Other
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21545913m&link_type=abstract
American Astronomical Society, AAS Meeting #215, #459.13; Bulletin of the American Astronomical Society, Vol. 42, p.487
Other
Scientific paper
The IR emission features between 3 and 20 microns are generally attributed to a family of large aromatic molecules in space. They are commonly referred to as "PAH features" even if the exact carriers are not yet identified. The PAH emission bands are proving to be more and more important astrophysical probes of star formation tracers and as a consequence can be used to distinguish between different types of galaxies. The different band ratios are know to vary from source to source and as a function of local galactic environment. The strength of the PAH emission bands compared to other IR components also varies, reflecting variations in dust processing and illumination conditions. From a laboratory point of view there are several competing effects that determine the band ratios. These include the charge state of the molecules as well as possible local variations of chemical make-up of the PAH family effecting the shape of the bands. Sage-SPEC provides a unique possibility to study the environmental influence on the PAH emission features. In this work we study the Sage-SPEC extended maps which cover a wide range of targets from relatively quiescent regions to the most actively star forming regions in the LMC for which spectral maps have been obtained. In the poster we present our study aiming to disentangle the dominating parameters that determined the spectrum of PAH features, by correlating the properties of the PAHs spectra and the band ratios with a variety of other tracers from Spitzer, exploring the differing conditions in the diffuse ISM and the denser regions in the LMC.
Galametz Maud
Galliano Frederic
Hony Sacha
Kemper Ciska
Madden Suzanne C.
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