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.
HII regions
Stars: formation
Radio lines: ISM
ISM: clouds
ISM: kinematics and dynamics
ISM: individual objects: Orion B
Författare
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
Consejo Superior de Investigaciones Científicas (CSIC)
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
Consejo Superior de Investigaciones Científicas (CSIC)
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
Observatoire de Paris
Université Paris Descartes
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 A59Turbulensdiagnostik i molekylmolnen i solens närhet
Vetenskapsrådet (VR) (2017-03864), 2018-01-01 -- 2020-12-31.
Ämneskategorier (SSIF 2011)
Meteorologi och atmosfärforskning
Astronomi, astrofysik och kosmologi
Strömningsmekanik och akustik
DOI
10.1051/0004-6361/202142109