A dataset provided by the European Space Agency

Name OT1_tvelusam_1
Title Structure of translucent clouds observed with HIFI [CII] 1.9THz and in H2 in absorption by FUSE
URL

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DOI https://doi.org/10.5270/esa-eo6uwwk
Author European Space Agency
Description We propose HIFI observations of 1.9 THz (158 micron) [CII] line emission in selected 27 lines of sight (LOSs) which have been observed in H2 absorption in UV by FUSE, and three observed in [CII ]2325A absorption by STIS. [CII] observations provide a powerful probe of warm diffuse clouds, and [CII] is a useful as a tracer of their warm H2 content. By combining FUSE and STIS which directly detects H2 and C+ in absorption and the HIFI [CII] data we can better constrain many of the physical conditions in the cloud including the density and pressure of the C+ gas. The [CII] line emission spectra will be complimentary to those observed in absorption in UV and, in addition to its extremely high velocity resolution, help us resolve the narrow absorption features in the H2 and HI gas. A comparison of the molecular H2 column densities inferred from the 1.9THz [CII] line in the clouds along the FUSE/STIS LOS with those directly measured by them will validate the interpretation of the HIFI [CII] emission observed by larger scale Galactic surveys. We request 22.7 hrs of observing time on HIFI in band 7b.
Publication Internal structure of spiral arms traced with [C II]: Unraveling the warm ionized medium, H I, and molecular emission lanes . Velusamy T. et al. . Astronomy & Astrophysics, Volume 578, id.A135, 12 pp. . 578 . 10.1051\/0004-6361\/201525902 . 2015A&A...578A.135V ,
Thermal Pressure in Diffuse H2 Gas Measured by Herschel [C II] Emission and FUSE UV H2 Absorption . Velusamy T. et al. . The Astrophysical Journal, Volume 838, Issue 2, article id. 165, 15 pp. (2017). . 838 . 10.3847\/1538-4357\/aa5eaf . 2017ApJ...838..165V ,
Instrument HIFI_HifiPoint_load, HIFI_HifiMapping_load-raster
Temporal Coverage 2011-10-25T22:12:25Z/2012-09-28T12:01:25Z
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 2013-03-28T11:23:24Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013, Structure Of Translucent Clouds Observed With Hifi Square_Bracket_Openciisquare_Bracket_Close 1.9Thz And In H2 In Absorption By Fuse, SPG v14.1.0, European Space Agency, https://doi.org/10.5270/esa-eo6uwwk