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 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 ┬Ám range, bridging the gap between earlier infrared space missions and groundbased facilities.
Creator Contact https://support.cosmos.esa.int/herschel/
Date Published 2013-03-20T05:07:28Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-03-20T05:07:28Z, OT1_aweiss01_1, SPG v14.1.0. https://doi.org/10.5270/esa-lx5783g