Herschel/HIFI spectroscopy of the intermediate mass protostar NGC 7129 FIRS 2
Artikel i vetenskaplig tidskrift, 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.
Författare
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
Universiteit Leiden
Harvard-Smithsonian Center for Astrophysics
A. Fuente
Observatorio Astronómico Nacional (OAN)
L. Kristensen
Universiteit Leiden
J. Cernicharo
Centro de Astrobiologia (CAB)
P. Caselli
Osservatorio Astrofisico di Arcetri
University of Leeds
R. Visser
Universiteit Leiden
R. Plume
University of Calgary
G. J. Herczeg
Max-Planck-Gesellschaft
E. F. van Dishoeck
Universiteit Leiden
Max-Planck-Gesellschaft
S. F. Wampfler
Eidgenössische Technische Hochschule Zürich (ETH)
R. Bachiller
Observatorio Astronómico Nacional (OAN)
A. Baudry
Eidgenössische Technische Hochschule Zürich (ETH)
M. Benedettini
University of Michigan
Universita degli Studi di Roma Tor Vergata
E. A. Bergin
University of Michigan
A. O. Benz
Eidgenössische Technische Hochschule Zürich (ETH)
Per Bjerkeli
Chalmers, Institutionen för radio- och rymdvetenskap, 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
Universita degli Studi di Roma 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
Universita degli Studi di Roma 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
Universita degli Studi di Roma Tor Vergata
J. R. Goicoechea
Osservatorio Astrofisico di Arcetri
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
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, Institutionen för radio- och rymdvetenskap, Radioastronomi och astrofysik
M. Marseille
Netherlands Institute for Space Research (SRON)
G. J. Melnick
Harvard-Smithsonian Center for Astrophysics
D. A. Neufeld
Johns Hopkins University
B. Nisini
Universita degli Studi di Roma Tor Vergata
Michael Olberg
Chalmers, Institutionen för radio- och rymdvetenskap, Nationella anläggningen för radioastronomi
B. Parise
Max-Planck-Gesellschaft
Universität zu Köln
J. C. Pearson
Jet Propulsion Laboratory, California Institute of Technology
C. Risacher
Netherlands Institute for Space Research (SRON)
J. Santiago-García
Observatorio Astronómico Nacional (OAN)
P. Saraceno
Universita degli Studi di Roma Tor Vergata
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)
F. Wyrowski
Max-Planck-Gesellschaft
U. A. Yildiz
Universiteit Leiden
E. Caux
Rijksuniversiteit Groningen
N. Honingh
Universität zu Köln
W. Jellema
Netherlands Institute for Space Research (SRON)
R. Schieder
Universität zu Köln
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+- L41Ämneskategorier
Astronomi, astrofysik och kosmologi
Fundament
Grundläggande vetenskaper
DOI
10.1051/0004-6361/201015122