Herschel-PACS spectroscopy of the intermediate mass protostar NGC 7129 FIRS 2
Artikel i vetenskaplig tidskrift, 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.
evolution
star-formation
regions
young stellar objects
ISM: molecules
outflow
stars: formation
i.
Författare
M. Fich
University of Waterloo
D. Johnstone
University of Victoria
National Research Council Canada
T. A. van Kempen
Universiteit Leiden
Harvard-Smithsonian Center for Astrophysics
C. McCoey
University of Waterloo
Western University
A. Fuente
Observatorio Astronómico Nacional (OAN)
P. Caselli
University of Leeds
Osservatorio Astrofisico di Arcetri
L. Kristensen
University of Victoria
R. Plume
University of Calgary
J. Cernicharo
Centro de Astrobiologia (CAB)
G. J. Herczeg
Max-Planck-Gesellschaft
E. F. van Dishoeck
Universiteit Leiden
Max-Planck-Gesellschaft
S. F. Wampfler
Eidgenössische Technische Hochschule Zürich (ETH)
P. Gaufre
Laboratoire d'Astrophysique de Bordeaux
John Gill
California Institute of Technology (Caltech)
H. Javadi
California Institute of Technology (Caltech)
M. Justen
Universität zu Köln
W. Laauwen
Netherlands Institute for Space Research (SRON)
W. Luinge
Netherlands Institute for Space Research (SRON)
V. Ossenkopf
Universität zu Köln
J. C. Pearson
California Institute of Technology (Caltech)
R. Bachiller
Observatorio Astronómico Nacional (OAN)
A. Baudry
Laboratoire d'Astrophysique de Bordeaux
M. Benedettini
University of Michigan
Istituto di Fisica dello Spazio Interplanetario, Rome
E. A. Bergin
University of Michigan
A. O. Benz
Eidgenössische Technische Hochschule Zürich (ETH)
Per Bjerkeli
Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik
G. A. Blake
California Institute of Technology (Caltech)
S. Bontemps
Laboratoire d'Astrophysique de Bordeaux
J. Braine
Laboratoire d'Astrophysique de Bordeaux
S. Bruderer
Eidgenössische Technische Hochschule Zürich (ETH)
C. Codella
Istituto di Fisica dello Spazio Interplanetario, Rome
F. Daniel
LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres
Agencia Estatal Consejo Superior de Investigaciones Científicas (CSIC)
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
Universiteit Leiden
T. Jacq
Laboratoire d'Astrophysique de Bordeaux
J. K. Jorgensen
Köpenhamns universitet
B. Larsson
Stockholms universitet
D. Lis
California Institute of Technology (Caltech)
René Liseau
Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik
M. Marseille
Netherlands Institute for Space Research (SRON)
G. J. Melnick
Universiteit Leiden
B. Nisini
Istituto di Fisica dello Spazio Interplanetario, Rome
Michael Olberg
Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium
B. Parise
Max-Planck-Gesellschaft
Universität zu Köln
C. Risacher
Netherlands Institute for Space Research (SRON)
J. Santiago
Observatorio Astronómico Nacional (OAN)
P. Saraceno
Istituto di Fisica dello Spazio Interplanetario, Rome
R. Shipman
Netherlands Institute for Space Research (SRON)
M. Tafalla
Observatorio Astronómico Nacional (OAN)
F. F. S. van der Tak
Rijksuniversiteit Groningen
Netherlands Institute for Space Research (SRON)
R. Visser
Universiteit Leiden
F. Wyrowski
Max-Planck-Gesellschaft
U. A. Yildiz
Universiteit Leiden
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 518 Article Number: L86 L86Ämneskategorier (SSIF 2011)
Astronomi, astrofysik och kosmologi
DOI
10.1051/0004-6361/201014672