{40} $ erg s$^{-1}$ (reduces to
$\approx 0.3$ M$_\odot$ yr$^{-1}$ including the non-thermal pressure) and the
age of the FBs, $t_{\rm age} \approx 28$ Myr, are consistent with previous
estimations in case of a star formation driven wind scenario. One of the main
reasons for the asymmetry is the projection effects at the Solar location. Such
a proposition is also consistent with the fact that the southern FB is $\approx
5^\circ$ bigger than the northern one. The results, therefore, indicate towards
a possibility for a common origin of the NPS, Loop-I and FBs from the Galactic
centre (GC). I also estimate the average sky brightness in X-ray towards the
south Galactic pole and North Galactic pole in the ROSAT-R67 band and find that
the error in average brightness is far too large to have any estimation of the
deficiency in the southern hemisphere.
