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, spoon, h., 2013, DDT_hspoon_2, SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-6fsucfa