Mathematics – Logic
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30542a&link_type=abstract
Spitzer Proposal ID #30542
Mathematics
Logic
Scientific paper
Galactic-scale superwinds, driven by the collective effect of massive stars and supernovae, have been invoked as a source of heating and metallicty enrichment of both the intra-cluster and inter-galactic medium. There is abundant morphological, physical, and kinematic evidence for superwinds in nearby starburst and infrared-luminous galaxies. At high redshifts, superwinds have been seen in Lyman-break galaxies at z=2-3. M82 and NGC 253 are the nearest, brightest and best-studied starburst galaxies with multi-wavelength evidence for superwinds. GALEX UV images suggest that dust is present far out in the halos of both galaxies. Recent Spitzer IRAC imaging of M82 has revealed a spectacular, large-scale nebula along the outflow axis that is strongly emitting in the 7.7+8.6 micron PAH bands. While Spitzer IRS spectra of M82 have been taken, the superwind has never been mapped. Similarly, there exist no Spitzer IRAC images of NGC 253. We propose, therefore, to obtain an IRS spectral map of the M82 wind with the SL and LL modules of the IRS in order to measure the dust, ionized gas, and warm molecular gas in the outflow region. These spectral maps, covering the 5-38 micron range, will allow us to measure the properties (size and ionization state) of the small grains in the wind, the temperature and distribution of the warm molecular gas, and the physical parameters of the ionized gas (ionization state and density) in the superwind. In addition, we propose to obtain a deep IRAC map of NGC 253 in order to search for extended, extraplanar PAH emission. We will compare the IRAC data to existing optical, X-ray, and UV images, and use them to plan for future spectroscopic follow-up with the IRS. The total time for this proposal is 36.2 hrs.
Armus Lee
Draine Bruce
Engelbracht Charles
Heckman Tim
Hollenbach David
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