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\title{Spectral modulation of Galactic Gamma-ray sources due to photon-ALPs mixing in Galactic magnetic .
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\author{\speaker{Jhilik Majumdar}\\
        PhD student, UniHH
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        E-mail: \email{jhilik.majumdar@desy.de
}}

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\abstract{
  Axion like particles (ALPs)  are  fundamental pseudo scalar particles with properties similar to Axions that have been invoked to solve  the strong CP problem in Quantum Chromodynamics. ALPs can oscillate into photons and vice versa in the presence of  an external  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 nine years of Fermi Pass 8 data of a selection of  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 ( gαγ ) and ALPs mass ( ma ). For the magnetic field we assume large scale galactic magnetic field models based on Faraday rotation measurements.
}

\FullConference{7th Fermi Symposium 2017\\
		15-20 October 2017\\
		Garmisch-Partenkirchen, Germany}


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