Display Settings:


Send to:

Choose Destination
See comment in PubMed Commons below
Science. 2005 Jun 10;308(5728):1604-6.

Infrared echoes near the supernova remnant Cassiopeia A.

Author information

  • 1Steward Observatory, University of Arizona, 933 North Cherry Avenue, Tucson, AZ 85721, USA. krause@as.arizona.edu


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.

Free full text
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Icon for HighWire
    Loading ...
    Write to the Help Desk