A Scenario for a Baryonic Dark Halo
F. DePaolis, G. Ingrosso, Ph. Jetzer, M. Roncadelli
Abstract
The recent observations of microlensing events in the LMC by the MACHO and EROS collaborations suggest that an important fraction of the galactic halo is in the form of Massive Halo Objects (MHO) of about 0.1 M. Here, we argue that the galactic halo is mainly baryonic and that besides MHO also H2 molecular clouds may significantly contribute to it. We propose a scenario in which dark clusters of MHO and/or H2 molecular clouds form in the halo at galactocentric distances larger than ~ 10-20 kpc, since there we expect less collisions among proto globular cluster clouds and a smaller UV radiation flux. Cosmic ray protons may induce a significant gamma-ray flux in H2 molecular clouds. Our calculation gives an upper bound to this flux which is below present detectability.
Create a lesson
Related papers
On binary pulsars and the force of gravity
Davor Palle
Tidal torques. A critical review of some techniques
Michael Efroimsky, James G. Williams
Dynamics of a Spherical Accretion Shock with Neutrino Heating and Alpha-Particle Recombination
Rodrigo Fernández, Christopher Thompson
Asymptotically FRW black holes
J. T. Firouzjaee, Reza Mansouri
Reaction of Accretion Disks to Abrupt Mass Loss During Binary Black Hole Merger
Sean M. O'Neill, M. Coleman Miller, Tamara Bogdanovic et al.
A Gamma-Ray Burst/Pulsar for Cosmic-Ray Positrons with a Dark Matter-like Spectrum
Kunihito Ioka