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Observations of Molecular Hydrogen in Interacting Supernova
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hewitt, John W. Rho, Jeonghee Andersen, Morten Sparre Reach, William T. With |
| Copyright Year | 2009 |
| Abstract | With Spitzer IRS we have obtained sensitive low-resolution spectroscopy from 5 to 35μm for six supernova remnants (SNRs) that show evidence of shocked molecular gas: Kes 69, 3C 396, Kes 17, G346.6-0.2, G348.5-0.0 and G349.7+0.2. Bright, pure-rotational lines of molecular hydrogen are detected at the shock front in all remnants, indicative of radiative cooling from shocks interacting with dense clouds. We find the excitation of H2 S(0)-S(7) lines in these SNRs requires two non-dissociative shock components: a slow, 10 km s Cshock through clumps of density 10 cm, and a faster, 40–70 km s Cshock through a medium of density 10 cm The ortho-to-para ratio for H 2 in the warm shocked gas is typically found to be much less than the LTE value, suggesting that these SNRs are propagating into cold quiescent clouds. Additionally a total of 13 atomic fine-structure transitions of Ar, Ar, Fe, Ne, Ne, S, and Si are detected. The ionic emitting regions are spatially segregated from the molecular emitting regions within the IRS slits. The presence of ionic lines with high appearance potential requires the presence of much faster, dissociative shocks through a lower density medium. The IRS slits are sufficiently wide to include regions outside the SNR which permits emission from diffuse gas around the remnants to be separated from the shocked emission. We find the diffuse H2 gas projected outside the SNR is excited to a temperature of 100–300 K with a warm gas fraction of 0.5 to 15 percent along the line of sight. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/0901.1622v1.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Aortic Valve Insufficiency Color Compaq LTE Computer cooling Cool - action Deuterium Dietary Iron Diffuse reflection Dissociative disorder Excitation Field electron emission Gastric Stump H2 Database Engine Histamine H2 Antagonists Hydrogen Interaction Ionic Iron License Norepinephrine Numerous Projections and Predictions RLN2 gene Seizures Shell Shock Shock Signal-to-noise ratio Velocity (software development) brightness |
| Content Type | Text |
| Resource Type | Article |
