A multispectral analysis of the northeastern shell of IC 443
  We have carried out optical observations of the north-eastern part of the
supernova remnant IC 443 using the CFHT imaging spectrograph SITELLE. The
observations consist of three multispectral cubes covering an 11$^{\prime}$
$\times$11$^{\prime}$ area allowing the investigation of both the spatial and
spectral variation of 9 emission lines : [OII] $\lambda\lambda$3726+3729,
[OIII] $\lambda\lambda$4959,5007, H$\beta$, H$\alpha$, [NII]
$\lambda\lambda$6548,6583 and [SII] $\lambda\lambda$6716,6731. Extinction
measurement from the H$\alpha$ / H$\beta$ ratio shows significant variation
across the observed region with E(B-V) = 0.8-1.1. Electron density measurements
using [SII] lines indicate densities ranging from 100 up to 2500 cm$^{-3}$.
Models computed with the shock modelling code MAPPINGS are presented and
compared with the observations. A combination of complete shock model and
truncated ones are required in order to explain the observed spectrum. The
shock velocities found in IC 443 are between 20 and 150 km/s with 75 km/s being
the most prominent velocity. The pre-shock number density varies from 20 to 60
cm$^{-3}$. A single set of abundances close to solar values combined with
varying shock parameters (shock velocity, pre-shock density and shock age) are
sufficient to explain to great variation of lines intensities observed in IC
443. Despite the relatively modest spectral resolution of the data (R$\sim
1500$ at H$\alpha$), we clearly separate the red and blue velocity components
of the expanding nebula, which show significant morphological differences.
