Water in low-mass star-forming regions with Herschel. HIFI spectroscopy of NGC 1333
Journal article, 2010

"Water In Star-forming regions with Herschel" (WISH) is a key programme dedicated to studying the role of water and related species during the star-formation process and constraining the physical and chemical properties of young stellar objects. The Heterodyne Instrument for the Far-Infrared (HIFI) on the Herschel Space Observatory observed three deeply embedded protostars in the low-mass star-forming region NGC 1333 in several H216O, H218O, and CO transitions. Line profiles are resolved for five H216O transitions in each source, revealing them to be surprisingly complex. The line profiles are decomposed into broad (>20 kms-1), medium-broad (~5-10 kms-1), and narrow (<5 kms-1) components. The H218O emission is only detected in broad 110-101 lines (>20 kms-1), indicating that its physical origin is the same as for the broad H216O component. In one of the sources, IRAS4A, an inverse P Cygni profile is observed, a clear sign of infall in the envelope. From the line profiles alone, it is clear that the bulk of emission arises from shocks, both on small (\lap1000 AU) and large scales along the outflow cavity walls (~10 000 AU). The H2O line profiles are compared to CO line profiles to constrain the H2O abundance as a function of velocity within these shocked regions. The H2O/CO abundance ratios are measured to be in the range of ~0.1-1, corresponding to H2O abundances of ~10-5-10-4 with respect to H2. Approximately 5-10% of the gas is hot enough for all oxygen to be driven into water in warm post-shock gas, mostly at high velocities.

stars: formation

ISM: jets and outflows

astrochemistry

ISM: molecules

ISM: individual objects: NGC 1333

Author

L. Kristensen

Leiden University

R. Visser

Leiden University

E. F. van Dishoeck

Max Planck Institute

Leiden University

U. A. Yildiz

Leiden University

S. Doty

Denison University

G. J. Herczeg

Max Planck Institute

F.-C. Liu

Max Planck Institute

B. Parise

Max Planck Institute

J. K. Jorgensen

University of Copenhagen

T. A. van Kempen

Harvard-Smithsonian Center for Astrophysics

C. Brinch

Leiden University

S. F. Wampfler

Swiss Federal Institute of Technology in Zürich (ETH)

S. Bruderer

Swiss Federal Institute of Technology in Zürich (ETH)

A. O. Benz

Swiss Federal Institute of Technology in Zürich (ETH)

M. R. Hogerheijde

Leiden University

E. Deul

Leiden University

R. Bachiller

Observatorio Astronamico Nacional (OAN-IGN)

A. Baudry

Laboratoire d'Astrophysique de Bordeaux

M. Benedettini

Istituto di Fisica dello Spazio Interplanetario, Rome

E. A. Bergin

University of Michigan

Per Bjerkeli

Chalmers, Department of Radio and Space Science, Radio Astronomy and Astrophysics

G. A. Blake

Caltech Division of Geological and Planetary Sciences

S. Bontemps

Laboratoire d'Astrophysique de Bordeaux

J. Braine

Laboratoire d'Astrophysique de Bordeaux

P. Caselli

Arcetri Astrophysical Observatory

University of Leeds

J. Cernicharo

Centro de Astrobiologia (CAB)

C. Codella

Arcetri Astrophysical Observatory

F. Daniel

Centro de Astrobiologia (CAB)

T. de Graauw

Netherlands Institute for Space Research (SRON)

A. M. di Giorgio

Istituto di Fisica dello Spazio Interplanetario, Rome

C. Dominik

Radboud University

Anton Pannekoek Institute for Astronomy

P. Encrenaz

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

M. Fich

University of Waterloo

A. Fuente

Observatorio Astronamico Nacional (OAN-IGN)

T. Giannini

Osservatorio Astronomico di Roma

J. R. Goicoechea

Centro de Astrobiologia (CAB)

F. Helmich

Netherlands Institute for Space Research (SRON)

F. Herpin

Laboratoire d'Astrophysique de Bordeaux

T. Jacq

Laboratoire d'Astrophysique de Bordeaux

D. Johnstone

University of Victoria

National Research Council Canada

M. J. Kaufman

San Jose State University

B. Larsson

Stockholm University

D. Lis

California Institute of Technology (Caltech)

René Liseau

Chalmers, Department of Radio and Space Science, Radio Astronomy and Astrophysics

M. Marseille

Netherlands Institute for Space Research (SRON)

C. McCoey

Western University

University of Waterloo

G. J. Melnick

Harvard-Smithsonian Center for Astrophysics

D. A. Neufeld

Johns Hopkins University

B. Nisini

Osservatorio Astronomico di Roma

Michael Olberg

Chalmers, Earth and Space Sciences, Onsala Space Observatory

J. C. Pearson

Jet Propulsion Laboratory, California Institute of Technology

R. Plume

University of Calgary

C. Risacher

Netherlands Institute for Space Research (SRON)

J. Santiago-García

Instituto de Radioastronomia Milimetrica

P. Saraceno

Istituto di Fisica dello Spazio Interplanetario, Rome

R. Shipman

Netherlands Institute for Space Research (SRON)

M. Tafalla

Observatorio Astronamico Nacional (OAN-IGN)

Aggm Tielens

Leiden University

F. F. S. van der Tak

Netherlands Institute for Space Research (SRON)

University of Groningen

F. Wyrowski

Max Planck Institute

D. Beintema

Netherlands Institute for Space Research (SRON)

A. de Jonge

Netherlands Institute for Space Research (SRON)

P. Dieleman

Netherlands Institute for Space Research (SRON)

V. Ossenkopf

University of Cologne

P. Roelfsema

Netherlands Institute for Space Research (SRON)

J. Stutzki

University of Cologne

N. Whyborn

Atacama Large Millimeter-submillimeter Array (ALMA)

Astronomy and Astrophysics

0004-6361 (ISSN) 1432-0746 (eISSN)

Vol. 521 1 Art. Nr. L30- L30

Subject Categories

Astronomy, Astrophysics and Cosmology

Roots

Basic sciences

DOI

10.1051/0004-6361/201015100

More information

Latest update

9/6/2018 1