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An XMM-Newton study of the mixed-morphology supernova remnant W28

Published online by Cambridge University Press:  29 January 2014

Ping Zhou ,
Samar Safi-Harb ,
Yang Chen  and
Xiao Zhang
Ping Zhou
Affiliation:
Department of Astronomy, Nanjing University, Nanjing 210093, China email: [email protected] Department of Physics and Astronomy, University of Manitoba, Winnpeg R3T 2N2, Canada
Samar Safi-Harb
Affiliation:
Department of Physics and Astronomy, University of Manitoba, Winnpeg R3T 2N2, Canada Canada Research Chair
Yang Chen
Affiliation:
Department of Astronomy, Nanjing University, Nanjing 210093, China email: [email protected] Key Laboratory of Modern Astronomy and Astrophysics, Nanjing University, Ministry of Education, China
Xiao Zhang
Affiliation:
Department of Astronomy, Nanjing University, Nanjing 210093, China email: [email protected]
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Abstract

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We perform an XMM-Newton study of the mixed-morphology supernova remnant (MMSNR) W28. The X-ray spectrum arising from the northeastern shell consists of a thermal component plus a non-thermal power-law component with a hard photon index (~1.5). Non-thermal bremsstrahlung is the most favourible origin of the hard X-ray emission. The gas in the SNR interior is centrally peaked and best described by a two-temperature thermal model. We found a non-uniform absorption column density and temperature profile for the central gas, indicating that the remnant is evolving in a non-uniform environment with denser material in the east. We argue that the cloudlet evaporation is an indispensable process to explain both the spectral properties and the clumpiness in the X-ray emission.

Keywords

Supernova remnantsISM: individual (G6.4–0.1 = W28)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S296: Supernova Environmental Impacts , January 2013 , pp. 360 - 361
Copyright
Copyright © International Astronomical Union 2014 

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