SEDIGISM: the kinematics of ATLASGAL filaments
Journal article, 2018

Analyzing the kinematics of filamentary molecular clouds is a crucial step toward understanding their role in the star formation process. Therefore, we study the kinematics of 283 filament candidates in the inner Galaxy, that were previously identified in the ATLASGAL dust continuum data. The (CO)-C-13(2 - 1) and (CO)-O-18(2 - 1) data of the SEDIGISM survey (Structure, Excitation, and Dynamics of the Inner Galactic Inter Stellar Medium) allows us to analyze the kinematics of these targets and to determine their physical properties at a resolution of 30 '' and 0.25 km s(-1). To do so, we developed an automated algorithm to identify all velocity components along the line-of-sight correlated with the ATLASGAL dust emission, and derive size, mass, and kinematic properties for all velocity components. We find two-third of the filament candidates are coherent structures in position-position-velocity space. The remaining candidates appear to be the result of a superposition of two or three filamentary structures along the line-of- sight. At the resolution of the data, on average the filaments are in agreement with Plummer-like radial density profiles with a power-law exponent of p approximate to 1.5 +/- 0.5, indicating that they are typically embedded in a molecular cloud and do not have a well-defined outer radius. Also, we find a correlation between the observed mass per unit length and the velocity dispersion of the filament of m proportional to o(v)(2). We show that this relation can be explained by a virial balance between self-gravity and pressure. Another possible explanation could be radial collapse of the filament, where we can exclude infall motions close to the free-fall velocity.

methods: data analysis

stars: formation

molecular data

submillimeter: ISM

ISM: clouds

ISM: kinematics and dynamics

Author

M. Mattern

Max Planck Society

J. Kauffmann

Massachusetts Institute of Technology (MIT)

Max Planck Society

T. Csengeri

Max Planck Society

J. S. Urquhart

University Of Kent

S. Leurini

Osservatorio Astronomico di Cagliari

F. Wyrowski

Max Planck Society

A. Giannetti

Istituto di Radioastronomia

P. J. Barnes

University of Florida

University of New England

H. Beuther

Max Planck Society

L. Bronfman

University of Chile (UCH)

A. Duarte-Cabral

Cardiff University

T. Henning

Max Planck Society

Jouni Kainulainen

Chalmers, Space, Earth and Environment, Astronomy and Plasmaphysics, Galactic Astrophysics

K. M. Menten

Max Planck Society

E. Schisano

Istituto nazionale di astrofisica (INAF)

F. Schuller

Paris Diderot University

Astronomy and Astrophysics

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

Vol. 619 A166

Subject Categories

Astronomy, Astrophysics and Cosmology

Geophysics

Structural Biology

DOI

10.1051/0004-6361/201833406

More information

Latest update

12/19/2018