Herschel/HIFI spectroscopy of the intermediate mass protostar NGC 7129 FIRS 2
Journal article, 2010
Herschel/HIFI observations of water from the intermediate mass protostar NGC 7129 FIRS 2 provide a powerful diagnostic of the physical conditions in this star formation environment. Six spectral settings, covering four H_2^16O and two H_2^18O lines, were observed and all but one H_2^18O line were detected. The four H_2^16O lines discussed here share a similar morphology: a narrower, \ap6 km s^-1, component centered slightly redward of the systemic velocity of NGC 7129 FIRS 2 and a much broader, \ap25 km s^-1 component centered blueward and likely associated with powerful outflows. The narrower components are consistent with emission from water arising in the envelope around the intermediate mass protostar, and the abundance of H_2O is constrained to \ap10^-7 for the outer envelope. Additionally, the presence of a narrow self-absorption component for the lowest energy lines is likely due to self-absorption from colder water in the outer envelope. The broader component, where the H_2O/CO relative abundance is found to be \ap0.2, appears to be tracing the same energetic region that produces strong CO emission at high J.
Author
D. Johnstone
National Research Council Canada
University of Victoria
M. Fich
University of Waterloo
C. McCoey
University of Waterloo
Western University
T. A. van Kempen
Leiden University
Harvard-Smithsonian Center for Astrophysics
A. Fuente
Spanish National Observatory (OAN)
L. Kristensen
Leiden University
J. Cernicharo
Centro de Astrobiologia (CAB)
P. Caselli
Arcetri Astrophysical Observatory
University of Leeds
R. Visser
Leiden University
R. Plume
University of Calgary
G. J. Herczeg
Max Planck Society
E. F. van Dishoeck
Leiden University
Max Planck Society
S. F. Wampfler
Swiss Federal Institute of Technology in Zürich (ETH)
R. Bachiller
Spanish National Observatory (OAN)
A. Baudry
Swiss Federal Institute of Technology in Zürich (ETH)
M. Benedettini
University of Michigan
University of Rome Tor Vergata
E. A. Bergin
University of Michigan
A. O. Benz
Swiss Federal Institute of Technology in Zürich (ETH)
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
S. Bruderer
Swiss Federal Institute of Technology in Zürich (ETH)
C. Codella
University of Rome Tor Vergata
F. Daniel
Agencia Estatal Consejo Superior de Investigaciones Científicas (CSIC)
LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres
A. M. di Giorgio
University of Rome Tor Vergata
C. Dominik
Anton Pannekoek Institute for Astronomy
S. Doty
Denison University
P. Encrenaz
LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres
T. Giannini
University of Rome Tor Vergata
J. R. Goicoechea
Arcetri Astrophysical Observatory
T. de Graauw
Atacama Large Millimeter-submillimeter Array (ALMA)
F. Helmich
Netherlands Institute for Space Research (SRON)
F. Herpin
Laboratoire d'Astrophysique de Bordeaux
M. R. Hogerheijde
Leiden University
T. Jacq
Laboratoire d'Astrophysique de Bordeaux
J. K. Jorgensen
University of Copenhagen
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)
G. J. Melnick
Harvard-Smithsonian Center for Astrophysics
D. A. Neufeld
Johns Hopkins University
B. Nisini
University of Rome Tor Vergata
Michael Olberg
Chalmers, Department of Radio and Space Science, National Facility for Radio Astronomy
B. Parise
Max Planck Society
University of Cologne
J. C. Pearson
Jet Propulsion Laboratory, California Institute of Technology
C. Risacher
Netherlands Institute for Space Research (SRON)
J. Santiago-García
Spanish National Observatory (OAN)
P. Saraceno
University of Rome Tor Vergata
R. Shipman
Netherlands Institute for Space Research (SRON)
M. Tafalla
Spanish National Observatory (OAN)
F. F. S. van der Tak
University of Groningen
Netherlands Institute for Space Research (SRON)
F. Wyrowski
Max Planck Society
U. A. Yildiz
Leiden University
E. Caux
University of Groningen
N. Honingh
University of Cologne
W. Jellema
Netherlands Institute for Space Research (SRON)
R. Schieder
University of Cologne
D. Teyssier
European Space Astronomy Centre (ESAC)
N. Whyborn
Atacama Large Millimeter-submillimeter Array (ALMA)
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 521 1 L41+- L41Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
Roots
Basic sciences
DOI
10.1051/0004-6361/201015122