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Diffuse Gamma-rays from Star Forming Galaxies

Diffuse Gamma-rays from Star Forming Galaxies. Tim Paglione York College, CUNY Boston GLAST Workshop, June 21, 2007. Milky Way -rays. Hunter et al. 1997. Gamma -rays from Normal Galaxies. “pion bump”. A.k.a. “foreground contamination”

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Diffuse 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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