A dataset provided by the European Space Agency

Name OT1_aweiss01_1
Title Velocity resolved HIFI spectroscopy of water lines in actively starforming galaxies
URL

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DOI https://doi.org/10.5270/esa-lx5783g
Author weiss, a.
Description Recent Herschel spectroscopy has shown that water lines can be very
prominent in the submm spectra of infra-red (IR) bright galactic
nuclei. Water can efficiently be excited by the IR photons of the dust
continuum and via collisions of shock-heated gas in starforming
regions. In the later case H _2 O contributes significantly to the gas
cooling. So far, the relative importance of the processes driving the
water excitation are largely unknown. This is mainly because the submm
lines of water in extragalactic systems have only become accessible
with the launch of Herschel.

Our first velocity-resolved HIFI spectroscopy of low-level water
transitions in actively starforming galaxies shows that water line
profiles are formed by a mix of emission and absorption features and
that the line profiles strongly vary between different water
transitions. This shows that a lot of information on the underlying
ISM structure is imprinted on the line profiles. On the other hand
this implies, that velocity resolved spectroscopy is required in order
to investigate the water excitation and the underlying physical
conditions of the ISM.

We here propose to observe a set of five medium and high energy water
lines using HIFI in a sample of active galaxies which are
representative for a wide range of nuclear environments. In
conjunction with the low-level water lines form the HEXGAL GT-KP this
line selection will allow us to model the water excitation in
outstanding detail and to investigate the relative contribution of the
water excitation channels as a function of environment, derive
chemical abundances and to investigate the underlying physical
parameters of the gas.
Publication HIFI Spectroscopy of H2O Submillimeter Lines in Nuclei of Actively Star-forming Galaxies . Liu L. et al. . The Astrophysical Journal, Volume 846, Issue 1, article id. 5, 35 pp. (2017). . 846 . 10.3847\/1538-4357\/aa81b4 . 2017ApJ...846....5L ,
Instrument HIFI_HifiPoint_dbs
Temporal Coverage 2011-06-09T00:10:14Z/2012-09-20T05:55:15Z
Version SPG v14.1.0
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 2013-03-20T05:07:28Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, weiss, a., 2013, OT1_aweiss01_1, SPG v14.1.0, European Space Agency, https://doi.org/10.5270/esa-lx5783g