Seeds of Life in Space (SOLIS) VI. Chemical evolution of sulfuretted species along the outflows driven by the low-mass protostellar binary NGC1333-IRAS4A
Artikel i vetenskaplig tidskrift, 2020

Context. Low-mass protostars drive powerful molecular outflows that can be observed with millimetre and submillimetre telescopes. Various sulfuretted species are known to be bright in shocks and could be used to infer the physical and chemical conditions throughout the observed outflows. Aims. The evolution of sulfur chemistry is studied along the outflows driven by the NGC1333-IRAS4A protobinary system located in the Perseus cloud to constrain the physical and chemical processes at work in shocks.
Methods. We observed various transitions from OCS, CS, SO, and SO2 towards NGC1333-IRAS4A in the 1.3, 2, and 3mm bands using the IRAM NOrthern Extended Millimeter Array and we interpreted the observations through the use of the Paris-Durham shock model.
Results. The targeted species clearly show different spatial emission along the two outflows driven by IRAS4A. OCS is brighter on small and large scales along the south outflow driven by IRAS4A1, whereas SO2 is detected rather along the outflow driven by IRAS4A2 that is extended along the north east-south west direction. SO is detected at extremely high radial velocity up to +25 km s 1 relative to the source velocity, clearly allowing us to distinguish the two outflows on small scales. Column density ratio maps estimated from a rotational diagram analysis allowed us to confirm a clear gradient of the OCS/SO2 column density ratio between the IRAS4A1 and IRAS4A2 outflows. Analysis assuming non Local Thermodynamic Equilibrium of four SO2 transitions towards several SiO emission peaks suggests that the observed gas should be associated with densities higher than 105 cm 3 and relatively warm (T > 100 K) temperatures in most cases.
Conclusions. The observed chemical differentiation between the two outflows of the IRAS4A system could be explained by a different chemical history. The outflow driven by IRAS4A1 is likely younger and more enriched in species initially formed in interstellar ices, such as OCS, and recently sputtered into the shock gas. In contrast, the longer and likely older outflow triggered by IRAS4A2 is more enriched in species that have a gas phase origin, such as SO2.

ISM: molecules

stars: formation

astrochemistry

ISM: individual objects: NGC1333-IRAS4A

ISM: jets and outflows

ISM: abundances

Författare

V Taquet

Istituto nazionale di astrofisica (INAF)

C. Codella

Istituto nazionale di astrofisica (INAF)

Université Grenoble Alpes

M. De Simone

Université Grenoble Alpes

A. Lopez-Sepulcre

Institut de Radioastronomie Millimétrique (IRAM)

Université Grenoble Alpes

J. E. Pineda

Max-Planck-Gesellschaft

D. Segura-Cox

Max-Planck-Gesellschaft

C. Ceccarelli

Université Grenoble Alpes

Istituto nazionale di astrofisica (INAF)

P. Caselli

Max-Planck-Gesellschaft

A. Gusdorf

Université Paris Descartes

Sorbonne Université

Magnus V. Persson

Chalmers, Rymd-, geo- och miljövetenskap, Astronomi och plasmafysik, Galaktisk astrofysik

F. Alves

Max-Planck-Gesellschaft

E. Caux

Université de Toulouse

C. Favre

Université Grenoble Alpes

F. Fontani

Istituto nazionale di astrofisica (INAF)

R. Neri

Institut de Radioastronomie Millimétrique (IRAM)

Y. Oya

University of Tokyo

N. Sakai

RIKEN

C. Vastel

Université de Toulouse

S. Yamamoto

University of Tokyo

R. Bachiller

IGN

N. Balucani

Université Grenoble Alpes

Istituto nazionale di astrofisica (INAF)

Dipartimento Chim Biol & Biotecnol

E. Bianchi

Université Grenoble Alpes

L. Bizzocchi

Max-Planck-Gesellschaft

A. Chacon-Tanarro

IGN

F. Dulieu

Université Pierre et Marie Curie (UPMC)

J. Enrique-Romero

Université Grenoble Alpes

S. Feng

National Astronomical Observatory China

Chinese Academy of Sciences

J. Holdship

University College London (UCL)

B. Lefloch

Université Grenoble Alpes

A. Jaber Al-Edhari

Univ AL Muthanna

Université Grenoble Alpes

I Jimenez-Serra

Consejo Superior de Investigaciones Científicas (CSIC)

C. Kahane

Université Grenoble Alpes

V Lattanzi

Max-Planck-Gesellschaft

J. Ospina-Zamudio

Université Grenoble Alpes

L. Podio

Istituto nazionale di astrofisica (INAF)

A. Punanova

Ural Federal University

A. Rimola

Universitat Autonoma de Barcelona (UAB)

I. R. Sims

Université de Rennes 1

S. Spezzano

Max-Planck-Gesellschaft

L. Testi

ESO

Istituto nazionale di astrofisica (INAF)

P. Theule

Aix-Marseille Université

P. Ugliengo

Universita degli Studi di Torino

Vasyunin

Ural Federal University

Ventspils Univ Appl Sci

F. Vazart

Université Grenoble Alpes

S. Viti

University College London (UCL)

A. Witzel

Université Grenoble Alpes

Astronomy and Astrophysics

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

Vol. 637 A63

Ämneskategorier

Astronomi, astrofysik och kosmologi

Atom- och molekylfysik och optik

Geofysik

DOI

10.1051/0004-6361/201937072

Mer information

Senast uppdaterat

2020-07-01