On the equilibrium of rotating filaments

Autor(en)

Simone Recchi, Alvaro Hacar Gonzalez, Arsen Palestini

Abstrakt

The physical properties of the so-called Ostriker isothermal, non-rotating filament have been classically used as benchmark to interpret the stability of the filaments observed in nearby clouds. However, such static picture seems to contrast with the more dynamical state observed in different filaments. In order to explore the physical conditions of filaments under realistic conditions, in this work we theoretically investigate how the equilibrium structure of a filament changes in a rotating configuration. To do so, we solve the hydrostatic equilibrium equation assuming both uniform and differential rotations independently. We obtain a new set of equilibrium solutions for rotating and pressure truncated filaments. These new equilibrium solutions are found to present both radial and projected column density profiles shallower than their Ostriker-like counterparts. Moreover, and for rotational periods similar to those found in the observations, the centrifugal forces present in these filaments are also able to sustain large amounts of mass (larger than the mass attained by the Ostriker filament) without being necessary unstable. Our results indicate that further analysis on the physical state of star-forming filaments should take into account rotational effects as stabilizing agents against gravity.

Organisation(en)

Institut für Astrophysik

Externe Organisation(en)

Università degli Studi di Roma La Sapienza

Journal

Monthly Notices of the Royal Astronomical Society

Band

444

Seiten

1775-1782

Anzahl der Seiten

8

ISSN

0035-8711

DOI

https://doi.org/10.1093/mnras/stu1566

Publikationsdatum

10-2014

Peer-reviewed

Ja

ÖFOS 2012

103003 Astronomie, 103004 Astrophysik

Schlagwörter

ASJC Scopus Sachgebiete

Astronomy and Astrophysics, Space and Planetary Science

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/368a7dd9-a424-4f96-b45e-7d2d8d671ccd