Water in Star-forming Regions with the Herschel Space Observatory (WISH). I. Overview of Key Program and First Results
Artikel i vetenskaplig tidskrift, 2011

Water In Star-forming regions with Herschel (WISH) is a key program on the Herschel Space Observatory designed to probe the physical and chemical structures of young stellar objects using water and related molecules and to follow the water abundance from collapsing clouds to planet-forming disks. About 80 sources are targeted, covering a wide ranee of luminosities-from low (< 1 L-circle dot) to high (> 10(5) L-circle dot)-and a wide range of evolutionary stages-from cold prestellar cores to warm protostellar envelopes and outflows to disks around young stars. Both the HIFI and PACS instruments are used to observe a variety of lines of H2O, (H2O)-O-18 and chemically related species at the source position and in small maps around the protostars and selected outflow positions. In addition, high-frequency lines of CO, (CO)-C-13, and (CO)-O-18 are obtained with Herschel and are complemented by ground-based observations of dust continuum, HDO, CO and its isotopologs, and other molecules to ensure a self-consistent data set for analysis. An overview of the scientific motivation and observational strategy of the program is given, together with the modeling approach and analysis tools that have been developed. Initial science results are presented. These include a lack of water in cold gas at abundances that are lower than most predictions, strong water emission from shocks in protostellar environments, the importance of UV radiation in heating the gas along outflow walls across the full range of luminosities, and surprisingly widespread detection of the chemically related hydrides OH+ and H2O+ in outflows and foreground gas. Quantitative estimates of the energy budget indicate that H2O is generally not the dominant coolant in the warm dense gas associated with protostars. Very deep limits on the cold gaseous water reservoir in the outer regions of protoplanetary disks are obtained that have profound implications for our understanding of grain growth and mixing in disks.

hot cores

gas-phase

Victoria

D.] Natl Res Council Canada

l1157-b1

molecular clouds

chess spectral survey

RS INSU

far-infrared observations

protostellar shock

low-mass protostars

wave-astronomy-satellite

Herzberg Inst Astrophys

vela

France.

ngc-7129 firs 2

young stellar objects

UMR 5804

h2o

[Johnstone

Floirac

Författare

E. F. van Dishoeck

Max Planck-institutet

Universiteit Leiden

L. Kristensen

Universiteit Leiden

A. O. Benz

Eidgenössische Technische Hochschule Zürich (ETH)

E. A. Bergin

University of Michigan

P. Caselli

University of Leeds

Osservatorio Astrofisico di Arcetri

J. Cernicharo

Centro de Astrobiologia (CAB)

F. Herpin

Laboratoire d'Astrophysique de Bordeaux

M. R. Hogerheijde

Universiteit Leiden

D. Johnstone

University of Victoria

National Research Council Canada

René Liseau

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

B. Nisini

Osservatorio Astronomico di Roma

R. Shipman

Netherlands Institute for Space Research (SRON)

M. Tafalla

Observatorio Astronamico Nacional (OAN-IGN)

F. F. S. van der Tak

Netherlands Institute for Space Research (SRON)

Rijksuniversiteit Groningen

F. Wyrowski

Max Planck-institutet

Y. Aikawa

Kobe University

R. Bachiller

Observatorio Astronamico Nacional (OAN-IGN)

A. Baudry

Laboratoire d'Astrophysique de Bordeaux

M. Benedettini

Universita degli Studi di Roma Tor Vergata

Per Bjerkeli

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

G. A. Blake

Caltech Division of Geological and Planetary Sciences

S. Bontemps

Laboratoire d'Astrophysique de Bordeaux

J. Braine

Laboratoire d'Astrophysique de Bordeaux

C. Brinch

Universiteit Leiden

S. Bruderer

Eidgenössische Technische Hochschule Zürich (ETH)

L. Chavarría

Laboratoire d'Astrophysique de Bordeaux

C. Codella

Osservatorio Astrofisico di Arcetri

F. Daniel

Centro de Astrobiologia (CAB)

T. de Graauw

Netherlands Institute for Space Research (SRON)

E. Deul

Universiteit Leiden

A. M. di Giorgio

Universita degli Studi di Roma Tor Vergata

C. Dominik

Radboud Universiteit

Anton Pannekoek Institute for Astronomy

S. Doty

Denison University

M. L. Dubernet

Université Pierre et Marie Curie (UPMC)

Centre national de la recherche scientifique (CNRS)

P. Encrenaz

LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres

H. Feuchtgruber

Max Planck-institutet

M. Fich

University of Waterloo

W. Frieswijk

Netherlands Institute for Space Research (SRON)

A. Fuente

Observatorio Astronamico Nacional (OAN-IGN)

T. Giannini

Osservatorio Astronomico di Roma

J. R. Goicoechea

Centro de Astrobiologia (CAB)

F. P. Helmich

Netherlands Institute for Space Research (SRON)

G. J. Herczeg

Max Planck-institutet

T. Jacq

Laboratoire d'Astrophysique de Bordeaux

J. K. Jorgensen

Köbenhavns Universitet

A. Karska

Max Planck-institutet

M. J. Kaufman

San Jose State University

E. Keto

Harvard-Smithsonian Center for Astrophysics

B. Larsson

Stockholms universitet

B. Lefloch

Université Grenoble Alpes

D. Lis

CalTech

M. Marseille

Netherlands Institute for Space Research (SRON)

C. McCoey

University of Waterloo

Western University

G. J. Melnick

Harvard-Smithsonian Center for Astrophysics

D. A. Neufeld

Johns Hopkins University

Michael Olberg

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

L. Pagani

LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres

O. Panic

European Southern Observatory (ESO)

B. Parise

Max Planck-institutet

J. C. Pearson

Jet Propulsion Laboratory, California Institute of Technology

R. Plume

University of Calgary

C. Risacher

Netherlands Institute for Space Research (SRON)

D. Salter

Universiteit Leiden

J. Santiago-García

Instituto de Radioastronomia Milimetrica

P. Saraceno

Universita degli Studi di Roma Tor Vergata

P. Stauber

Eidgenössische Technische Hochschule Zürich (ETH)

T. A. van Kempen

Universiteit Leiden

R. Visser

Universiteit Leiden

S. Viti

University College London (UCL)

M. Walmsley

Osservatorio Astrofisico di Arcetri

S. F. Wampfler

Eidgenössische Technische Hochschule Zürich (ETH)

U. A. Yildiz

Universiteit Leiden

Publications of the Astronomical Society of the Pacific

0004-6280 (ISSN) 1538-3873 (eISSN)

Vol. 123 900 138-170

Ämneskategorier

Astronomi, astrofysik och kosmologi

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2018-09-07