Comparison of Spitzer/IRAC Galactic Center Mid-IR Survey Results with X-ray and Radio Emission Due to High-Energy Processes in the Central 100 Parsecs

Details Comparison of Spitzer/IRAC Galactic Center Mid-IR Survey Results with X-ray and Radio Emission Due to High-Energy Processes in the Central 100 Parsecs Comparison of Spitzer/IRAC Galactic Center Mid-IR Survey Results with X-ray and Radio Emission Due to High-Energy Processes in the Central 100 Parsecs

Dec 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...20718107g&link_type=abstract

American Astronomical Society Meeting 207, #181.07; Bulletin of the American Astronomical Society, Vol. 37, p.1461

Astronomy and Astrophysics

Astronomy

Scientific paper

We compare the results of a small region from our 3.6 - 8.0 micron Spitzer/IRAC imaging survey of 2 x 1.5° around the Galactic Center (see Stolovy et al., this conference) with x-ray and radio emission due to high energy processes. The region we studied covers 100 x 100 parsecs, and was chosen to include a rich collection of sources, including Sgr A* and the bright Sgr A West infrared/radio source complex, the circum-nuclear ring, Sgr A East and the associated HII regions, the non-thermal radio filaments and thermal radio arches. In a 40 x 40 parsec subset of that region we make a preliminary analysis of the correlation between ˜2300 x-ray sources identified by Muno et al. (2003) and ˜20,000 infrared sources from our survey, using various spatial and brightness thresholds. We note differences between our results and previous identifications of near infrared companions to x-ray sources. We also investigate the correlation between infrared and radio emission in the large-scale structures including the thermal radio arches and non-thermal radio filaments. Tracing the relative contributions of the radio, stellar, PAH and infrared continuum emission reveals some surprising variations in the degree of correlation found in features of the same type. We set constraints on the synchrotron spectrum observed at radio and millimeter wavelengths extrapolated to 8 micron , and set limits on the mid-infrared variability of Sgr A* during and after the coordinated multi-wavelength observing campaign in September 2004.

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