English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Prestellar cores are generally spheroidal, some of which appear oblate whileothers appear prolate. Very few of them appear circular in projection. Little,however, is understood about the processes or the physical conditions underwhich prolate/oblate cores form. We find that an initially sub-criticalfilament experiencing relatively low pressure ($\lesssim 10^{4}$ K cm$^{-3}$)forms prolate cores (i.e., those with axial ratios in excess of unity) viagradual accumulation of gas in density crests. Meanwhile, a filament that isinitially transcritical and experiences pressure similar to that in the Solarneighbourhood (between $\mathrm{few}\ \times 10^{4}$ K cm$^{-3}$ -$\mathrm{few}\ \times 10^{5}$ K cm$^{-3}$) forms oblate cores (i.e., those withaxial ratios less than unity) via \emph{Jeans like} fragmentation. At higherpressure, however, fragments within the filament do not tend to survive as theyrebound soon after formation. We also argue that quasi-oscillatory features ofvelocity gradient observed along the filament axis, and in the directionorthogonal to the axis, are integral to the filament evolution process andarise due to the growth of corrugations on its surface. The axial component ofthe velocity gradient, in particular, traces the gas-flow along the filamentlength. We therefore posit that it could be used to constrain thefilament-formation mechanism. The magnitude of the respective components ofvelocity gradients increases with increasing external pressure.

Core formation via filament fragmentation and the impact of ambient pressure on it