A dataset provided by the European Space Agency

Name DDT_hspoon_2
Title Herschel.s first and last chance to quantify the two most powerful molecular outflows in the Local Universe


DOI https://doi.org/10.5270/esa-6fsucfa
Author spoon, h.
Description As part of the Herschel ULIRG Survey (HERUS) we have recently discovered within two objects extraordinarily powerful molecular outflows in OH. These outflows are substantially more powerful than those seen in Mrk231, which was the most powerful outflow source known to date. These two sources, IRAS 03158+4227 and IRAS 20100-4156, may thus host the two most powerful molecular outflows known in the Local Universe. The properties of these outflows have fundamental implications for understanding how AGN affect their environments. On a focused level, the AGN in these two sources are much more obscured than the AGN in Mrk231, implying that we may have caught these outflows in their earliest, most powerful phase. On a wider level, the impact of AGN outflows is thought to be critical in shaping the galaxy mass function at all redshifts, so the properties of these very powerful outflows in these two systems may be vital in understanding this impact. At the moment, however, we lack the data needed to constrain the properties of the outflows. We discovered the outflow signatures in the line profiles of the groundstate transitions of OH at 79 and 119 microns. From these two observations the total OH column density and covering factor of the outflow can be inferred, but not the all-important mass outflow rate and timescale. To do so, we need observations of the doublets of excited OH at 65 and 84 micron, since these excited levels are sensitive to the FIR radiation density around the source, and thus to the compactness of the outflow. Herschel is the only facility in the foreseeable future that can provide these data.
Publication Molecular Outflows in Local ULIRGs: Energetics from Multitransition OH Analysis . González-Alfonso E. et al. . The Astrophysical Journal, Volume 836, Issue 1, article id. 11, 41 pp. (2017). . 836 . 10.3847/1538-4357/836/1/11 . 2017ApJ...836...11G ,
Instrument PACS_PacsRangeSpec_point
Temporal Coverage 2013-02-05T01:09:17Z/2013-03-20T14:55:12Z
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 µm range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/h®erschel/
Date Published 2013-09-20T13:49:43Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-09-20T13:49:43Z, DDT_hspoon_2, SPG v14.2.0. https://doi.org/10.5270/esa-6fsucfa