Dr
Ilias Cholis
(SISSA Trieste)
30/06/2011 14:00
Recently published $\gamma$-ray spectral data from the Fermi Collaboration
have provided the possibility to study the diffuse $\gamma$-ray sky at medium and
high latitudes ($\mid b \mid > 10^{\circ}$) and energies of 1-100 GeV with unprecedented accuracy.
This provides us the chance of probing and constraining models of annihilating
and decaying Dark Matter, as well as studying and...
Dr
Pierrick Martin
(IPAG Grenoble)
30/06/2011 14:20
Cosmic-rays with energies up to the PeV are very likely related to stellar phenomena. As they propagate away from their sources, cosmic rays illuminate the various components of the interstellar medium and give rise to emissions in the radio and gamma-ray bands. The resulting galaxy‐wide radiation can provide insights into the physics of cosmic‐ray acceleration and transport. The recent...
Dr
Timur Delahaye
(IFT-Madrid)
30/06/2011 14:40
The Galactic gamma-ray diffuse emission is currently observed in the GeV-TeV energy range with unprecedented accuracy by the Fermi satellite. Understanding this component is crucial as it provides a background to many different signals such as extragalactic sources or annihilating dark matter. It is timely to reinvestigate how it is calculated and to assess the various uncertainties which are...
Dr
Jean-Christophe David
(CEA)
30/06/2011 16:40
Spallation reactions play a role in the production of stable and radioactive isotopes in meteorites by galactic cosmic ray (GCR) particles. For several decades cosmogenic nuclide production rates have been measured in different types of meteorites and calculation models have been improved. The main microscopic ingredients of these models are: i) the particle fluxes responsible of the nuclide...
Dr
Renzo Capelli
(MPE Garching)
30/06/2011 17:00
The X-ray reflection nebulae (XRN) in the Galactic Centre (GC) region have been proposed to be the smoking gun of a past low AGN activity of Sgr A*, which is suspected to have undergone a flare about 10^4 times brighter than the brightest flare ever measured, this high state happening some hundred years ago. This enhanced X-ray activity must have left a trace in the diffuse emission permeating...
Dr
Estelle Bayet
(Oxford University)
30/06/2011 17:20
The presence of cosmic rays in regions where stars are forming actually dramatically changes the gas and grain chemistry as compared to environments where photons less energetic such as FUV and UV photons usually dominate. In my talk, I will review first the main differences existing between these two illumination mechanisms of the interstellar matter. I will then present their respective...
Dr
Marco Padovani
(IEEC Barcelona)
30/06/2011 17:40
We explore the possibility that a low-energy component of cosmic rays, not directly measurable from the Earth, can account for the discrepancy between the ionisation rate measured in diffuse and dense interstellar clouds. Starting from different extrapolations at low energies of the demodulated cosmic-ray proton and electron spectra, we computed the propagated spectra in molecular clouds in...