A dataset provided by the European Space Agency

Name OT1_mbradfor_1
Title The Impact of Quasars on their Host Galaxies: Gas Conditions and Star Formation in the Central Kiloparsec
URL

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DOI 10.5270/esa-xbk01mg
Author bradford, m.
Description We propose to study the impact of powerful quasars on the star-forming gas in their host galaxies. central kiloparsec with a 44-hour program using the PACS and SPIRE spectrometers. We are targeting four intrinsically luminous and gravitationally-lensed AGN systems in the z~2-4 era which show evidence of obscured star formation in their hosts. We will measure the five bright far-IR fine-structure transitions: [SiII] 35, [OI] 63, [OIII] 52 & 88, and [CII] 158 which are the dominant interstellar gas coolants in galaxies. We will combine the Herschel line fluxes with Z-Spec measurements of the peak of the CO spectrum to provide a complete census of the atomic and molecular gas mass and cooling in the central kpc of these systems. Our datasets will allow us to perform two key experiments: 1) What heats the gas in the central kpc? When compared with one another and the dust continuum, the line measurements distinguish between UV-photon heating in photo-dissociation regions (PDRs) and bulk heating due to X-rays and-or cosmic rays. Relative to the PDRs, the bulk heating sources are very efficient at heating the gas and produce strong line-to-continuum ratios as well as an enhanced [SiII] - [CII] ratio. If X-rays or cosmic rays are really an important heating source, we will see unusually strong [SiII] and [OI] in these systems. 2) Is the stellar mass function biased toward high masses in these systems? It has been proposed that bulk heating mechanisms are likely to impact the stellar IMF, boosting the characteristic mass by as much as an order of magnitude relative to the Galaxy. Our measurements of the [OIII] transitions, when compared with the far-IR continuum or [CII] which trace total star formation provide a measure of the fraction of very massive stars in the stellar IMF. Similarly, comparison of the [OIII intensities and lower-ionization species (including upper limits) probe the stellar effective temperature through comparison with nebular models.
Publication
Instrument SPIRE_SpireSpectrometer_, SPIRE_SpirePhoto_small, PACS_PacsLineSpec_point
Temporal Coverage 2011-09-28T15:05:24Z/2013-03-25T04:22:32Z
Version SPG v14.2.0
Mission Description 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 ┬Ám range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/herschel/
Date Published 2013-09-25T04:05:55Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-09-25T04:05:55Z, OT1_mbradfor_1, SPG v14.2.0. https://doi.org/10.5270/esa-xbk01mg