Tidal foces as a regulator of star formation in Taurus

TL;DR

This paper proposes that tidal forces from the Galaxy, rather than magnetic fields, regulate the low star formation efficiency in the Taurus molecular cloud by analyzing its structure and orientation.

Contribution

It introduces a tidal regulation model for star formation in Taurus, challenging the traditional magnetic support hypothesis.

Findings

Taurus's structure and orientation suggest tidal forces influence star formation.

Tidal forces can explain low star-formation efficiency without magnetic fields.

Magnetic fields are not necessary to support Taurus against collapse.

Abstract

Only a few molecular clouds in the Solar Neighborhood exhibit the formation of only low-mass stars. Traditionally, these clouds have been assumed to be supported against more vigorous collapse by magnetic fields. The existence of strong magnetic fields in molecular clouds, however, poses serious problems for the formation of stars and of the clouds themselves. In this {\em Letter}, we review the three-dimensional structure and kinematics of Taurus --the archetype of a region forming only low-mass stars-- as well as its orientation within the Milky way. We conclude that the particularly low star-formation efficiency in Taurus may naturally be explained by tidal forces from the Galaxy, with no need for magnetic regulation or stellar feedback.