Spitzer reobservation of a superluminal jet from the supernova remnant Cassiopeia A

Details Spitzer reobservation of a superluminal jet from the supernova remnant Cassiopeia A Spitzer reobservation of a superluminal jet from the supernova remnant Cassiopeia A

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop..233k&link_type=abstract

Spitzer Proposal ID #233

Astronomy and Astrophysics

Astrophysics

Scientific paper

We request 6.75 hours of Spitzer Director's Discretionary Time to perform MIPS observations of a remarkable moving structure emanating from the type II supernova remnant (SNR), Cassiopeia A. The structure was serendipitously discovered during MIPS 24 microns early release observations. A repeat observation obtained one year later under Director's Discretionary Time showed large motions, of order 10 to 20 arcsec, with a systematic trend for the motions to be to outward from the SNR. Four epochs of deep K-band images towards the northern lobe of this structure also reveal strong time variations and proper motions. Assuming the standard distance to the supernova remnant, 3.4kpc, the observed tangential velocities are at luminal to superluminal speed. They are presumably associated with central activity in the SNR such as a relativistic jet. If so, they may have a profound impact on our understanding of the astrophysics in supernovae. For example, relativistic jets in core collapse supernovae are considered as the most likely origin of gamma ray bursts.

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