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.

stars: formation

outflow

star-formation

regions

ISM: molecules

i.

young stellar objects

evolution

Författare

M. Fich

University of Waterloo

D. Johnstone

National Research Council Canada

University of Victoria

T. A. van Kempen

Universiteit Leiden

Harvard-Smithsonian Center for Astrophysics

C. McCoey

University of Waterloo

Western University

A. Fuente

Observatorio Astronamico Nacional (OAN-IGN)

P. Caselli

Osservatorio Astrofisico di Arcetri

University of Leeds

L. Kristensen

University of Victoria

R. Plume

University of Calgary

J. Cernicharo

Centro de Astrobiologia (CAB)

G. J. Herczeg

Max Planck-institutet

E. F. van Dishoeck

Max Planck-institutet

Universiteit Leiden

S. F. Wampfler

Eidgenössische Technische Hochschule 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

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

Jet Propulsion Laboratory, California Institute of Technology

R. Bachiller

Observatorio Astronamico Nacional (OAN-IGN)

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

Eidgenössische Technische Hochschule Zürich (ETH)

Per Bjerkeli

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

G. A. Blake

Caltech Division of Geological and Planetary Sciences

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

Köbenhavns Universitet

B. Larsson

Stockholms universitet

D. Lis

Caltech Division of Geological and Planetary Sciences

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

Universität zu Köln

Max Planck-institutet

C. Risacher

Netherlands Institute for Space Research (SRON)

J. Santiago

Observatorio Astronamico Nacional (OAN-IGN)

P. Saraceno

Istituto di Fisica dello Spazio Interplanetario, Rome

R. Shipman

Netherlands Institute for Space Research (SRON)

M. Tafalla

Observatorio Astronamico Nacional (OAN-IGN)

F. F. S. van der Tak

Rijksuniversiteit Groningen

Netherlands Institute for Space Research (SRON)

R. Visser

Universiteit Leiden

F. Wyrowski

Max Planck-institutet

U. A. Yildiz

Universiteit Leiden

Astronomy and Astrophysics

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

Vol. 518 Article Number: L86 L86

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.1051/0004-6361/201014672

Mer information

Senast uppdaterat

2018-09-06