A case for a baryonic dark halo

Abstract

Recent observations of microlensing events in the Large Magellanic Cloud by the MACHO and EROS collaborations suggest that an important fraction of the galactic halo is in the form of Massive Halo Objects (MHO) with mass $\sim 0.1M_{\odot }$. We outline a scenario in which dark clusters of MHO with mass $\sim 0.1M_{\odot }$ and $H_2$ molecular clouds form in the halo at galactocentric distances larger than $\sim$ 10 - 20 kpc, provided baryons are a major constituent of the halo. Possible signatures of our picture are discussed.

12 pages, latex, Zurich University ZU-TH 18/94 and Pavia University FNT-T 94/21

References in corpus (5)

• Possible Gravitational Microlensing of a Star in the Large Magellanic Cloud
• Stars within the Large Magellanic Cloud as Potential Lenses for Observed Microlensing Events
• On the Mass of the Dark Compact Objects in the Galactic Disk
• On the Mass of the Dark Compact Halo Objects
• Gravitational Microlensing by Dark Clusters in the Galactic Halo

Cited by in corpus (28)

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• Microlensing by Compact Objects associated to Gas Clouds
• Halo dark clusters of brown dwarfs and molecular clouds
• Constraints on Cold H_2 Clouds from Gravitational Microlensing Searches
• Does Transparent Hidden Matter Generate Optical Scintillation?
• The Cloudy Universe
• CMB as a possible new tool to study the dark baryons in galaxies
• Rotating baryonic dark halos
• Searching for Galactic hidden gas through interstellar scintillation: Results from a test with the NTT-SOFI detector
• The B-L Phase Transition: Implications for Cosmology and Neutrinos
• Gamma-ray Spectra due to Cosmic-ray Interactions with Dense Gas Clouds
• Virial clouds explaining the observed rotational asymmetry in the galactic halos
• Magnetized Filament Models for Diverging Plasma Lenses
• On the Galactic Halos Rotation by Planck Data
• On the Interaction Between Cosmic Rays and Dark Matter Molecular Clouds - II. The Age Distribution of Cosmic Ray Electrons
• Seeing the halo rotation of nearby spiral galaxies using Planck data
• Microlensing by gas filaments
• Evolution of virial clouds-I: from surface of last scattering up to the formation of population-III stars
• Cosmological nanolensing by dense gas clouds
• The Galactic Dark Matter: Predictions and Obsevations
• Virial clouds evolution from the last scattering upto the formation of first stars
• Baryonic Dark Matter: Theory and Experiment. Overview