The First Investigation of the 3.3 Micron PAH Feature at High Redshift: Preparation for the Warm Mission, WISE, and JWST

Details The First Investigation of the 3.3 Micron PAH Feature at High Redshift: Preparation for the Warm Mission, WISE, and JWST The First Investigation of the 3.3 Micron PAH Feature at High Redshift: Preparation for the Warm Mission, WISE, and JWST

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50419s&link_type=abstract

Spitzer Proposal ID #50419

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Scientific paper

The Polycyclic Aromatic Hydrocarbon (PAH) emission features in the mid-IR allow us to study the properties of dust in star-forming galaxies. The 3.3 micron feature is unique amongst these, as it probes the smaller dust grains and is very sensitive to the ionization level of the PAHs. Its importance is increased at high redshift (z > 2), as other PAH features begin to redshift out of the wavelength range of Spitzer IRS or JWST and it is the only dust emission feature accessible at z > 3 with Spitzer. At high redshift, where star-formation rates are higher and stellar masses are lower, the 3.3 micron feature may have markedly higher equivalent widths than observed in local starbursts. In fact, there is evidence that the 3.3 micron feature significantly affects the IRAC (as well as Akari, WISE and JWST) fluxes in star-forming galaxies at z < 2, which may influence stellar mass and photometric redshift estimations. Despite its importance for future high-redshift studies of dust in starburst galaxies, there have been no reported detections of the 3.3 micron feature with Spitzer. We propose IRS Short-Low spectroscopy of nine star-forming galaxies at z ~ 0.75 in the GOODS fields, to detect the 3.3 micron feature and determine how it correlates with the 6.2 & 7.7 features, warm dust measured at 16/24/70 microns, and the total infrared luminosity as inferred from the radio-IR correlation. With these data, we can predict the effects of the 3.3 micron feature on existing (Spitzer, Akari) and future (WISE, Spitzer Warm Mission) photometric surveys, and determine how to best use JWST spectra to quantify dust properties at the highest redshifts.

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