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Title:
Scattered-Light Echoes from the Historical Galactic Supernovae Cassiopeia A and Tycho (SN 1572)
Authors:
Rest, A.; Welch, D. L.; Suntzeff, N. B.; Oaster, L.; Lanning, H.; Olsen, K.; Smith, R. C.; Becker, A. C.; Bergmann, M.; Challis, P.; Clocchiatti, A.; Cook, K. H.; Damke, G.; Garg, A.; Huber, M. E.; Matheson, T.; Minniti, D.; Prieto, J. L.; Wood-Vasey, W. M.
Affiliation:
AA(Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory (CTIO/NOAO), Colina El Pino s/n, La Serena, Chile.; Department of Physics, Harvard University, 17 Oxford Street, Cambridge, MA 02138.; Goldberg Fellow.), AB(Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada.), AC(Department of Physics, Texas A&M University, College Station, TX 77843-4242.), AD(Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada.), AE(National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719-4933.; Deceased 2007 December 20.), AF(National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719-4933.), AG(Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory (CTIO/NOAO), Colina El Pino s/n, La Serena, Chile.), AH(Department of Astronomy, University of Washington, Box 351580, Seattle, WA 98195.), AI(Gemini Observatory, Casilla 603, La Serena, Chile.), AJ(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.), AK(Department of Astronomy, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile.), AL(Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550.), AM(Cerro Tololo Inter-American Observatory, National Optical Astronomy Observatory (CTIO/NOAO), Colina El Pino s/n, La Serena, Chile.), AN(Department of Physics, Harvard University, 17 Oxford Street, Cambridge, MA 02138.), AO(Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, CA 94550.; Johns Hopkins University, Baltimore, MD 21218.), AP(National Optical Astronomy Observatory, 950 North Cherry Avenue, Tucson, AZ 85719-4933.), AQ(Department of Astronomy, Pontificia Universidad Católica de Chile, Casilla 306, Santiago 22, Chile.), AR(Department of Astronomy, Ohio State University, 140 West 18th Avenue, Columbus, OH 43210-1173.), AS(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138.)
Publication:
The Astrophysical Journal, Volume 681, Issue 2, pp. L81-L84. (ApJL Homepage)
Publication Date:
07/2008
Origin:
UCP
ApJ Keywords:
ISM: Individual: Name: Cassiopeia A, ISM: individual (Tycho), ISM: Supernova Remnants, Stars: Supernovae: General
DOI:
10.1086/590427
Bibliographic Code:
2008ApJ...681L..81R

Abstract

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. Ongoing 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.
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