ISO-SWS spectroscopy of IC443 and the origin of the IRAS 12 and 25
micron emission from radiative supernova remnants
E. Oliva, D. Lutz, S. Drapatz, A.F.M. Moorwood
Abstract:
ISO-SWS spectral observations of the supernova remnant IC443 are
presented.
Like other radiative SNRs, this object is characterized by prominent
line-emitting filaments and relatively strong IRAS 12 and 25 micron
emission
which is commonly interpreted as thermal radiation from very small
grains
stochastically heated by collisions with the hot plasma behind the shock
front.
This interpretation is challenged by the data presented in this Letter
which
indicate that most of the 12 and 25 micron IRAS flux is accounted for by
ionized line emission (mainly [NeII] and [FeII]). This result also seems
to
hold for other radiative SNRs. We also discuss the possible
contribution of
H_2 lines to the IRAS 12 micron flux from the southern rim of IC443 and
briefly analyze the element abundances derived from the observed ionic
lines.
Keywords: ISM: individual objects: IC443 -- ISM:
supernova remnants -- Infrared: ISM: lines and bands
Status: A&A accepted
Address: mailto:
oliva@arcetri.astro.it
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