Other
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009eimw.confe..60s&link_type=abstract
"The Evolving ISM in the Milky Way and Nearby Galaxies, The Fourth Spitzer Science Center Conference, Proceedings of the confere
Other
Galaxy: Center, Dust, Extinction, H~Ii Regions, Infrared: Ism, Ism: Lines And Bands, Ism: Molecules
Scientific paper
During Cycle 1 we used Spitzer to take high-res IRS spectra (10, 38 micron) of 38 positions in the Galactic Center (GC), all at the same Galactic longitude of and including the Arches Cluster. Our positions include the Arched Filaments, regions near the Quintuplet Cluster, the ``Bubble'' south of the Quintuplet Cluster, and the diffuse interstellar gas along the line of sight at higher Galactic latitudes. From the line fluxes measured from our GC spectra we determined that the Arched Filaments appear to be H II regions excited by the Arches Cluster and that the Bubble contains significant amounts of shocked gas, probably as a result of the winds from the massive stars of the Quintuplet Cluster (Simpson et al. 2007). Here we present our analysis of the continuum features seen in these spectra. Just as the lines show that there are substantial differences in the local environment with position in the GC (e.g., density, excitation, radiation field, amount of shocked gas), the polycyclic aromatic hydrocarbon features (PAHs) show widely varying ratios with respect to the continuum emission, being strongest for sight lines through the diffuse ISM at ~0.3 degrees distance from the Galactic plane but having small equivalent widths in the high-continuum Arched Filaments. In our Short-High spectra these features occur at 11.0, 11.2, 12.0, 12.6, 13.5, 14.2, and 16.3, 17.5 micron. Finally, a few positions in the Arched Filaments and the G0.099-0.166 radio and infrared source (probably an ultra-compact H~II region) exhibit the 15.2 micron CO2 ice feature. We discuss the correlations of these features with each other and with their local environments as previously determined from the line measurements.
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