Dust Mass Associated with the Supernova Remnant IC 443 When Emission Meets Extinction

Abstract

The dust mass of the well-known supernova remnant IC 443 is estimated from both the infrared emission and the visual extinction. With photometry to the images taken by Spitzer, WISE, IRAS, AKARI, and Planck, the spectral energy distribution (SED) of the dust is obtained after subtracting synchrotron radiation and considering the spectral line emission. The dust mass is derived by fitting the SED with a two-component model, which results in a warm component with a temperature of ∼53 K and mass of 0.1 M ⊙ and a cold component with a temperature of ∼17 K and mass of 46 M ⊙ . On the other hand, the dust mass is derived to be ∼66 M ⊙ from the visual extinction of IC 443, which is identified from the 3D Bayestar extinction map and its coincidence with the infrared emission morphology. The dust mass derived from the infrared emission is in rough agreement with that derived from extinction. However, the two can be adjusted to be more consistent by using a different dust opacity or by considering optically thick radiation. In addition, the distribution of dust temperature and mass is analyzed by fitting the SED pixel-by-pixel.