Herschel/HIFI observations of high-J CO lines in the NGC 1333 low-mass star-forming region
Artikel i vetenskaplig tidskrift, 2010

Herschel/HIFI observations of high-J lines (up to J_u = 10) of ^12CO, ^13CO and C^18O are presented toward three deeply embedded low-mass protostars, NGC 1333 IRAS 2A, IRAS 4A, and IRAS 4B, obtained as part of the Water In Star-forming regions with Herschel (WISH) key program. The spectrally-resolved HIFI data are complemented by ground-based observations of lower-J CO and isotopologue lines. The ^12CO 10-9 profiles are dominated by broad (FWHM 25-30 km s^-1) emission. Radiative transfer models are used to constrain the temperature of this shocked gas to 100-200 K. Several CO and ^13CO line profiles also reveal a medium-broad component (FWHM5-10 km s^-1), seen prominently in H_2O lines. Column densities for both components are presented, providing a reference for determining abundances of other molecules in the same gas. The narrow C^18O 9-8 lines probe the warmer part of the quiescent envelope. Their intensities require a jump in the CO abundance at an evaporation temperature around 25 K, thus providing new direct evidence for a CO ice evaporation zone around low-mass protostars.

stars: formation

ISM: molecules

ISM: jets and outflows

astrochemistry

Författare

U. A. Yildiz

Universiteit Leiden

E. F. van Dishoeck

Universiteit Leiden

Max Planck-institutet

L. Kristensen

Universiteit Leiden

R. Visser

Universiteit Leiden

J. K. Jorgensen

Köbenhavns Universitet

G. J. Herczeg

Max Planck-institutet

T. A. van Kempen

Universiteit Leiden

Harvard-Smithsonian Center for Astrophysics

M. R. Hogerheijde

Universiteit Leiden

S. Doty

Denison University

A. O. Benz

Eidgenössische Technische Hochschule Zürich (ETH)

S. Bruderer

Eidgenössische Technische Hochschule Zürich (ETH)

S. F. Wampfler

Eidgenössische Technische Hochschule Zürich (ETH)

E. Deul

Universiteit Leiden

R. Bachiller

Observatorio Astronamico Nacional (OAN-IGN)

A. Baudry

Laboratoire d'Astrophysique de Bordeaux

M. Benedettini

Universita degli Studi di Roma Tor Vergata

E. A. Bergin

University of Michigan

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

P. Caselli

University of Leeds

Osservatorio Astrofisico di Arcetri

J. Cernicharo

Centro de Astrobiologia (CAB)

C. Codella

Osservatorio Astrofisico di Arcetri

F. Daniel

Centro de Astrobiologia (CAB)

A. M. di Giorgio

Universita degli Studi di Roma Tor Vergata

C. Dominik

Anton Pannekoek Institute for Astronomy

Radboud Universiteit

P. Encrenaz

LERMA - Laboratoire d'Etudes du Rayonnement et de la Matiere en Astrophysique et Atmospheres

M. Fich

University of Waterloo

A. Fuente

Observatorio Astronamico Nacional (OAN-IGN)

T. Giannini

Osservatorio Astronomico di Roma

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

T. Jacq

Laboratoire d'Astrophysique de Bordeaux

D. Johnstone

National Research Council Canada

University of Victoria

B. Larsson

Stockholms universitet

D. Lis

CalTech

René Liseau

Chalmers, Institutionen för radio- och rymdvetenskap, Radioastronomi och astrofysik

F.-C. Liu

Max Planck-institutet

M. Marseille

Netherlands Institute for Space Research (SRON)

C. McCoey

University of Waterloo

Western University

G. J. Melnick

Harvard-Smithsonian Center for Astrophysics

D. A. Neufeld

Johns Hopkins University

B. Nisini

Osservatorio Astronomico di Roma

Michael Olberg

Chalmers, Institutionen för radio- och rymdvetenskap, Radioastronomi och astrofysik

B. Parise

Max Planck-institutet

J. C. Pearson

Jet Propulsion Laboratory, California Institute of Technology

R. Plume

University of Calgary

C. Risacher

Netherlands Institute for Space Research (SRON)

J. Santiago-García

Instituto de Radioastronomia Milimetrica

P. Saraceno

Universita degli Studi di Roma Tor Vergata

R. Shipman

Netherlands Institute for Space Research (SRON)

M. Tafalla

Observatorio Astronamico Nacional (OAN-IGN)

Aggm Tielens

Universiteit Leiden

F. F. S. van der Tak

Rijksuniversiteit Groningen

Netherlands Institute for Space Research (SRON)

F. Wyrowski

Max Planck-institutet

P. Dieleman

Netherlands Institute for Space Research (SRON)

W. Jellema

Netherlands Institute for Space Research (SRON)

V. Ossenkopf

Universität zu Köln

R. Schieder

Universität zu Köln

J. Stutzki

Universität zu Köln

Astronomy and Astrophysics

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

Vol. 521 1 L40+- L40

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

DOI

10.1051/0004-6361/201015119

Mer information

Senast uppdaterat

2018-09-06