H2/PAH emissions in the shocks and UV dominated regions of the embedded young cluster NGC2316

Details H2/PAH emissions in the shocks and UV dominated regions of the embedded young cluster NGC2316 H2/PAH emissions in the shocks and UV dominated regions of the embedded young cluster NGC2316

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.8416v&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #84.16; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astronomy

Scientific paper

Observations of embedded young star clusters, still contained within their parent molecular clouds are important to understand how the UV flux and shocks caused by young stars influence the evolution of the cloud, its dispersal and subsequent termination or triggering of star formation. NGC 2316 is a young embedded star cluster containing a central HII region powered by a B3 star. The UV flux and shocks caused by this young star affect the physical conditions and the chemical composition of the surrounding cloud. We present Spitzer IRS maps of the PAH features and H2 lines in the 9 -14 µm (SL1) and 15 -18µm (LL2) bands obtained using multiple slit positions. We show the distribution and the relative variations between the various PAH features at 11.2, 12.0, 12.7, 13.5, 16.4, and 17.4 µm with distance from UV source, and with respect to the shocks. We have also mapped the line intensities at three H2 transitions: S (1) Ortho 17.0 µm, S(2) Para 12.3µm, and S(3) Ortho 9.7µm. The H2 line emission is dominant over the outer shock regions while PAH features are prominent inside. The H2 line intensities are used as diagnostics of the temperature structure and the PAH features to trace the UV field and the chemical composition of the gas and dust. We interpret the observed differences between the distributions of the PAH features in terms of the excitation, destruction and molecular structure of PAHs.
This work was performed by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration

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