Constraining the cosmic abundance of stellar remnants with multi-TeV gamma-rays
arXiv:astro-ph/9903181 · doi:10.1086/312243
Abstract
If galactic halos contain stellar remnants, the infra-red flux from the remnant progenitors would contribute to the opacity of multi-TeV gamma-rays. The multi-TeV gamma-ray horizon is established to be at a redshift z>0.034 by the observation of the blazar Mkn501 . By requiring that the optical depth due to γγ---> e+ e- be less than one for a source at z=0.034 we limit the cosmological density of stellar remnants, Omega_rm \le (2-4) x 10^-3 h_70^-1 (h_70 is the Hubble constant in units of 70 km sec-1 Mpc-1) and thus strongly constrain stellar remnants as a cosmologically significant source of dark matter.
6 pages, Submitted to ApJ Letters
References in corpus (8)
- How Uncertain Are Solar Neutrino Predictions?
- The Spheroid Luminosity and Mass Functions From HST Star Counts
- Is Galactic Dark Matter White ?
- The LMC Microlensing Events: Evidence for a Warped and Flaring Milky Way Disk?
- Massive Compact Halo Objects Viewed from a Cosmological Perspective: Contribution to the Baryonic Mass Density of the Universe
- Evidence for Intergalactic Absorption in the TeV Gamma-Ray Spectrum of Mkn 501
- An Upper Limit on the Infrared Background Density from HEGRA data on Mkn501
- Brown Dwarfs, White Knights and Demons
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