The Mid/Far Infrared Diffuse Emission of the Taurus Molecular Cloud

Details The Mid/Far Infrared Diffuse Emission of the Taurus Molecular Cloud The Mid/Far Infrared Diffuse Emission of the Taurus Molecular Cloud

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.1216n&link_type=abstract

American Astronomical Society, AAS Meeting #211, #12.16; Bulletin of the American Astronomical Society, Vol. 39, p.753

Astronomy and Astrophysics

Astronomy

Scientific paper

We used Spitzer observations to quantify spatial variations of PAHs properties within the Taurus molecular cloud. Each dust component (PAHs, VSGs for Very Small Grains and BGs for Big Grains) can be related to one Spitzer channel (IRAC 8, MIPS 24 and MIPS 160 microns, respectively). A first difficulty was to obtain images of the low brightness diffuse emission across the entire cloud (e.g. Zodiacal light contamination was removed as best as possible). We validated the photometry of each image. The observations show that PAHs are present within a surface layer thinner than that penetrated by ultraviolet photons and that of VSGs emission. Such variations cannot be only explained by the extinction and therefore must trace real PAHs/VSGs depletion within dense gas where the smallest dust particles may stick on large grains and/or coagulate.

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