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

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

Nov 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop..231k&link_type=abstract

Spitzer Proposal ID #231

Physics

Scientific paper

We propose to use 55 min of Spitzer Director's Discretionary Time to perform MIPS and IRAC follow-up observations of a remarkable bipolar structure around the type II supernova remnant Cassiopeia A, which was serendipitously discovered during MIPS 24 micron early release observations. Two epochs of recently obtained K-band images towards the northern lobe of this structure revealed strong time variations and proper motions of up to 6" within only 4 months, which are among the fastest ever observed for an object beyond the solar system. Assuming these phenomena are physically connected to the supernova remnant at a distance of 3.4 kpc, the observed tangential velocities are at luminal or superluminal speed. In our galaxy, (super)luminal motios have so far only been observed in light echos and relativistic jets of microquasars. We propose to repeat the MIPS 24 micron scan map of Cas A in the upcoming visibility window in order to follow-up the high proper motions observed in the K-band. Contemporary images of the bright northern lobe in the four IRAC bands between 3.6 and 8 microns with a third epoch of K-band observations in early December will reveal important clues about the physical nature of the mechanism (thermal/non-thermal) of the observed infrared emission.

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