Dust in the Wind: Mapping the Nearest Galactic Superwind with the IRS on Spitzer

Details Dust in the Wind: Mapping the Nearest Galactic Superwind with the IRS on Spitzer Dust in the Wind: Mapping the Nearest Galactic Superwind with the IRS on Spitzer

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50575a&link_type=abstract

Spitzer Proposal ID #50575

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 are found in Lyman-break galaxies at z=2-3. M82 is the nearest, brightest and best-studied starburst galaxy with multi-wavelength (UV, X-ray, Halpha, CO, etc.) evidence for a superwind. 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. Spitzer IRS maps of the base of the wind reveal a complex structure of dust, ionized gas, and molecular gas, emitting strongly in PAH features and H2 lines. However, most of the wind and the dust halo in M82 remains unobserved with the IRS. Here, we propose to obtain IRS maps of the dust in the wind at larger radii, outside the X-ray/UV ionization cone, and in the outer parts of the wind. The IRS maps proposed here will triple the wind area mapped with the IRS above the plane, and reach out more than a factor of two in radius. M82 provides a unique opportunity to study a superwind in unprecedented detail. When combined with the existing maps, the data proposed here will provide us with the most complete physical picture of the interaction of a dusty wind with a galaxy halo that can be achieved with Spitzer.

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