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

Western University

University of Waterloo

T. A. van Kempen

Universiteit Leiden

Harvard-Smithsonian Center for Astrophysics

A. Fuente

Observatorio Astronamico Nacional (OAN-IGN)

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-institutet

E. F. van Dishoeck

Universiteit Leiden

Max Planck-institutet

S. F. Wampfler

Eidgenössische Technische Hochschule Zürich (ETH)

R. Bachiller

Observatorio Astronamico Nacional (OAN-IGN)

A. Baudry

Eidgenössische Technische Hochschule Zürich (ETH)

M. Benedettini

Universita degli Studi di Roma Tor Vergata

University of Michigan

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

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

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

Köbenhavns Universitet

B. Larsson

Stockholms universitet

D. Lis

Caltech Division of Geological and Planetary Sciences

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

Universität zu Köln

Max Planck-institutet

J. C. Pearson

Jet Propulsion Laboratory, California Institute of Technology

C. Risacher

Netherlands Institute for Space Research (SRON)

J. Santiago-García

Observatorio Astronamico Nacional (OAN-IGN)

P. Saraceno

Universita degli Studi di Roma Tor Vergata

R. Shipman

Netherlands Institute for Space Research (SRON)

M. Tafalla

Observatorio Astronamico Nacional (OAN-IGN)

F. F. S. van der Tak

Netherlands Institute for Space Research (SRON)

Rijksuniversiteit Groningen

F. Wyrowski

Max Planck-institutet

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 (ESA)

N. Whyborn

Atacama Large Millimeter-submillimeter Array (ALMA)

Astronomy and Astrophysics

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

Vol. 521 1 L41+- L41

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

DOI

10.1051/0004-6361/201015122