  Axion like particles (ALPs) are fundamental pseudo scalar particles with
properties similar to Axions which are a well-known extension of the standard
model to solve the strong CP problem in Quantum Chromodynamics. ALPs can
oscillate into photons and vice versa in the presence of an external tranversal
magnetic field. This oscillation of photon and ALPs could have important
implications for astronomical observations, i.e. a characteristic energy
dependent attenuation in Gamma ray spectra for astrophysical sources. Here we
have revisited the opportunity to search Photon-ALPs coupling in the
disappearance channel. We use eight years of Fermi Pass 8 data of a selection
of promising galactic Gamma-ray source candidates and study the modulation in
the spectra in accordance with Photon-ALPs mixing and estimate best fit values
of the parameters i.e. Photon-ALPs coupling constant$ (g_{\alpha\gamma\gamma}
)$ and ALPs mass($m_{\alpha} $). For the magnetic field we use large scale
galactic magnetic field models based on Faraday rotation measurements and we
have also studied the survival probability of photons in the Galactic plane.
