A dataset provided by the European Space Agency

Name OT2_mlee01_1
Title [CII] Observations of the Perseus Molecular Cloud
URL

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DOI 10.5270/esa-eeupp8y
Author lee, m.-y.
Description Numerical simulations have suggested that giant molecular clouds (GMCs) can form from converging supersonic flows. In this scenario, the dynamics and chemistry of gas are strongly coupled and chemical processes, such as the HI-H2 and CII-CO transition, play an important role in the formation and evolution of GMCs. In particular, recent 3D magnetohydrodynamical simulations track both a detailed dynamical and chemical cloud evolution for the first time and find a significant scatter in the spatial distribution of CII and CO. This suggests that molecule formation is heavily affected by turbulence and is highly contradictory to what stationary photodissociation region (PDR) models predict. We propose to observe two boundary regions of the Perseus molecular cloud in the 158 micron fine structure line of CII using the Herschel HIFI instrument. Our proposal will test theoretical predictions from two different models (stationery vs turbulent) and address the importance of turbulence in the molecule formation. In addition, the proposed [CII] observations will allow us to explore the "CO-dark" gas in Perseus and to test the recent PDR model of the "CO-dark" gas in GMCs. The HIFI instrument will be critical to achieve our scientific goals as it provides the high enough spatial and velocity resolution to investigate the spatial distribution of CII in detail and to separate Perseus from foreground and background [CII] emission.
Publication
Instrument HIFI_HifiPoint_load
Temporal Coverage 2012-07-31T18:33:38Z/2012-08-15T13:21:36Z
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 2013-02-15T12:26:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, 2013-02-15T12:26:00Z, OT2_mlee01_1, SPG v14.1.0. https://doi.org/10.5270/esa-eeupp8y