Gas kinematics around filamentary structures in the Orion B cloud
Artikel i vetenskaplig tidskrift, 2023

Context. Understanding the initial properties of star-forming material and how they affect the star formation process is key. From an observational point of view, the feedback from young high-mass stars on future star formation properties is still poorly constrained. Aims. In the framework of the IRAM 30m ORION-B large program, we obtained observations of the translucent (2 ≤ AV < 6 mag) and moderately dense gas (6 ≤ AV < 15 mag), which we used to analyze the kinematics over a field of 5 deg2 around the filamentary structures. Methods. We used the Regularized Optimization for Hyper-Spectral Analysis (ROHSA) algorithm to decompose and de-noise the C 18 O(1−0) and 13CO(1−0) signals by taking the spatial coherence of the emission into account. We produced gas column density and mean velocity maps to estimate the relative orientation of their spatial gradients. Results. We identified three cloud velocity layers at different systemic velocities and extracted the filaments in each velocity layer. The filaments are preferentially located in regions of low centroid velocity gradients. By comparing the relative orientation between the column density and velocity gradients of each layer from the ORION-B observations and synthetic observations from 3D kinematic toy models, we distinguish two types of behavior in the dynamics around filaments: (i) radial flows perpendicular to the filament axis that can be either inflows (increasing the filament mass) or outflows and (ii) longitudinal flows along the filament axis. The former case is seen in the Orion B data, while the latter is not identified. We have also identified asymmetrical flow patterns, usually associated with filaments located at the edge of an H II region. Conclusions. This is the first observational study to highlight feedback from H II regions on filament formation and, thus, on star formation in the Orion B cloud. This simple statistical method can be used for any molecular cloud to obtain coherent information on the kinematics.

ISM: individual objects: Orion B

ISM: kinematics and dynamics

Radio lines: ISM

HII regions

Stars: formation

ISM: clouds


Mathilde Gaudel

Observatoire de Paris

Jan Orkisz

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

M. Gerin

Observatoire de Paris

J. Pety

Institut de Radioastronomie Millimétrique (IRAM)

Observatoire de Paris

Antoine Roueff

Institut Fresnel

Antoine Marchal

Institut canadien d'astrophysique théorique

F. Levrier

Laboratoire de Physique de l’Ecole Normale Supérieure

Marc Antoine Miville-Deschênes

Université Paris-Saclay

Javier R. Goicoechea

CSIC - Instituto de Fisica Fundamental (IFF)

Evelyne Roueff

Observatoire de Paris

Franck Le Petit

Observatoire de Paris

Victor De Souza Magalhaes

Institut de Radioastronomie Millimétrique (IRAM)

Pierre Palud

Observatoire de Paris

Miriam G. Santa-Maria

CSIC - Instituto de Fisica Fundamental (IFF)

Maxime Vono

Université de Toulouse

Sébastien Bardeau

Institut de Radioastronomie Millimétrique (IRAM)

E. Bron

Observatoire de Paris

Pierre Chainais

Université de Lille

Jocelyn Chanussot

Université Grenoble Alpes

P. Gratier

Laboratoire d'Astrophysique de Bordeaux

Viviana Guzman

Pontificia Universidad Catolica de Chile

Annie Hughes

Institut de Recherche en Astrophysique et Planétologie (IRAP)

Jouni Kainulainen

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

David Languignon

Observatoire de Paris

Jacques Le Bourlot

Université Paris Descartes

Observatoire de Paris

Harvey Liszt

National Radio Astronomy Observatory

K. I. Öberg

Harvard-Smithsonian Center for Astrophysics

Nicolas Peretto

Cardiff University

Albrecht Sievers

Institut de Radioastronomie Millimétrique (IRAM)

P., Tremblin

Maison de la Simulation

Astronomy and Astrophysics

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

Vol. 670 A59

Turbulensdiagnostik i molekylmolnen i solens närhet

Vetenskapsrådet (VR) (2017-03864), 2018-01-01 -- 2020-12-31.


Meteorologi och atmosfärforskning

Astronomi, astrofysik och kosmologi

Strömningsmekanik och akustik



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