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Probing MHD Shocks with high-J CO observations: W28F SOFIA Observations

Probing MHD Shocks with high-J CO observations: W28F SOFIA Observations. W28 is a mature supernova remnant (>2x10 4 yr old) located in the Inner Galaxy (G6.4) Shocked CO gas interacting molecular clouds Magnetic field: 2mG

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Probing MHD Shocks with high-J CO observations: W28F SOFIA Observations

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  1. Probing MHD Shocks with high-J CO observations: W28FSOFIA Observations • W28 is a mature supernova remnant (>2x104 yr old) located in the Inner Galaxy (G6.4) • Shocked CO gas interacting molecular clouds • Magnetic field: 2mG • 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 spectra profiles • 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 104 to 105 cm-3

  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 (0.5-3.4) x 10-16 s-1 • Data show that radiation effect is important.

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