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Title:
Infrared Echoes near the Supernova Remnant Cassiopeia A
Authors:
Krause, Oliver; Rieke, George H.; Birkmann, Stephan M.; Le Floc'h, Emeric; Gordon, Karl D.; Egami, Eiichi; Bieging, John; Hughes, John P.; Young, Erick T.; Hinz, Joannah L.; Quanz, Sascha P.; Hines, Dean C.
Affiliation:
AA(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA.), AB(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA.), AC(Max Planck Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany.), AD(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA.), AE(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA.), AF(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA.), AG(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA.), AH(Department of Physics and Astronomy, Rutgers University, 136 Frelinghuysen Road, Piscataway, NJ 08854, USA.), AI(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA.), AJ(Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA.), AK(Max Planck Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany.), AL(Space Science Institute, 4750 Walnut Street, Boulder, CO 80301, USA.)
Publication:
Science, Volume 308, Issue 5728, pp. 1604-1606 (2005).
Publication Date:
06/2005
Category:
ASTRONOMY
Origin:
SCIENCE
DOI:
10.1126/science.1112035
Bibliographic Code:
2005Sci...308.1604K

Abstract

Two images of Cassiopeia A obtained at 24 micrometers with the Spitzer Space Telescope over a 1-year time interval show moving structures outside the shell of the supernova remnant to a distance of more than 20 arc minutes. Individual features exhibit apparent motions of 10 to 20 arc seconds per year, independently confirmed by near-infrared observations. The observed tangential velocities are at roughly the speed of light. It is likely that the moving structures are infrared echoes, in which interstellar dust is heated by the explosion and by flares from the compact object near the center of the remnant.
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