Interaction between the X-ray gas and radio gas in the galaxy cluster PKS 0745-191 |
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| Institution: | 1. Key Laboratory of Space Astronomy and Technology, National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100012, China;2. School of Astronomy and Space Sciences, University of Chinese Academy of Sciences, 19A Yuquan Road, Beijing 100049, China;1. Department of Allergy and Immunology, Royal Children''s Hospital, Melbourne, Australia;2. Department of Paediatrics, University of Melbourne, Melbourne, Australia;3. Allergy and Immune Disorders, Murdoch Childrens Research Institute, Melbourne, Australia;4. Environmental and Genetic Epidemiology, Murdoch Childrens Research Institute, Melbourne, Australia;5. Clinical Epidemiology and Biostatistics Unit, Murdoch Childrens Research Institute, Melbourne, Australia;6. Department of Pediatrics, University of North Carolina, Chapel Hill, NC;1. Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, Xinjiang, People''s Republic of China;2. School of Astronomy and Space Science, Nanjing University, Nanjing 210023, Jiangsu, People''s Republic of China;3. Xinjiang Key Laboratory of Radio Astrophysics, Urumqi 830011, Xinjiang, People''s Republic of China;4. Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210023, Jiangsu, People''s Republic of China;5. Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023, Jiangsu, People''s Republic of China;6. Department of Physics, Nanjing University, Nanjing 210093, Jiangsu, People''s Republic of China;7. Joint Center for Particle, Nuclear Physics and Cosmology, Nanjing University, Nanjing 210093, Jiangsu, People''s Republic of China;8. Nanjing Institute of Proton Source Technology, Nanjing 210046, Jiangsu, People''s Republic of China;9. Department of Physics, Anhui Normal University, Wuhu 241000, Anhui, People''s Republic of China;1. Department of Geography and Environment, University of Western Ontario, London, ON N6A 5C2, Canada;2. Department of Physics and Astronomy, University of Western Ontario, London, ON N6A 3K7, Canada;3. The Institute for Earth and Space Exploration, University of Western Ontario, London, ON N6A 3K7, Canada;4. Department of Physics and Astronomy, University of Louisville, Louisville, KY 40292, United States |
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| Abstract: | By analyzing the Chandra data of the central region of the galaxy cluster PKS 0745-191, the properties of a patch of bright X-ray gas distributed along the radio structure in the west of the central galaxy are investigated. This gas is found to be cooler and denser than the ambient gas. According to the calculation based on radio observations, the pressure gradient of the radio gas in the west is greater than that in the east. It means that there is interaction between that patch of cool X-ray gas and the radio gas. The cool gas is either formed by outer cool gas supported and disturbed by the radio gas, or is brought out from the central galaxy by radio buoyant bubbles. Assuming that the gas is in pressure-gravity balance, the volume filling factor of the X-ray gas in the central region is calculated to be b = 0.69 ± 0.28, and the properties of the relativistic particles in the radio gas, as well as the expansion effect of the radio gas on the cooling flow, are discussed. |
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