The Spitzer Mid-Infrared Survey of the Inner 2 x 1.5 Degrees of the Galaxy

Details The Spitzer Mid-Infrared Survey of the Inner 2 x 1.5 Degrees of the Galaxy The Spitzer Mid-Infrared Survey of the Inner 2 x 1.5 Degrees of the Galaxy

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006iaujd..13e..25s&link_type=abstract

Exploiting Large Surveys for Galactic Astronomy, 26th meeting of the IAU, Joint Discussion 13, 22-23 August 2006, Prague, Czech

Astronomy and Astrophysics

Astronomy

Scientific paper

We present IRAC observations of the central 2 x 1.5 degrees (280 x 210 pc) of the Galaxy with 1-2" spatial resolution, corresponding to 0.04-0.08 pc. These data represent the highest spatial resolution and sensitivity large-scale map made to date of the GC at mid-infrared wavelengths. The IRAC data provide a census of the optically obscured stellar sources as well as a detailed map of the highly filamentary structure in the interstellar medium, much of which is dominated by PAH emission from small grains in star-forming regions. Dark clouds displaying a large variety of sizes and morphologies are imaged, many of which remain opaque at IRAC wavelengths. Different views of the GC, spanning radio through x-ray wavelengths, provide comparisons we can use to determine which objects are likely to be foreground. We discuss in particular the 10x10 arcminute area around the Sickle, the Pistol star and the Pistol nebula. The Sickle, the ionized edge of a molecular cloud, has previously been observed in thermal radio emission to have a curved appearance with a center of curvature near the Quintuplet star cluster. Our Spitzer observations at 2'' resolution reveal that the Sickle is comprised of a series of finger-like structures. We interpret these to be formed by photoevaporation of the dense molecular material by the intense UV radiation from the hot, massive stars in the Quintuplet cluster.

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