Speaker
Description
The interstellar dust extinction in the near- and mid-infrared (IR)
wavelength range (1-40 microns) is characterized by decreasing
continuum extinction and four main absorption features that are
diagnostic of dust grain compositions. The absorption features at 10
and 18 micron are due to silicate material, at 3.4 micron due to
hydrogenated carbon material, and at 3.0 micron due to water ice.
Measurements based on Spitzer spectroscopic observations from 5-40
micron provide a detailed view of the continuum extinction and
silicate absorption features in sightlines with A(V) values from 1.5
to 5.5 mag. As these sightlines all have existing ultraviolet
extinction measurements, this sample provides consistent measurements
of extinction from 0.1 to 40 microns giving strong, consistent
constraints on dust grain sizes and compositions. Plans for expanding
this work with JWST to include spectroscopic measurements in the
near-IR region (1-5 micron) and more sightlines are presented.
| Consider for a poster? | Yes |
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