Spitzer Observations of the Molecular Cloud toward HD 62542: A Sightline with Exceedingly Anomalous 2175 Angstrom Extinction Bump

Details Spitzer Observations of the Molecular Cloud toward HD 62542: A Sightline with Exceedingly Anomalous 2175 Angstrom Extinction Bump Spitzer Observations of the Molecular Cloud toward HD 62542: A Sightline with Exceedingly Anomalous 2175 Angstrom Extinction Bump

Jun 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005sptz.prop20420l&link_type=abstract

Spitzer Proposal ID #20420

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Scientific paper

The 2175 Angstrom bump is the strongest spectroscopic interstellar extinction feature. Its carrier remains unidentified 40 years after its first detection. The molecular cloud toward HD 62542 is of special interest, because the extinction toward HD 62542 exhibits an exceedingly anomalous 2175 Angstrom bump -- extremely broad and weak and peaking at 2110 Angstrom, in marked contrast to the near-invariant peak wavelength of 2175 Angstrom for most sightlines. We propose to perform low-resolution IRS spectroscopic observations (from 5--40 micron in both SL and LL modes), IRAC 3.5, 4.5, 5.8, 8 micron and MIPS 24, 70 micron imaging observations of the HD 62542 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; (4) to study the dust properties in relation to the interstellar environment.

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