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The Structure of Overionized Plasma in SNR IC 443

Published online by Cambridge University Press:  29 January 2014

Bing Jiang ,
Fabrizio Bocchino ,
Marco Miceli ,
Eleonora Troja ,
Yang Chen  and
Hiroya Yamaguchi
Bing Jiang
Affiliation:
Department of Astronomy, Nanjing University, Nanjing 210093, P.R.China email: bjiang@nju.edu.cn
Fabrizio Bocchino
Affiliation:
INAF-Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
Marco Miceli
Affiliation:
INAF-Osservatorio Astronomico di Palermo, Piazza del Parlamento 1, 90134 Palermo, Italy
Eleonora Troja
Affiliation:
NASA, Goddard Space Flight Center, Greenbelt, MD 20771, USA
Yang Chen
Affiliation:
Department of Astronomy, Nanjing University, Nanjing 210093, P.R.China email: bjiang@nju.edu.cn
Hiroya Yamaguchi
Affiliation:
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
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Abstract

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During the last few years, overionized (recombining) plasmas were unexpectedly discovered in a few supernova remnants, but the origin is still unclear. In this contribution, we present a preliminary spectroscopic analysis of the X-ray emission from the north central region of IC443, one of the “recombining” remnants. An overionized NEI plasma model can reproduce well the Ly-alpha lines and the recombination edges in the spectrum. The ionization temperatures for the metals Mg, Si and S are much higher than the electron temperatures. which is a strong indication of overionization of these elements. The different spectral features of the recombining plasma are characterized on scales of a few arcmin, such as the increasing trend of the pre-cooling temperature and the ionization time from south to north, which may imply a pre-heating direction.

Keywords

ISM: individual (IC 443 (G189.1+3.0))radiation mechanisms: thermalsupernova remnantsX-rays:ISM
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S296: Supernova Environmental Impacts , January 2013 , pp. 362 - 363
Copyright
Copyright © International Astronomical Union 2014 

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