|Probing the Interstellar Medium Conditions in High Redshift Starburst Galaxies
|Far-infrared and submillimeter emission lines trace the massive gas reservoirs which fuel the increased star formation seen at high redshift. While [CII] emission at 158 microns is the dominant cooling line in galaxies and directly traces the conditions in the interstellar medium, only a handful of studies have managed to detect CII at high redshift. We propose to double the number of published high redshift [CII] detections by observing 4 ultra-luminous infrared galaxies at z=1.2-2.5 with the SPIRE FTS. Our sample is unique in that it already has exquisite measurements of mid-IR spectral features and CO emission ensuring that we are observing gas-rich, starburst-dominated systems. Combining the [CII] measurements with line luminosities from CO and mid-IR spectroscopy we will complete a full diagnosis of the interstellar medium in these intensely star forming systems constraining the gas density, and the strength and source of the UV radiation field. This program is an excellent way to push the limits and showcase the capabilities of the SPIRE-FTS. We request a modest allocation of 21.7 hours (5.5 hours per source) to complete this detailed study of the astrophysical conditions in high redshift ultra-luminous infrared galaxies.
|Stacked Average Far-infrared Spectrum of Dusty Star-forming Galaxies from the Herschel-SPIRE Fourier Transform Spectrometer . Wilson Derek et al. . The Astrophysical Journal, Volume 848, Issue 1, article id. 30, 31 pp. (2017). . 848 . 10.3847/1538-4357/aa8cc7 . 2017ApJ...848...30W ,
|Herschel was launched on 14 May 2009! It is the fourth 'cornerstone' mission in the ESA science programme. With a 3.5 m Cassegrain telescope it is the largest space telescope ever launched. It is performing photometry and spectroscopy in approximately the 55-671 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
|Publisher And Registrant
|European Space Agency
|European Space Agency, 2013, OT1_apope_2, SPG v14.1.0. https://doi.org/10.5270/esa-zv7opgn