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 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 ,
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/herschel/
Date Published 2012-08-24T04:46:35Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2012-08-24T04:46:35Z, OT1_gstacey_4, SPG v14.2.0. https://doi.org/10.5270/esa-jcl6pdk