Mathematics – Logic
Scientific paper
May 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30318f&link_type=abstract
Spitzer Proposal ID #30318
Mathematics
Logic
Scientific paper
The old concept of ISM-free elliptical galaxies was discarded when roughly half of early-type galaxies were detected at 60 um by IRAS. Nonetheless, little is known to date on the nature of the warm ISM in this class of galaxies, since "normal" elliptical galaxies were not often observed in space missions since IRAS. Questions such as: Where is the dust? How does its temperature vary within a galaxy and among galaxies? How is the presence of dust related to AGN activity? And, especially, what are the probable origins, reservoirs, and life cycles of the dust in elliptical galaxies? Early Spitzer observations have found tantalizing examples where the dust is organized into features (arms, rings, disks) reminiscent of disks of spiral galaxies, which could have profound implications for understanding the origin of the Hubble morphological sequence. We propose to obtain moderately deep imaging with Spitzer from 3.6 to 160um of a sample of galaxies that is well studied optically (with HST imaging) in order to address these questions. The outcome of the project will be a broad picture of the origin and fate of the dust and its properties (mass, temperature, size distribution, PAH content) as a function of location within the galaxies. These data will also make a large and lasting contribution to the legacy of archival data from the Great Observatories on the global properties of nearby, normal galaxies.
Faber Sandra
Fazio Giovanni
Forman William
Jones Christine
Lauer Tod
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