A dataset provided by the European Space Agency

Name SDP_ebergin_3
Title HEXOS: Herschel Observations of Extra-Ordinary Sources: The Orion and Sgr B2 Star-Forming Regions


DOI https://doi.org/10.5270/esa-gk94vvn
Author bergin, e.
Description As a GT Key Program we propose to perform full HIFI and PACS line surveys of 5
sources in the giant molecular clouds Orion and Sagittarius B2. These
extraordinary star-forming regions contain the best studied examples of
physical and chemical processes prevalent in the interstellar medium, including
gravitational compression, thermal and turbulent pressure support,
photodissociation, gas and grain chemistry in dense and diffuse quiescent gas,
and shocks. With high excitation, rich chemistry, and large molecular column they
give the highest chance for new detections in a sensitive search for new
molecules. Line surveys of sources (Orion KL, Orion S, Orion Bar, Sgr B2 N+M)
defined by these phenomena form the backbone of this proposed program.

Herschel offers unprecedented sensitivity and relative calibration accuracy,
as well as continuous spectral coverage across the gaps imposed by the
atmosphere, opening up a largely unexplored wavelength regime to high
resolution spectroscopy. These data will take line surveys to a new level and
we will use them to comprehensively characterize the physics (density,
thermal balance, kinematics, radiation field) and chemistry (chemical assay,
ionization, deuterium fractionation, water ortho/para ratio) of star-forming
molecular gas in a manner not previously possible. The opening of this
spectral range is also an opportunity to detect the bending transitions of
carbon chains and polycyclic aromatic hydrocarbons, along with the
rotational transitions of complex organics.

Given that these sources have the richest emission spectra seen for star-forming regions in the Galaxy, we anticipate that the proposed observations will define the sub-millimeter/far infrared region of the spectrum and that these data will form a lasting Herschel legacy.
Publication The physical and chemical structure of Sagittarius B2. I. Three-dimensional thermal dust and free-free continuum modeling on 100 au to 45 pc scales . Schmiedeke A. et al. . Astronomy & Astrophysics, Volume 588, id.A143, 30 pp. . 588 . 10.1051\/0004-6361\/201527311 . 2016A&A...588A.143S ,
Herschel observations of ortho- and para-oxidaniumyl (H2O+) in spiral arm clouds toward Sagittarius B2(M) . Schilke P. et al. . Astronomy and Astrophysics, Volume 521, id.L11, 7 pp. . 521 . 10.1051\/0004-6361\/201015087 . 2010A&A...521L..11S ,
Herschel observations of deuterated water towards Sgr B2(M) . Comito C. et al. . Astronomy and Astrophysics, Volume 521, id.L38, 5 pp. . 521 . 10.1051\/0004-6361\/201015121 . 2010A&A...521L..38C ,
Reversal of infall in SgrB2(M) revealed by Herschel/HIFI observations of HCN lines at THz frequencies . Rolffs R. et al. . Astronomy and Astrophysics, Volume 521, id.L46, 5 pp. . 521 . 10.1051\/0004-6361\/201015106 . 2010A&A...521L..46R ,
Herschel observations of extraordinary sources: full Herschel/HIFI molecular line survey of Sagittarius B2(M) . Möller T. et al. . Astronomy and Astrophysics . null . null . 2021A&A...651A...9M ,
Herschel/HIFI measurements of the ortho/para ratio in water towards Sagittarius B2(M) and W31C . Lis D. C. et al. . Astronomy and Astrophysics, Volume 521, id.L26, 5 pp. . 521 . 10.1051\/0004-6361\/201015072 . 2010A&A...521L..26L ,
Interstellar bromine abundance is consistent with cometary ices from Rosetta . Ligterink N. F. W. et al. . Astronomy & Astrophysics, Volume 614, ...
Instrument HIFI_HifiFS_freq
Temporal Coverage 2010-03-01T01:52:07Z/2010-03-05T05:36:28Z
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 2010-05-01T00:00:00Z
Publisher And Registrant European Space Agency
Credit Guidelines European Space Agency, bergin, e., 2010, SDP_ebergin_3, SPG v14.1.0, European Space Agency, https://doi.org/10.5270/esa-gk94vvn