Physics
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30383w&link_type=abstract
Spitzer Proposal ID #30383
Physics
Scientific paper
Supernova SNRs (SNRs) play a significant role in dust production in the interstellar medium (ISM). Dust, in turn, is an important factor in cooling the hot plasma in SNRs. To investigate dust properties in SNRs, we used IRAC and MIPS images of 6 SNRs in the Large Magellanic Cloud (LMC), and found them to be line-dominated, with little evidence for continuum emission. This is surprising, as we expect significant continuum emission from hot dust. Its absence would raise questions about previous studies with dust properties inferred from broad-band IR emission, and would also raise the issue of whether dust is actually destroyed or persists in cold clumps. We propose to spectrally map 3 of these LMC SNRs and their surroundings. The small angular size of LMC SNRs allows complete coverage of each SNR (not possible for Galactic SNRs). Each of our selected SNRs is in a different environment: N49 interacts with a molecular cloud; N63A is embedded in an HII region; and N11L is on the edge of an HII complex. We will use the background-subtracted, spatially-mapped spectra to: (a) search for continuum emission from hot dust, (b) quantify the flux contribution from line emission to place upper limits on continuum flux, (c) compare emission from the SNR to its environment, (d) establish upper limits for PAH bands, (e) use diagnostic lines to infer physical properties in SNR regions, and (f) model dust and line emission from SNRs for comparison with these spectra. The results will show whether continuum emission is significant in any region of each SNR, and if so, how that emission is distributed spatially over the SNR. If we cannot detect continuum emission in the SNRs, our examination of the surroundings will allow us to establish whether dust is present in the environment, and perhaps destroyed in the SNRs. Or, if we can detect and quantify continuum contributions in these SNRs, we will be able to use dust models to describe such features as the mass, grain distribution, and temperatures of dust.
Chu Y.-H. Y.-H.
Ferland Gary
Gruendl Robert
Williams Rosa
No associations
LandOfFree
IRS Mapping of Three LMC Supernova Remnants and Their Surroundings 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 IRS Mapping of Three LMC Supernova Remnants and Their Surroundings, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and IRS Mapping of Three LMC Supernova Remnants and Their Surroundings will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-933988