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.
stars: formation
astrochemistry
ISM: jets and outflows
ISM: molecules
Author
U. A. Yildiz
Leiden University
E. F. van Dishoeck
Max Planck Society
Leiden University
L. Kristensen
Leiden University
R. Visser
Leiden University
J. K. Jorgensen
University of Copenhagen
G. J. Herczeg
Max Planck Society
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
University of Leeds
Arcetri Astrophysical Observatory
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
Anton Pannekoek Institute for Astronomy
Radboud University
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 Society
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 Society
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
Institut de Radioastronomie Millimétrique (IRAM)
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 Society
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+- L40Subject Categories
Astronomy, Astrophysics and Cosmology
Roots
Basic sciences
DOI
10.1051/0004-6361/201015119