Highly clumpy structure of the thermal composite supernova remnant 3C 391 unveiled by Chandra |
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| Institution: | 1. Department of Astronomy, Nanjing University, 22 Hankou Road, Nanjing, Jiangsu 210093, PR China;2. Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, USA;3. Department of Astronomy, B619E-LGRT, University of Massachusetts, Amherst, MA 01003, USA;1. Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS-70, Cambridge, MA 02138, USA;2. Jansky Fellow, National Radio Astronomy Observatory, and Harvard-Smithsonian Center for Astrophysics, 60 Garden Street MS-70, Cambridge, MA 02138, USA |
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| Abstract: | The nature of the internal thermal X-ray emission seen in “thermal composite” supernova remnants is still uncertain. Chandra observation of the 3C391 shows a southeast–northwest elongated morphology and unveils a highly clumpy structure of the remnant. Detailed spatially resolved spectral analysis for the small-scale features reveals normal metal abundance and uniform temperature for the interior gas. The properties of the hot gas comparatively favor the cloudlet evaporation model as a main mechanism for the “thermal composite” X-ray appearance, though radiative rim and thermal conduction may also be effective. A faint protrusion is found in Si and S lines out of the southwest radio border. |
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