Herschel/HIFI detections of hydrides towards AFGL 2591 Envelope emission versus tenuous cloud absorption
Artikel i vetenskaplig tidskrift, 2010

The Heterodyne Instrument for the Far Infrared (HIFI) onboard the Herschel Space Observatory allows the first observations of light diatomic molecules at high spectral resolution and in multiple transitions. Here, we report deep integrations using HIFI in different lines of hydrides towards the high-mass star forming region AFGL 2591. Detected are CH, CH+, NH, OH+, H2O+, while NH+ and SH+ have not been detected. All molecules except for CH and CH+ are seen in absorption with low excitation temperatures and at velocities different from the systemic velocity of the protostellar envelope. Surprisingly, the CH(J(F,P) = 3/2(2),(-) - 1/2(1,+)) and CH+(J = 1-0, J = 2-1) lines are detected in emission at the systemic velocity. We can assign the absorption features to a foreground cloud and an outflow lobe, while the CH and CH+ emission stems from the envelope. The observed abundance and excitation of CH and CH+ can be explained in the scenario of FUV irradiated outflow walls, where a cavity etched out by the outflow allows protostellar FUV photons to irradiate and heat the envelope at larger distances driving the chemical reactions that produce these molecules.

ISM: individual objects: AFGL 2591

ISM: molecules

stars: formation

astrochemistry

Författare

S. Bruderer

Eidgenössische Technische Hochschule Zürich (ETH)

A. O. Benz

Fachhochschule Nordwestschweiz

E. F. van Dishoeck

Universiteit Leiden

M. Melchior

Fachhochschule Nordwestschweiz

S. Doty

Denison University

F. F. S. van der Tak

Rijksuniversiteit Groningen

P. Stauber

Eidgenössische Technische Hochschule Zürich (ETH)

S. F. Wampfler

Universität Bern

C. Dedes

Eidgenössische Technische Hochschule Zürich (ETH)

U. A. Yildiz

Jet Propulsion Laboratory, California Institute of Technology

L. Pagani

Sorbonne Université

T. Giannini

Osservatorio Astronomico di Roma

T. de Graauw

Universiteit Leiden

N. Whyborn

Cherenkov Telescope Array

D. Teyssier

Europeiska rymdorganisationen (ESA)

W. Jellema

Netherlands Institute for Space Research (SRON)

R. Shipman

Netherlands Institute for Space Research (SRON)

R. Schieder

Universität zu Köln

N. Honingh

Universität zu Köln

E. Caux

Universite Paul Sabatier Toulouse III

W. Bachtold

Eidgenössische Technische Hochschule Zürich (ETH)

A. Csillaghy

Fachhochschule Nordwestschweiz

C. Monstein

Istituto Ricerche Solari Locarno

R. Bachiller

Observatorio Astronómico Nacional (OAN)

A. Baudry

Université de Bordeaux

M. Benedettini

Istituto nazionale di astrofisica (INAF)

E. A. Bergin

University of Michigan

Per Bjerkeli

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

G. A. Blake

California Institute of Technology (Caltech)

S. Bontemps

Université de Bordeaux

J. Braine

Université de Bordeaux

P. Caselli

Max-Planck-Institut für extraterrestrische Physik

J. Cernicharo

CSIC - Instituto de Fisica Fundamental (IFF)

C. Codella

Osservatorio Astrofisico di Arcetri

F. Daniel

Université Grenoble Alpes

A. M. di Giorgio

Istituto nazionale di astrofisica (INAF)

C. Dominik

Sterrenkundig Instituut Anton Pannekoek

P. Encrenaz

Observatoire de Paris

M. Fich

University of Waterloo

A. Fuente

Observatorio Astronómico Nacional (OAN)

J. R. Goicoechea

CSIC - Instituto de Fisica Fundamental (IFF)

F. Helmich

Rijksuniversiteit Groningen

G. J. Herczeg

Peking University

F. Herpin

Université de Bordeaux

M. R. Hogerheijde

Universiteit Van Amsterdam

T. Jacq

Université de Bordeaux

D. Johnstone

University of Victoria

J. K. Jorgensen

Köpenhamns universitet

L. Kristensen

Niels Bohr Institute

B. Larsson

Stockholms universitet

D. Lis

Jet Propulsion Laboratory, California Institute of Technology

René Liseau

Chalmers, Rymd- och geovetenskap, Radioastronomi och astrofysik

M. Marseille

Centre National d'Etudes Spatiales (CNES)

C. McCoey

University of Waterloo

G. J. Melnick

Harvard-Smithsonian Center for Astrophysics

D. A. Neufeld

Johns Hopkins University

B. Nisini

Osservatorio Astronomico di Roma

Michael Olberg

Chalmers, Rymd- och geovetenskap, Onsala rymdobservatorium

B. Parise

Max-Planck Institut für Radioastronomie

J. C. Pearson

Jet Propulsion Laboratory, California Institute of Technology

R. Plume

University of Calgary

C. Risacher

Institut de Radioastronomie Millimétrique (IRAM)

J. Santiago-García

Instituto de Radioastronomía Milimétrica

P. Saraceno

Istituto nazionale di astrofisica (INAF)

M. Tafalla

Observatorio Astronómico Nacional (OAN)

T. A. van Kempen

Netherlands Institute for Space Research (SRON)

R. Visser

European Southern Observatory (ESO)

F. Wyrowski

Max-Planck Institut für Radioastronomie

Astronomy and Astrophysics

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

Vol. 521 1 L44

Ämneskategorier

Astronomi, astrofysik och kosmologi

DOI

10.1051/0004-6361/201015098

Mer information

Senast uppdaterat

2021-07-08