Detection of OH+ and H2O+ towards Orion KL
Artikel i vetenskaplig tidskrift, 2010

We report observations of the reactive molecular ions OH^+, H_2O^+, and H_3O^+ towards Orion KL with Herschel/HIFI. All three N = 1-0 fine-structure transitions of OH^+ at 909, 971, and 1033 GHz and both fine-structure components of the doublet ortho-H_2O^+ 1_11-0_00 transition at 1115 and 1139 GHz were detected; an upper limit was obtained for H_3O^+. OH^+ and H_2O^+ are observed purely in absorption, showing a narrow component at the source velocity of 9 km s^-1, and a broad blueshifted absorption similar to that reported recently for HF and para-H_2^18O, and attributed to the low velocity outflow of Orion KL. We estimate column densities of OH^+ and H_2O^+ for the 9 km s^-1 component of 9 \plusmn 3 \times 10^12 cm^-2 and 7 \plusmn 2 \times 10^12 cm^-2, and those in the outflow of 1.9 \plusmn 0.7 \times 10^13 cm^-2 and 1.0 \plusmn 0.3 \times 10^13 cm^-2. Upper limits of 2.4 \times 10^12 cm^-2 and 8.7 \times 10^12 cm^-2 were derived for the column densities of ortho and para-H_3O^+ from transitions near 985 and 1657 GHz. The column densities of the three ions are up to an order of magnitude lower than those obtained from recent observations of W31C and W49N. The comparatively low column densities may be explained by a higher gas density despite the assumption of a very high ionization rate.

Författare

H. Gupta

Jet Propulsion Laboratory, California Institute of Technology

P. B. Rimmer

Ohio State University

J. C. Pearson

Jet Propulsion Laboratory, California Institute of Technology

S. Yu

Jet Propulsion Laboratory, California Institute of Technology

E. Herbst

Ohio State University

N. Harada

Ohio State University

E. A. Bergin

University of Michigan

D. A. Neufeld

Johns Hopkins University

G. J. Melnick

Harvard-Smithsonian Center for Astrophysics

R. Bachiller

Centro Astronomico de Yebes

W. Baechtold

Eidgenössische Technische Hochschule Zürich (ETH)

T. A. Bell

CalTech

G. A. Blake

CalTech

E. Caux

Université de Toulouse

LUTH - Laboratoire de l'Univers et de ses Theories

C. Ceccarelli

Laboratoire d'Astrophysique de l'Observatoire de Grenoble

J. Cernicharo

Centro de Astrobiologia (CAB)

Goutam Chattopadhyay

Jet Propulsion Laboratory, California Institute of Technology

C. Comito

Max Planck-institutet

S. Cabrit

LUTH - Laboratoire de l'Univers et de ses Theories

N. R. Crockett

University of Michigan

F. Daniel

Centro de Astrobiologia (CAB)

LUTH - Laboratoire de l'Univers et de ses Theories

E. Falgarone

LUTH - Laboratoire de l'Univers et de ses Theories

M. C. Diez-Gonzalez

Centro Astronomico de Yebes

M.-L. Dubernet

LUTH - Laboratoire de l'Univers et de ses Theories

N. Erickson

University of Massachusetts

M. Emprechtinger

CalTech

P. Encrenaz

LUTH - Laboratoire de l'Univers et de ses Theories

M. Gerin

LUTH - Laboratoire de l'Univers et de ses Theories

John Gill

Jet Propulsion Laboratory, California Institute of Technology

T. F. Giesen

Universität zu Köln

J. R. Goicoechea

Centro de Astrobiologia (CAB)

P. F. Goldsmith

Jet Propulsion Laboratory, California Institute of Technology

C. Joblin

Université de Toulouse

LUTH - Laboratoire de l'Univers et de ses Theories

D. Johnstone

National Research Council Canada

W. D. Langer

Jet Propulsion Laboratory, California Institute of Technology

B. Larsson

Stockholms universitet

W. B. Latter

CalTech

Robert Lin

Jet Propulsion Laboratory, California Institute of Technology

D. C. Lis

CalTech

René Liseau

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

S. D. Lord

CalTech

F. W. Maiwald

Jet Propulsion Laboratory, California Institute of Technology

S. Maret

Laboratoire d'Astrophysique de l'Observatoire de Grenoble

P. G. Martin

Canadian Institute for Theoretical Astrophysics

J. Martin-Pintado

Centro de Astrobiologia (CAB)

K. M. Menten

Max Planck-institutet

P. Morris

CalTech

H. S. P. Müller

Universität zu Köln

J. A. Murphy

Maynooth University

L. H. Nordh

Stockholms universitet

Michael Olberg

Chalmers, Institutionen för radio- och rymdvetenskap, Nationella anläggningen för radioastronomi

V. Ossenkopf

Universität zu Köln

Netherlands Institute for Space Research (SRON)

L. Pagani

LUTH - Laboratoire de l'Univers et de ses Theories

M. Pérault

LUTH - Laboratoire de l'Univers et de ses Theories

T. G. Phillips

CalTech

R. Plume

University of Calgary

S.-L. Qin

Universität zu Köln

M. Salez

LUTH - Laboratoire de l'Univers et de ses Theories

A. Samoska

Jet Propulsion Laboratory, California Institute of Technology

P. Schilke

Max Planck-institutet

Universität zu Köln

Erich Schlecht

Jet Propulsion Laboratory, California Institute of Technology

S. Schlemmer

Universität zu Köln

R. Szczerba

Nicolaus Copernicus Astronomical Center of the Polish Academy of Sciences

J. Stutzki

Universität zu Köln

N. Trappe

Maynooth University

F. F. S. van der Tak

Netherlands Institute for Space Research (SRON)

C. Vastel

LUTH - Laboratoire de l'Univers et de ses Theories

Université de Toulouse

S. Wang

University of Michigan

H. W. Yorke

Jet Propulsion Laboratory, California Institute of Technology

J. Zmuidzinas

CalTech

A. Boogert

CalTech

R. Güsten

Max Planck-institutet

P. Hartogh

MPI für Sonnensystemforschung

N. Honingh

National Research Council Canada

A. Karpov

CalTech

J. Kooi

CalTech

J.-M. Krieg

Centro de Astrobiologia (CAB)

R. Schieder

Universität zu Köln

P. Zaal

Netherlands Institute for Space Research (SRON)

Astronomy and Astrophysics

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

Vol. 521 1 L47+- L47

Ämneskategorier

Astronomi, astrofysik och kosmologi

Fundament

Grundläggande vetenskaper

DOI

10.1051/0004-6361/201015117

Mer information

Senast uppdaterat

2018-09-06