A dataset provided by the European Space Agency

Name OT2_jfisch01_1
Title Far-Infrared Full Spectroscopic Signatures of the Massive Molecular Outflows in the (U)LIRGs Mrk 231 and NGC 6240
URL

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DOI 10.5270/esa-2mjrj5n
Author fischer, j.
Description One of the exciting new results of the Herschel mission is the discovery of massive, high velocity (v ~ 1000 km-sec) molecular outflows in ultraluminous infrared galaxies (ULIRGs). These outflows, powered by stellar processes or by AGN, are so far, best traced by radiatively pumped far-IR OH transitions and are observed in numerous transitions as P-Cygni, absorption, or emission line profiles. Based on our modeling of the lines and continuum, the OH observations imply short gas depletion times, mass loss rates at least several times higher than the star formation rates, and appear strongest in AGN dominated ULIRGs. These mergers of gas-rich galaxies have been caught in the act of dispersing their star-forming molecular fuel as they evolve toward becoming massive, gas-poor ellipticals! Are these outflows driven by radio jets or radiation pressure due to a partially buried AGN or are compact super-starburst winds carving out a view to a previously hidden AGN? We and others have tuned Herschel PACS spectroscopic scans to one or more OH lines in surveys of infrared-bright galaxies to combine with modeling efforts to derive the parameters of these winds. However, in order to help understand the excitation and radiative effects producing these winds and thus to better ascertain the nature of the driving source(s), we propose to fill in the gaps and thus obtain full PACS spectral scans of two key outflow sources: Mrk 231, a broad absorption line (BAL) quasar, and NGC 6240, a close pair of X-ray luminous AGN. The PACS spectral resolution and sensitivity will enable unprecedented understanding of the outflow mass-loss rates, energetics, and the radiative environments to which their ISM is exposed, based on velocity-resolved line profiles of multiple excited level transitions of OH, H2O, CO, OH+, H2O+, and other molecules. A key goal of this program is to provide foundations for the modeling ...
Publication
Instrument PACS_PacsRangeSpec_point
Temporal Coverage 2012-09-25T04:36:26Z/2012-10-16T14:49:29Z
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 2013-04-16T14:07:39Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-04-16T14:07:39Z, OT2_jfisch01_1, SPG v14.2.0. https://doi.org/10.5270/esa-2mjrj5n