|Herschel Spectroscopy of Lensed High-Redshift Galaxies.
|We propose Herschel spectroscopic observations of the [C II]158 um and [O I]63 um emission lines in 4 extremely bright, lensed, high-redshift galaxies. Herschel photometric surveys conducted toward galaxy clusters have identified these highly magnified sources, which would otherwise be undetectable below the confusion limit of the instrument. These exceptional targets provide the unique opportunity to study the characteristics of the ISM in typical galaxies with moderate luminosities at high redshift. Recent studies have identified key differences between the far-infrared properties of local LIRGS-ULIRGS and galaxies of comparable luminosity at high redshift. However, the highest redshift observations are inherently biased toward more luminous galaxies, making it difficult to extend this comparison to the abundant population which is intrinsically faint. Herschel spectroscopy of highly magnified galaxies provides the only means to probe the physical conditions within this more typical population. Measurements of the [C II] and [O I] cooling lines are sensitive to the temperature and density of the gas surrounding starforming regions, as well as the strength of the incident far ultraviolet radiation from starbursts. These observations will provide insight into the environmental conditions that drive the differences between high-redshift star-forming galaxies and those in the local universe.
|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, OT2_mrex_2, SPG v14.2.0. https://doi.org/10.5270/esa-f09lyi2