A dataset provided by the European Space Agency

Name OT1_dlis_2
Title Ammonia as a Tracer of the Earliest Stages of Star Formation
URL

http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342238591&instrument_name=HIFI&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342238592&instrument_name=HIFI&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342238650&instrument_name=HIFI&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342240927&instrument_name=HIFI&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342240932&instrument_name=HIFI&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342242866&instrument_name=HIFI&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342250433&instrument_name=HIFI&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342250470&instrument_name=HIFI&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342250745&instrument_name=HIFI&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342251229&instrument_name=HIFI&product_level=LEVEL0&compress=true
http://archives.esac.esa.int/hsa/whsa-tap-server/data?retrieval_type=OBSERVATION&observation_id=1342251430&instrument_name=HIFI&product_level=LEVEL0&compress=true
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DOI https://doi.org/10.5270/esa-51qg935
Author lis, d.
Description Stars form in molecular cloud cores, cold and dense regions enshrouded
by dust. The initiation of this process is among the least understood
steps of star formation. Highresolution heterodyne spectroscopy
provides invaluable information about the physical conditions
(density, temperature), kinematics (infall, outflows), and chemistry of
these regions. Classical molecular tracers, such CO, CS, and many other
abundant gasphase species, have been shown to freeze out onto dust
grain mantles in prestellar cores. However, Nbearing species, in
particular ammonia, are much less affected by depletion and are
observed to stay in the gas phase at densities in excess of 1e6 cm3.
The molecular freezeout has important consequences for the
chemistry of dense gas. In particular, the depletion of abundant
gasphase species with heavy atoms drives up abundances of
deuterated H3+ isotopologues, which in turn results in spectacular
deuteration levels of molecules that do remain in the gas phase.
Consequently, lines of deuterated Nbearing species, in particular
the fundamental lines of ammonia isotopologues, having very high
critical densities, are optimum tracers of innermost regions of dense
cores.

We propose to study the morphology, density structure and kinematics
of cold and dense cloud cores, by mapping the spatial distribution of
ammonia isotopologues in isolated dense prestellar cores using
Herschel/HIFI. These observations provide optimum probes of the
onset of star formation, as well as the physical processes that control
gasgrain interaction, freezeout, mantle ejection and deuteration.
The sensitive, highresolution spectra acquired within this program
will be analyzed using sophisticated radiative transfer models and
compared with outputs of stateoftheart 3D MHD simulations
and chemical models developed by the members of our team.
Publication Star Formation and Feedback: A Molecular Outflow-Prestellar Core Interaction in L1689N . Lis D. C. et al. . The Astrophysical Journal, Volume 827, Issue 2, article id. 133, 13 pp. (2016). . 827 . 10.3847\/0004-637X\/827\/2\/133 . 2016ApJ...827..133L ,
Instrument HIFI_HifiPoint_fs, HIFI_HifiMapping_fly
Temporal Coverage 2012-02-02T02:01:33Z/2012-09-26T06:34:40Z
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 2013-03-26T04:18:13Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, lis, d., 2013, OT1_dlis_2, SPG v14.1.0, European Space Agency, https://doi.org/10.5270/esa-51qg935