0120230

We propose a 200 ks INTEGRAL observation of the ultraluminous infrared galaxy (ULIG) Mrk 273. Due to the penetrating power of gamma rays INTEGRAL observations can determine whether the luminous infrared emission in Mrk 273 originates from a buried AGN with important implications for theories of galaxy evolution and the relationship between quasars disturbed galaxies and normal galaxies. the INTEGRAL results will also be important for determining the contribution of infrared luminous glaxies to the soft X-ray and gamma-ray background. [truncated! Please see actual data for full text]