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Exploring Gamma-rays from Star Forming Galaxies

Uncover phenomena and challenges in detecting gamma-rays from normal and starburst galaxies. Learn about interactions between cosmic rays and interstellar matter, enhanced photon and cosmic ray densities, and potential probe capabilities. Discover the promising future with GLAST advancements. Follow the journey of improved sensitivity, resolution, and pion production models. The exploration extends to high energies, probing cosmic ray diffusion and radio/IR correlations in galaxies beyond the Milky Way.

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Exploring Gamma-rays from Star Forming Galaxies

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  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.

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