About
TeV blazars dominate the extragalactic gamma-ray sky and highly energetic pair beams arising from such blazar jets underproduce gamma rays in the GeV band while inverse-Compton scattering off the cosmic microwave background. Recent Fermi-LAT isotropic gamma-ray background measurements suggest that space plasma instabilities can play a crucial role in alleviating this GeV-TeV tension by transferring energy from the active galactic nucleus into the intergalactic medium. A direct consequence of such instability losses is the modification of thermal history and suppression of power at late times, potentially holding a clue towards resolving the small-scale crisis in cosmology. We show that the observation of dwarf galaxies and Lyman-alpha measurements can narrow down the mass range for light axion-like particles in a blazar-heated universe..
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The talk
Credits and licence
- Institution
- CERN
- Department
- Eucapt Conferences
- Speaker
- Oindrila Ghosh
- Year
- 2023
- Language
- English
- Subjects
- Astronomy and space
- Source
- CERN
- Licence
- CERN, as CERN states it. CERN's terms
- Attribution
- © CERN. CERN provides its audiovisual media free of charge for educational and informational use, credited to CERN; this lecture is shown in CERN's own player.
- Who can watch
- CERN gives no rating. Invisible Network shows it to Tweens profiles and older, judged from what the source says about it. How courses are placed