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.

astrochemistry

ISM: jets and outflows

stars: formation

ISM: molecules

Författare

U. A. Yildiz

Leiden Observatory Research Institute

E. F. van Dishoeck

Max Planck Institut fur extraterrestrische Physik

Leiden Observatory Research Institute

L. Kristensen

Leiden Observatory Research Institute

R. Visser

Leiden Observatory Research Institute

J. K. Jorgensen

Kobenhavns Universitet

G. J. Herczeg

Max Planck Institut fur extraterrestrische Physik

T. A. van Kempen

Leiden Observatory Research Institute

Harvard-Smithsonian Center for Astrophysics

M. R. Hogerheijde

Leiden Observatory Research Institute

S. Doty

Denison University

A. O. Benz

ETH Zurich

S. Bruderer

ETH Zurich

S. F. Wampfler

ETH Zurich

E. Deul

Leiden Observatory Research Institute

R. Bachiller

Observatorio Astronomico Nacional

A. Baudry

Laboratoire d'Astrophysique de Bordeaux

M. Benedettini

Universita degli Studi di Roma Tor Vergata

E. A. Bergin

University Michigan Ann Arbor

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

Osservatorio Astrofisico Di Arcetri

University of Leeds

J. Cernicharo

CSIC-INTA - Centro de Astrobiologia (CAB)

C. Codella

Osservatorio Astrofisico Di Arcetri

F. Daniel

CSIC-INTA - Centro de Astrobiologia (CAB)

A. M. di Giorgio

Universita degli Studi di Roma Tor Vergata

C. Dominik

Radboud University Nijmegen

Astronomical Institute Anton Pannekoek

P. Encrenaz

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

M. Fich

University of Waterloo

A. Fuente

Observatorio Astronomico Nacional

T. Giannini

Osservatorio Astronomico di Roma

J. R. Goicoechea

CSIC-INTA - Centro de Astrobiologia (CAB)

T. de Graauw

SRON Netherlands Institute for Space Research

F. Helmich

SRON Netherlands Institute for Space Research

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

California Institute of Technology

René Liseau

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

F.-C. Liu

Max Planck Institut fur Radioastronomie

M. Marseille

SRON Netherlands Institute for Space Research

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 Institut fur Radioastronomie

J. C. Pearson

Jet Propulsion Laboratory, California Institute of Technology

R. Plume

University of Calgary

C. Risacher

SRON Netherlands Institute for Space Research

J. Santiago-García

Instituto de Radioastronomia Milimetrica

P. Saraceno

Universita degli Studi di Roma Tor Vergata

R. Shipman

SRON Netherlands Institute for Space Research

M. Tafalla

Observatorio Astronomico Nacional

Aggm Tielens

Leiden Observatory Research Institute

F. F. S. van der Tak

SRON Netherlands Institute for Space Research

University of Groningen, Kapteyn Astronomical Institute

F. Wyrowski

Max Planck Institut fur Radioastronomie

P. Dieleman

SRON Netherlands Institute for Space Research

W. Jellema

SRON Netherlands Institute for Space Research

V. Ossenkopf

Universitat zu Koln

R. Schieder

Universitat zu Koln

J. Stutzki

Universitat zu Koln

Astronomy and Astrophysics

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

Vol. 521 L40+- L40

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

DOI

10.1051/0004-6361/201015119