Multi-Wavelength Correlation Studies Of Diffuse Emission From The Aquila
  Rift
  We present a multi-wavelength correlation study of diffuse ultraviolet
radiation using GALEX observations towards the Aquila Rift. Apart from airglow
and zodiacal emissions, we find a diffuse background of 1300 - 3700 \photu\ in
the far-ultraviolet (FUV: 1350 - 1750 \AA) band and 1300 - 2800 \photu\ in the
near-ultraviolet (NUV: 1750 - 2850 \AA) band. The observed diffuse UV emissions
are saturated with total as well as neutral hydrogen column density in the
region due to high optical depth in UV ($\tau$: 0.91-23.38). Higher values of
FUV/NUV ratio in the region, greater than the threshold value of 0.6, along
with the positive correlation between the ratio and FUV intensity are due to
excess emission in the FUV band which is absent in the NUV band. We estimated
the excess emission to be in the range $\sim$ 400 - 2700 \photu, plausibly due
to H$_2$ fluorescence, ion line emissions and two-photon continuum emissions
from the region in the FUV band, which also shows saturation in optically thick
regions with N(H$_{2}$) as well as H$\alpha$ emissions. Since N(H$_{2}$) and
H$\alpha$ emissions spread all over the region, the excess emission from the
field is composite in nature and a detailed spectroscopic analysis is needed to
disentangle the contribution from individual components.
