RICAP-13 Roma International Conference on AstroParticle Physics

Gamma-ray emission from the SNR W44: confirmations and challenges for cosmic-ray acceleration.

22 mag 2013, 15:15

15m

Aula Giorgio Careri (first floor) (Physics Department, University "La Sapienza", Roma, Italy)

Parallel Session B

Relatore

Sig.ra Martina Cardillo (INAF-IAPS & Università di Roma Tor Vergata)

Descrizione

The SNRW44 plays a crucial role in our understanding of the Cosmic Ray origin. Recently, AGILE and Fermi-LAT data have determined, for the first time in a supernova remnant, that the gamma-ray emission from W44 can be attributed to accelerated proton/ions. We present new W44 AGILE data and compare them with the recent Fermi data, in the light of new NANTEN2 telescope CO results. Our analysis provides strong constraints for the SNR complex environment: high density (n>200 cm^-3), high magnetic field on large scales (B~10^2 microG) and a proton spectral index steeper than in other middle-aged SNRs (p=3.2). The W44 characteristics are challenging for all theoretical models.

Materiali di presentazione

Slides

Presentazione_RICAP.pdf