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Scattered-Light Echoes from the Historical Galactic Supernovae Cassiopeia A and Tycho (SN 1572)

Journal Article · · Astrophysical Journal Letters, vol. 681, no. 2, July 1, 2008, L81-L84
DOI:https://doi.org/10.1086/590427· OSTI ID:945610
We report the discovery of an extensive system of scattered light echo arclets associated with the recent supernovae in the local neighborhood of the Milky Way: Tycho (SN 1572) and Cassiopeia A. Existing work suggests that the Tycho SN was a thermonuclear explosion while the Cas A supernova was a core collapse explosion. Precise classifications according to modern nomenclature require spectra of the outburst light. In the case of ancient SNe, this can only be done with spectroscopy of their light echo, where the discovery of the light echoes from the outburst light is the first step. Adjacent light echo positions suggest that Cas A and Tycho may share common scattering dust structures. If so, it is possible to measure precise distances between historical Galactic supernovae. On-going surveys that alert on the development of bright scattered-light echo features have the potential to reveal detailed spectroscopic information for many recent Galactic supernovae, both directly visible and obscured by dust in the Galactic plane.
Research Organization:
Lawrence Livermore National Laboratory (LLNL), Livermore, CA
Sponsoring Organization:
USDOE
DOE Contract Number:
W-7405-ENG-48
OSTI ID:
945610
Report Number(s):
LLNL-JRNL-403751
Journal Information:
Astrophysical Journal Letters, vol. 681, no. 2, July 1, 2008, L81-L84, Journal Name: Astrophysical Journal Letters, vol. 681, no. 2, July 1, 2008, L81-L84 Journal Issue: 2 Vol. 681
Country of Publication:
United States
Language:
English

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