Other
Scientific paper
Apr 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009sptz.prop60101a&link_type=abstract
Spitzer Proposal ID #60101
Other
Scientific paper
Spitzer's serendipitous discovery of light echoes from the supernovae (SN) that gave birth to the Cas A supernova remnant (SNR) shows that we have to opportunity to re-observe historical Galactic supernovae. Optical spectra of these echoes have shown that the Cas A SN was of Type IIb. Similarly, Tycho's SN has been spectroscopically established to be of Type Ia. The Cas A light echoes are the only ones seen by Spitzer to date. However, this is because existing observations of other young galactic SNRs have only included a single epoch of observations (insufficient to reveal the highly transitory echoes), and have only covered small fields in the immediate vicinity of the SNRs. We proposed to obtain wide field (>0.5 degree) observations of the 7 youngest Galactic SNe, having ages up to ~1000 yr. Where available, prior epoch observations will allow definitive identification of light echoes. If the Cas A echoes are representative, we can also identify echo candidates via their distinctive 4.5/3.6 micron colors. Variations (or lack thereof) in these colors as a function of SN age and SN type, will allow us to place constraints on the emission mechanism of the echoes (absorption and re-radiation vs. scattering). Low extinction at 3.6 and 4.5 microns, means that Spitzer can located echoes of distant SNe which may be too highly attenuated to observe at shorter wavelengths.
Arendt Richard
Dwek Eli
Rho Jeonghee
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