Many of the baryons in the universe are dark and at least some of the dark baryons could be
in the form of compact objects. Such objects could be in various locations—galactic disks …

We consider the possibility that some of the dark matter in the halos of galaxies may be in
the form of cold, dense gas clouds. A number of observational and dynamical arguments …

We present quantitative statistical evidence for a $\gamma $-ray emission halo surrounding
the Galaxy. Maps of the emission are derived. EGRET data were analyzed in a wavelet …

We review here the main direct or indirect ways to detect the possible presence of large
amounts of cold molecular hydrogen in the outer parts of disk galaxies, an hypothesis that …

This paper is a follow-up of a previous paper about the M 82 galaxy and its halo based on
Planck observations. As in the case of M 82, a substantial north-south and east-west …

We discuss the implications of the more than 50 microlensing events seen for the
composition of the dark halo of our galaxy. Though firm conclusions are not yet possible due …

The rotation of the galactic halos is a fascinating topic which is still waiting to be addressed.
Planck data have shown the existence of a temperature asymmetry towards the halo of …

Recently, Dixon et al. have reanalyzed the EGRET data, finding a statistically significant
diffuse γ-ray emission from the Galactic halo. We show that this emission can naturally be …

The pressures of giant H II regions in six dwarf irregular galaxies are found to be a factor
of∼ 10 larger than the average pressures of the corresponding galaxy disks, obtained from …

The diffused gamma halo around our Galaxy recently discovered by EGRET could be
produced by annihilations of heavy relic neutrinos N (of fourth generation), whose mass is …