A Large-scale Survey of the Galactic Center at 24 microns

Details A Large-scale Survey of the Galactic Center at 24 microns A Large-scale Survey of the Galactic Center at 24 microns

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20414y&link_type=abstract

Spitzer Proposal ID #20414

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Scientific paper

We request 18 hours of Spitzer time to make a large-scale (2x8 degrees) map of the Galactic Center Region at 24micron. This map will provide substantial gains in resolution and sensitivity over previous infrared data (IRAS, MSX, and ISO). Over most of the area (> 90%) we expect to achieve a 4-sigma point source detection limit of 1mJy. It is impossible to map this region to this depth in any other way. Given the unique advantages of the Galactic Center region for studying the phenomena in galaxy nuclei generally, it is inconceivable that the Spitzer}mission would be allowed to end without obtaining these data. They will become a part of the core legacy of the mission. We will use these measurements to take advantage of the unique physical resolution in the Galactic Center to compare with the behavior of the central regions of external galaxies. This comparison will include structures in the Galactic Center that have never been detected in other galaxies, but presumably are representative of what happens within them. Examples include the nonthermal filaments and the Galactic Center Lobe in the radio. The first implies that magnetic fields play a large role in shaping and controlling the interstellar medium, and the second appears to be a region of massive outflow. We will also determine an a more accurate estimate of dust temperature throughout this region and investigate its relationship with respect to the high neutral gas temperature found in this region. We will also study the clusters of massive stars and use the new data to identify additional examples. These studies will draw on the unique and large database available for this region in the radio and X-ray, much of which has been acquired by the PI working with various collaborators.

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