MHOs and molecular clouds in dark galactic halos

We outline a scenario in which dark clusters of Massive Halo Objects(MHOs) and molecular clouds form in the halo at galactocentric distances larger than 10–20 kpc, provided baryons are a major constituent of the halo. Possible signatures of the presence of molecular clouds in our galaxy are discussed. We also discuss how molecular clouds as well as MHOs can be observed directly in the nearby M31 galaxy