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 Institute

E. F. van Dishoeck

Leiden University

Max Planck Institute

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 Institute

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 Institute

U. A. Yildiz

Leiden University

Astronomy and Astrophysics

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

Vol. 518 Article Number: L86 L86

Subject Categories

Astronomy, Astrophysics and Cosmology

DOI

10.1051/0004-6361/201014672

More information

Latest update

5/23/2019