Herschel-PACS spectroscopy of the intermediate mass protostar NGC 7129 FIRS 2
Journal article, 2010
Aims. We present preliminary results of the first Herschel spectroscopic observations of NGC 7129 FIRS2, an intermediate mass star-forming region. We attempt to interpret the observations in the framework of an in-falling spherical envelope. Methods. The PACS instrument was used in line spectroscopy mode ( R = 1000-5000) with 15 spectral bands between 63 and 185 mu m. This provided good detections of 26 spectral lines seen in emission, including lines of H2O, CO, OH, O I, and C II. Results. Most of the detected lines, particularly those of H2O and CO, are substantially stronger than predicted by the spherical envelope models, typically by several orders of magnitude. In this paper we focus on what can be learned from the detected CO emission lines. Conclusions. It is unlikely that the much stronger than expected line emission arises in the (spherical) envelope of the YSO. The region hot enough to produce such high excitation lines within such an envelope is too small to produce the amount of emission observed. Virtually all of this high excitation emission must arise in structures such as as along the walls of the outflow cavity with the emission produced by a combination of UV photon heating and/or non-dissociative shocks.
ISM: molecules
evolution
i.
young stellar objects
regions
star-formation
outflow
stars: formation
Author
M. Fich
University of Waterloo
D. Johnstone
University of Victoria
National Research Council Canada
T. A. van Kempen
Harvard-Smithsonian Center for Astrophysics
Leiden University
C. McCoey
Western University
University of Waterloo
A. Fuente
Spanish National Observatory (OAN)
P. Caselli
University of Leeds
Arcetri Astrophysical Observatory
L. Kristensen
University of Victoria
R. Plume
University of Calgary
J. Cernicharo
Centro de Astrobiologia (CAB)
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)
P. Gaufre
Laboratoire d'Astrophysique de Bordeaux
John Gill
Jet Propulsion Laboratory, California Institute of Technology
H. Javadi
Jet Propulsion Laboratory, California Institute of Technology
M. Justen
University of Cologne
W. Laauwen
Netherlands Institute for Space Research (SRON)
W. Luinge
Netherlands Institute for Space Research (SRON)
V. Ossenkopf
University of Cologne
J. C. Pearson
Jet Propulsion Laboratory, California Institute of Technology
R. Bachiller
Spanish National Observatory (OAN)
A. Baudry
Laboratoire d'Astrophysique de Bordeaux
M. Benedettini
Istituto di Fisica dello Spazio Interplanetario, Rome
University of Michigan
E. A. Bergin
University of Michigan
A. O. Benz
Swiss Federal Institute of Technology in Zürich (ETH)
Per Bjerkeli
Chalmers, Earth and Space Sciences, 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
Istituto di Fisica dello Spazio Interplanetario, Rome
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
Istituto di Fisica dello Spazio Interplanetario, Rome
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
Istituto di Fisica dello Spazio Interplanetario, Rome
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
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, Earth and Space Sciences, Radio Astronomy and Astrophysics
M. Marseille
Netherlands Institute for Space Research (SRON)
G. J. Melnick
Leiden University
B. Nisini
Istituto di Fisica dello Spazio Interplanetario, Rome
Michael Olberg
Chalmers, Earth and Space Sciences, Onsala Space Observatory
B. Parise
Max Planck Society
University of Cologne
C. Risacher
Netherlands Institute for Space Research (SRON)
J. Santiago
Spanish National Observatory (OAN)
P. Saraceno
Istituto di Fisica dello Spazio Interplanetario, Rome
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)
R. Visser
Leiden University
F. Wyrowski
Max Planck Society
U. A. Yildiz
Leiden University
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 518 Article Number: L86 L86Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
DOI
10.1051/0004-6361/201014672