Herschel/HIFI observations of high-J CO lines in the NGC 1333 low-mass star-forming region
Journal article, 2010

Herschel/HIFI observations of high-J lines (up to J_u = 10) of ^12CO, ^13CO and C^18O are presented toward three deeply embedded low-mass protostars, NGC 1333 IRAS 2A, IRAS 4A, and IRAS 4B, obtained as part of the Water In Star-forming regions with Herschel (WISH) key program. The spectrally-resolved HIFI data are complemented by ground-based observations of lower-J CO and isotopologue lines. The ^12CO 10-9 profiles are dominated by broad (FWHM 25-30 km s^-1) emission. Radiative transfer models are used to constrain the temperature of this shocked gas to 100-200 K. Several CO and ^13CO line profiles also reveal a medium-broad component (FWHM5-10 km s^-1), seen prominently in H_2O lines. Column densities for both components are presented, providing a reference for determining abundances of other molecules in the same gas. The narrow C^18O 9-8 lines probe the warmer part of the quiescent envelope. Their intensities require a jump in the CO abundance at an evaporation temperature around 25 K, thus providing new direct evidence for a CO ice evaporation zone around low-mass protostars.

astrochemistry

stars: formation

ISM: jets and outflows

ISM: molecules

Author

U. A. Yildiz

Leiden University

E. F. van Dishoeck

Leiden University

Max Planck Institute

L. Kristensen

Leiden University

R. Visser

Leiden University

J. K. Jorgensen

University of Copenhagen

G. J. Herczeg

Max Planck Institute

T. A. van Kempen

Harvard-Smithsonian Center for Astrophysics

Leiden University

M. R. Hogerheijde

Leiden University

S. Doty

Denison University

A. O. Benz

Swiss Federal Institute of Technology in Zürich (ETH)

S. Bruderer

Swiss Federal Institute of Technology in Zürich (ETH)

S. F. Wampfler

Swiss Federal Institute of Technology in Zürich (ETH)

E. Deul

Leiden University

R. Bachiller

Spanish National Observatory (OAN)

A. Baudry

Laboratoire d'Astrophysique de Bordeaux

M. Benedettini

University of Rome Tor Vergata

E. A. Bergin

University of Michigan

Per Bjerkeli

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

G. A. Blake

California Institute of Technology (Caltech)

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)

A. M. di Giorgio

University of Rome Tor Vergata

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

Spanish National Observatory (OAN)

T. Giannini

Osservatorio Astronomico di Roma

J. R. Goicoechea

Centro de Astrobiologia (CAB)

T. de Graauw

Netherlands Institute for Space Research (SRON)

F. Helmich

Netherlands Institute for Space Research (SRON)

F. Herpin

Laboratoire d'Astrophysique de Bordeaux

T. Jacq

Laboratoire d'Astrophysique de Bordeaux

D. Johnstone

National Research Council Canada

University of Victoria

B. Larsson

Stockholm University

D. Lis

California Institute of Technology (Caltech)

René Liseau

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

F.-C. Liu

Max Planck Institute

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

B. Parise

Max Planck Institute

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 Radioastronomía Milimétrica

P. Saraceno

University of Rome Tor Vergata

R. Shipman

Netherlands Institute for Space Research (SRON)

M. Tafalla

Spanish National Observatory (OAN)

Aggm Tielens

Leiden University

F. F. S. van der Tak

Netherlands Institute for Space Research (SRON)

University of Groningen

F. Wyrowski

Max Planck Institute

P. Dieleman

Netherlands Institute for Space Research (SRON)

W. Jellema

Netherlands Institute for Space Research (SRON)

V. Ossenkopf

University of Cologne

R. Schieder

University of Cologne

J. Stutzki

University of Cologne

Astronomy and Astrophysics

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

Vol. 521 1 L40+- L40

Subject Categories

Astronomy, Astrophysics and Cosmology

Roots

Basic sciences

DOI

10.1051/0004-6361/201015119

More information

Latest update

5/23/2019