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Infrared Studies of Molecular Shocks in the Supernova Remnant HB 21 : II . Thermal Admixture of Shocked H 2 Gas in the South
| Content Provider | Semantic Scholar |
|---|---|
| Author | Shinn, Jong-Ho Koo, Bon-Chul Moon, D. E. |
| Copyright Year | 2008 |
| Abstract | We present nearand mid-infrared observations on the shock-cloud interaction region in the southern part of the supernova remnant HB 21, performed with the InfraRed Camera (IRC) aboard AKARI satellite and the Wide InfraRed Camera (WIRC) at the Palomar 5 m telescope. The IRC 4 μm (N4), 7 μm (S7), and 11 μm (S11) band images and the WIRC H2 υ = 1 → 0 S(1) 2.12 μm image show similar diffuse features, around a shocked CO cloud. We analyzed the emission through comparison with the H2 line emission of several shock models. The IRC colors are well explained by the thermal admixture model of H2 gas—whose infinitesimal H2 Preprint submitted to Elsevier 22 September 2009 column density has a power-law relation with the temperature T , dN ∼ TdT— with n(H2) ∼ 3.9 × 10 4 cm−3, b ∼ 4.2, and N(H2 ;T > 100K) ∼ 2.8 × 10 21 cm−2. We interpreted these parameters with several different pictures of the shock-cloud interactions—multiple planar C-shocks, bow shocks, and shocked clumps—and discuss their weaknesses and strengths. The observed H2 υ = 1 → 0 S(1) intensity is four times greater than the prediction from the power-law admixture model, the same tendency as found in the northern part of HB 21 (Paper I). We also explored the limitation of the thermal admixture model with respect to the derived model parameters. Additionally, we investigated the CO-to-H2 abundance of the shocked gas in HB 21 and IC 443. It ranges (2.3 − 17.6) × 10−4, 2 − 35 times greater than typical in molecular clouds. We suggested several reasons for this. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://arxiv.org/pdf/0908.4311v1.pdf |
| Alternate Webpage(s) | http://arxiv.org/pdf/0908.4311v2.pdf |
| Alternate Webpage(s) | http://arxiv.org/pdf/0812.1855v1.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Color Deuterium Histamine H2 Antagonists Interaction Internet Relay Chat RLN2 gene Remnant Shock Spectroscopy, Near-Infrared Toshiba Satellite Weakness Wipro Supernova insulin-responsive compartment |
| Content Type | Text |
| Resource Type | Article |
