A Dust Twin of Cas A: 21-micron Dust Feature and Cold Dust in the Supernova Remnant G54.1+0.3
Abstract
We present Spitzer and submm observations of a Crab-like supernova remnant, G54.1+0.3. We serendipitously discovered a dust feature peaking at 21 micron from G54.1+0.3, and the 21-micron dust is remarkably similar to that of Cas A from Rho et al. (2008). The IRS spectrum from the western shell shows the 21-micron dust feature and strong [Ar II] and weak [Ne II], [S III] and [Si II] lines. Strong correlation between 21-micron dust and Ar ejecta has been observed in Cas A. The dust coincides with the ejecta emission, suggesting that dust has been formed in ejecta. We also present detection of cold dust from G54.1+0.3 using SHARCII (at 350 micron) and LABOCA (at 870 micron). Archival Herschel images confirmed the presence of cold dust. We present spectral fitting of SED using continuous distributions of ellipsoidal (CDE) grain models and find that silica (SiO2) is mainly responsible for the 21-micron feature. We will discuss dust properties and inferred dust mass from G54.1+0.3 using the SED from 5 to 870 micron including Herschel data and implication of supernova-dust
production in the early Universe.- Publication:
-
American Astronomical Society Meeting Abstracts #220
- Pub Date:
- May 2012
- Bibcode:
- 2012AAS...22043101R