1 / 5

Diffuse Gamma-rays from Star Forming Galaxies

This presentation explores the origins of diffuse gamma-ray emissions from star-forming galaxies, focusing on mechanisms like pion decay and inverse Compton scattering. Highlighting the challenge of foreground contamination from cosmic rays interacting with interstellar matter, the discussion includes enhanced photon and cosmic ray densities due to supernova events and massive stars. The promise of GLAST is underscored, emphasizing its improved sensitivity and resolution for detailed studies of gamma-ray emissions, which could refine our understanding of cosmic ray diffusion and the environments within other galaxies.

linus
Télécharger la présentation

Diffuse Gamma-rays from Star Forming Galaxies

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Diffuse Gamma-rays from Star Forming Galaxies Tim Paglione York College, CUNY Boston GLAST Workshop, June 21, 2007

  2. Milky Way -rays Hunter et al. 1997 Gamma-rays from Normal Galaxies “pion bump” • A.k.a. “foreground contamination” • Interactions between cosmic rays and interstellar matter & radiation • Inverse Compton scattering • Bremsstrahlung • Neutral pion decay

  3. Gamma-rays from Starbursts • Inverse Compton scattering • Enhanced (IR) photon density from numerous clusters of young massive stars • Bremsstrahlung • Enhanced cosmic ray density from numerous supernova explosions • Neutral pion decay • Enhanced proton density in massive molecular clouds

  4. Blom et al. 1999 Gamma-rays from Starbursts • Only upper limits from EGRET • Paglione et al. 1996; Blom, Paglione & Carramiñana 1999; Cillis, Torres & Reimer 2005)

  5. Promise of GLAST • Better sensitivity & better resolution • Follows extensive surveys in IR, radio and molecular gas emission • Improved models of pion production • Extends to very high energies (CANGAROO?) • Probe X = N(H2)/ICO in other galaxies, cosmic ray diffusion (radio/IR correlation), etc.

More Related