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28 March 2024
 
  » arxiv » astro-ph/0508684

 Article overview


A Light Echo Around Supernova 2003gd in Messier 74
Schuyler D. Van Dyk ; Weidong Li ; Alexei V. Filippenko ;
Date 31 Aug 2005
Subject astro-ph
AffiliationSpitzer Science Center/Caltech), Weidong Li, and Alexei V. Filippenko (UC Berkeley
AbstractWe have discovered a light echo around the Type II-plateau Supernova 2003gd in Messier 74 (NGC 628), seen in images obtained with the High Resolution Channel of the Advanced Camera for Surveys on-board the Hubble Space Telescope (HST), as part of a larger Snapshot program on the late-time emission from supernovae. A preliminary analysis of the echo suggests it is due to the SN light pulse scattered by a sheet of dust grains located about 110 pc in front of the SN, and that these grains are unlike those assumed to be in the diffuse Galactic interstellar medium. Instead, we speculate that the grain size distribution is skewed to larger radii (greater than or about 0.01 micron) or that the grains are more silicate-rich, or both factors. The echo should continue to be monitored by HST in several bands, particularly in the blue, to better constrain its origin.
Source arXiv, astro-ph/0508684
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