A dataset provided by the European Space Agency

Name OT1_gstacey_4
Title Water and CO: Signatures of Microturbulent Shocks in NGC 891
URL

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DOI https://doi.org/10.5270/esa-jcl6pdk
Author stacey, g.
Description We propose to detect and map rotational line emission
from water and CO in the edge-on spiral galaxy, NGC 891.
Both water and CO rotational lines are important coolants for low
velocity C-shocks resulting from micro-turbulence in
molecular clouds. The water lines are of particular
interest, as they are definitive shock tracers on
galactic scales. Micro-turbulent shocks are an
important process through which molecular clouds dispel
their turbulent kinetic energy enabling them to collapse
and to form stars. NGC 891 is the ideal source for
detecting shock tracers from the more quiescent ISM
within a normal spiral galaxy: it is presented to us
edge-on so that column densities along the line of
sight are quite large, and it is nearby so that the
edge-on geometry still nearly fills the Herschel
spectrometer beams. The combination of high columns,
and good beam match enables the detection of
particularly weak lines. Our search is motivated by
our recent study of NGC 891 in its H2 rotational line
and [OI], [CII], and [NII] fine-structure line
emission that provides strong evidence for
micro-turbulent shock excitation of the S(2) and S(1)
rotational lines. These lines are bright, and within C-shock models,
several water lines are predicted to be nearly equally
bright, and readily detectable with Herschel/PACS and HIFI,
and the rotational ladder of CO is detectable with
SPIRE. The proposed Herschel observations of water
CO will provide the first definitive indicators
of the micro-turbulent shocks that along with H2 line
emission are the dominant coolants for molecular cloud
interiors. Herschel is the only facility that can
observe these water lines that are totally obscurred
by the Earth.s atmosphere even at aircraft altitudes.
Publication On the far-infrared metallicity diagnostics: applications to high-redshift galaxies . Rigopoulou D. et al. . Monthly Notices of the Royal Astronomical Society, Volume 473, Issue 1, p.20-29 . 473 . 10.1093\/mnras\/stx2311 . 2018MNRAS.473...20R ,
The Herschel SPIRE Fourier Transform Spectrometer Spectral Feature Finder - II. Estimating radial velocity of SPIRE spectral observation sources . Scott Jeremy P. et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2020MNRAS.496.4894S ,
The distribution of dust in edge-on galaxies: I. The global structure . Mosenkov Aleksandr V. et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2022MNRAS.515.5698M ,
The Herschel SPIRE Fourier Transform Spectrometer Spectral Feature Finder - III. Line identification and off-axis spectra . Benson Chris S. et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2020MNRAS.496.4906B ,
The Herschel SPIRE Fourier Transform Spectrometer Spectral Feature Finder I. The Spectral Feature Finder and Catalogue . Hopwood R. et al. . Monthly Notices of the Royal Astronomical Society . null . null . 2020MNRAS.496.4874H ,
High-J CO versus Far-infrared Relations in Normal and Starburst Galaxies . Liu Daizhong et al. . The Astrophysical Journal Letters, Volume 810, Issue 2, article id. L14, 6 pp. (2015). . 810 . 10.1088\/2041-8205\/810\/2\/L14 . 2015ApJ...810L..14L ,
Insights into gas heating and cooling in the disc of NGC 891 from Herschel far-infrared spectroscopy⋆⋆⋆ . Hughes T. M. et al. . Astronomy & Astrophysics, Volume 575, id.A17, 25 pp. . 575 . 10.1051\/0004-6361\/201424732 . 2015A&A...575A..17H ,
Instrument SPIRE_SpireSpectrometer_, HIFI_HifiPoint_dbs, PACS_PacsLineSpec_point
Temporal Coverage 2011-07-26T20:16:46Z/2012-02-24T06:47:32Z
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 2012-08-24T04:46:35Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, stacey, g., 2012, OT1_gstacey_4, SPG v14.2.0, European Space Agency, https://doi.org/10.5270/esa-jcl6pdk