Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21832106s&link_type=abstract
American Astronomical Society, AAS Meeting #218, #321.06; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
DC314.8-5.1 is an isolated globule in the constellation of Circinus in the southern hemisphere. A 10.53 V-magnitude B9 star is illuminating a reflection nebula in the eastern part of this cloud. We surveyed this cloud using data from Spitzer IRS, IRAC and MIPS instruments. The main goals of our survey are to use mid-IR photometry along with 2MASS data to determine if this globule is a site of active star formation and to use IR spectroscopy to detect PAHs and investigate the energetics in the cloud.
Here we describe preliminary results from the investigation of PAH emissions in DC314.8-5.1. Inspection of the IRAC 8 micron image shows widespread structured PAH emission towards this cloud. We have high resolution IRS spectra of HD130079 and low resolution IRS maps of the reflection nebula. In the spectral data we detect all the major PAH emissions in the 5 20 micron region. We find that the emission in the 12 14 micron region is quenched compared to the 11.3 micron feature suggesting most of the PAHs have solo hydrogen bonds. Spatial variation of PAH emissions seems to be identical as we move from the illuminating source, HD130079, towards the interior of the cloud except in the south-southwest region, where we see a slight enhancement. This enhancement is probably due to the skin effect (i.e., an excess due to viewing angle). We will analyze the ratios of various PAH features to i) put this globule in a global context with respect to the energetics of the region, and ii) determine the ionization state of the carrier molecules to investigate the interaction of PAHs with soft UV radiation. Combining results from the spectroscopic program with the stellar census data will provide new insight into the physical and evolutionary state of this isolated globule.
Allamandola Louis J.
Boersma Christiaan
Horne David
Mayeur Paul A.
Pendleton Yvonne J.
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