Filament Rotation in the California L1482 Cloud
Artikel i vetenskaplig tidskrift, 2021

We analyze the gas mass distribution, the gas kinematics, and the young stellar objects of the California Molecular Cloud L1482 filament. The mean Gaia DR2 YSO distance is 511(-16)(+17) pc. In terms of the gas, the line-mass (M/L) profiles are symmetric scale-free power laws consistent with cylindrical geometry. We calculate the gravitational potential and field profiles based on these. Our IRAM 30 m multi-tracer position-velocity diagrams highlight twisting and turning structures. We measure the (CO)-O-18 velocity profile perpendicular to the southern filament ridgeline. The profile is regular, confined (projected r less than or similar to 0.4 pc), antisymmetric, and, to first order, linear, with a break at r similar to 0.25 pc. We use a simple solid-body rotation toy model to interpret it. We show that the centripetal force, compared to gravity, increases toward the break; when the ratio of forces approaches unity, the profile turns over, just before the implied filament breakup. The timescales of the inner (outer) gradients are similar to 0.7 (6.0) Myr. The timescales and relative roles of gravity to rotation indicate that the structure is stable, long lived (similar to a few times 6 Myr), and undergoing outside-in evolution. This filament has practically no star formation, a perpendicular Planck plane-of-the-sky magnetic field morphology, and 2D "zig-zag" morphology, which together with the rotation profile lead to the suggestion that the 3D shape is a "corkscrew" filament. These results, together with results in other regions, suggest evolution toward higher densities as rotating filaments shed angular momentum. Thus, magnetic fields may be an essential feature of high-mass (M similar to 10(5) M) cloud filament evolution toward cluster formation.

Interstellar filaments

Interstellar dynamics

Molecular clouds

Young stellar objects

Giant molecular clouds

Interstellar magnetic fields

Författare

R. H. Alvarez-Gutierrez

Universidad de Concepción

A. M. Stutz

Universidad de Concepción

Max-Planck-Gesellschaft

Chi Yan Law

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

Chinese University of Hong Kong

S. Reissl

Universität Heidelberg

R. S. Klessen

Universität Heidelberg

N. W. C. Leigh

American Museum of Natural History

Universidad de Concepción

H-L Liu

Universidad de Concepción

Chinese University of Hong Kong

Chinese Academy of Sciences

R. A. Reeves

Universidad de Concepción

Astrophysical Journal

0004-637X (ISSN) 1538-4357 (eISSN)

Vol. 908 1 86

Ämneskategorier

Astronomi, astrofysik och kosmologi

Geofysik

Fusion, plasma och rymdfysik

DOI

10.3847/1538-4357/abd47c

Mer information

Senast uppdaterat

2021-03-15