Spitzer Observations of the High-Latitude Translucent Cloud toward HD 210121: A Sightline with Exceedingly Anomalous Ultraviolet Interstellar Extinction

Details Spitzer Observations of the High-Latitude Translucent Cloud toward HD 210121: A Sightline with Exceedingly Anomalous Ultraviolet Interstellar Extinction Spitzer Observations of the High-Latitude Translucent Cloud toward HD 210121: A Sightline with Exceedingly Anomalous Ultraviolet Interstellar Extinction

Sep 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004sptz.prop.3669l&link_type=abstract

Spitzer Proposal ID #3669

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Scientific paper

The dust content in the high-galactic latitude translucent molecular cloud toward HD 210121 is of special interest. This is because the extinction curve of this sightline exhibits a far-ultraviolet rise that is among the steepest ever observed and has an exceptionally small total-to-selective extinction ratio (R_V = 2.1). We propose to perform low-resolution IRS spectroscopic observations (from 5--40 micron in both SL and LL modes) and MIPS 24, 70 and 160 micron imaging observations of the HD 210121 cloud. These data, when combined with existing extinction, polarization, and the 12, 25, 60, and 100 micron IRAS broadband photometry data, will allow us (1) to quantitatively constrain the properties of the dust in this cloud and in particular, those of the ultrasmall grains (e.g. PAHs); (2) to test the silicate/graphite-PAH model developed for the Milky Way diffuse interstellar medium and shown successful when applied to reflection nebulae and other galaxies; (3) to test the PAH model as the carrier of the 2175 Angstrom interstellar extinction hump which remains unidentified for 39 years since its first discovery; (4) to study the dust properties in relation to the interstellar environment.

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