Computer Science
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3680b&link_type=abstract
Spitzer Proposal ID #3680
Computer Science
Scientific paper
Stellar explosions govern the interstellar dust lifecycle. In the early Universe, supernovae (SN) injected the first heavy elements into the interstellar medium (ISM). A significant fraction of ejecta was dust. Dust is destroyed today in supernova remnant's (SNR) blast waves. Our current understanding of both formation of dust in SNe and destruction of dust in blast waves is poorly understood. We propose to observe a complete sample of SNRs in Magellanic Clouds (MCs) with the Spitzer Space Telescope (SST) in order to dramatically advance our knowledge of these processes. Heavy-element ejecta have been detected in more than one third of all SNRs in MCs, mostly in X-rays. Dust within these ejecta is collisionally heated by electrons and ions, and reradiates the absorbed energy in the far-IR. We propose deep MIPS and IRAC imaging of all MC SNRs with heavy-element ejecta in order to detect and study ejecta dust. We will determine dust temperature, dust mass, and its spatial distribution within ejecta. We will also detect dust in the ISM swept by SNR blast waves. This dust is destroyed by sputtering in hot X-ray emitting plasmas. We will learn about dust destruction by measuring the dust/gas mass ratio behind blast waves through a combined IR-X-ray analysis. Sputtering preferentially destroys small dust grains, modifying the grain size distribution. This strongly affects thermal dust emission in the IRAC bands which is produced by small grains. We will learn about the destruction of small grains by observing spatial variations of IRAC band ratios behind blast waves. An unbiased survey of all SNRs in MCs is necessary for understanding of dust destruction. We propose 24 micron MIPS imaging of all MC SNRs, and 70 micron MIPS imaging of X-ray bright SNRs. The proposed MIPS and IRAC imaging of MC SNRs will provide us with unique information about ejecta dust in a large sample of SNRs and about destruction of the ISM dust.
Blair William
Borkowski Kazimierz
Ghavamian Parviz
Hendrick Sean
Long Knox
No associations
LandOfFree
Ejecta and Interstellar Dust in Magellanic Clouds Supernova Remnants does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Ejecta and Interstellar Dust in Magellanic Clouds Supernova Remnants, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ejecta and Interstellar Dust in Magellanic Clouds Supernova Remnants will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1824726