Turbulence and Accretion: A High-resolution Study of the B5 Filaments
Abstract
High-resolution observations of the Perseus B5 "core" have previously revealed that this subsonic region actually consists of several filaments that are likely in the process of forming a quadruple stellar system. Since subsonic filaments are thought to be produced at the ~0.1 pc sonic scale by turbulent compression, a detailed kinematic study is crucial to test such a scenario in the context of core and star formation. Here we present a detailed kinematic follow-up study of the B5 filaments at a 0.009 pc resolution using the VLA and GBT combined observations fitted with multicomponent spectral models. Using precisely identified filament spines, we find a remarkable resemblance between the averaged width profiles of each filament and Plummer-like functions, with filaments possessing FWHM widths of ~0.03 pc. The velocity dispersion profiles of the filaments also show decreasing trends toward the filament spines. Moreover, the velocity gradient field in B5 appears to be locally well ordered (~0.04 pc) but globally complex, with kinematic behaviors suggestive of inhomogeneous turbulent accretion onto filaments and longitudinal flows toward a local overdensity along one of the filaments.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- August 2022
- DOI:
- 10.3847/1538-4357/ac7d4a
- arXiv:
- arXiv:2209.00659
- Bibcode:
- 2022ApJ...935...57C
- Keywords:
-
- Star formation;
- Star forming regions;
- Molecular clouds;
- Interstellar filaments;
- Dense interstellar clouds;
- Interstellar clouds;
- Interstellar line emission;
- Interstellar medium;
- 1569;
- 1565;
- 1072;
- 842;
- 371;
- 834;
- 844;
- 847;
- Astrophysics - Astrophysics of Galaxies
- E-Print:
- 27 pages, 12 figures, published in The Astrophysical Journal