1 Probing MHD Shocks with high-J CO observations: W28F SOFIA Observations 1.W28 is a mature supernova remnant (>2x10 4 yr old) located in the Inner Galaxy.

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Presentation transcript:

1 Probing MHD Shocks with high-J CO observations: W28F SOFIA Observations 1.W28 is a mature supernova remnant (>2x10 4 yr old) located in the Inner Galaxy (G6.4) 2.Shocked CO gas interacting molecular clouds 3.Magnetic field: 2mG 4.High energy (TeV) γ-ray emission from acceleration of hardronic particles. Observations APEX observations 13CO (3-2), CO (3-2), (4-3), (6-5) SOFIA observations: CO (11-10) data at 1267 GHz were taken during German deployment flight (Sep 1, 2011) Gusdorf, et al.

2 CO line profiles of W28: CO (11-10) profile differs from other low J CO lines. Vs (shock velocity): 20 to 25 km/s Density of 10 4 to 10 5 cm -3 CO spectra profiles

3 Implication from Shock Model C-shock (blue) and warm CO layer model (green) can produce the observed CO data. The shock model requires cosmic ray ionization rate of ( ) x s -1 Data show that radiation effect is important.