Probing the Activity in High-Z ULIRGs: High Resolution Spectroscopy in Neon and Argon Lines

Details Probing the Activity in High-Z ULIRGs: High Resolution Spectroscopy in Neon and Argon Lines Probing the Activity in High-Z ULIRGs: High Resolution Spectroscopy in Neon and Argon Lines

May 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sptz.prop30862n&link_type=abstract

Spitzer Proposal ID #30862

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Scientific paper

We propose to investigate the nature of a sample of high luminosity infrared bright galaxies in the redshift range of 0.6 to 3 through complete IRS high resolution spectroscopy. Our sample focuses on systems that we will observe in March 2006 in their 158 micron [CII] line emission using Cornell's submm grating spectrometer, ZEUS on the CSO. The combined [CII] and Spitzer IRS spectroscopy will comprise the thesis work of Cornell student Steven Hailey-Dunsheath. The combined data sets will (1) Determine the hardness of the ambient interstellar radiation fields thereby tracing the most massive stars on the main sequence, or revealing the presence of an AGN. (2) Determine the total ionizing flux from stars, hence the relative importance of starformation to accretion in creating the IR luminosity of these sources. (3) Determine the strength of the ambient far-UV radiation fields, hence the physical sizes of the starforming regions. The sources proposed here are among the most distant, and most luminous sources known in the Universe. As such, they are heavily studied by many research groups. We propose deep IRS high resolution spectroscopy for these sources, for which we have built a scientific case coupled to research going on in our group at Cornell. It is clear that the spectra that we obtain will be invaluable for many other science programs including future programs involving Herschel, and JWST. We therefore welcome and encourage collaborations.

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