![]() The optical and far-infrared polarization vectors both trace a common direction indicating that the core preserved the magnetic field morphology inherited by the parental cloud while it was evolving and contracting. We obtained new polarimetric HAWC+ data at 214 µm. Previous optical polarimetry of this cloud, which traces the low-density cloud-scale magnetic field, revealed a uniform strength of B ≈ 100 µm and a field structure aligned perpendicularly to the main axis of the cloud. It is embedded in the Lupus I molecular cloud, the least evolved component of the Lupus complex. HAWC+ targeted the low-mass protostellar core IRAS 15398-3359, which hosts a protostar younger than 104 yr. The dust particles are predicted to align with the local magnetic field, giving rise to thermal radiation polarized perpendicularly with respect to B.Īs part of its southern deployment to New Zealand in 2018, SOFIA sought to study the initial stages of low-mass star formation in a highly magnetized environment. Magnetic fields are difficult to detect, but the High-resolution Airborne Wideband Camera Plus (HAWC+) on SOFIA observes polarized dust emission at far-infrared wavelengths that are not accessible from the ground. However, such a feature has been observed only rarely, especially in low-mass objects, for which there are only two clear detections reported in the literature. At the scales of dense cores (fractions of parsec), the theory of magnetically-driven collapse in a uniform field predicts first the formation of a flattened structure (a pseudodisc), since the matter can only flow along the field lines later, the gravitational pull grows strong enough to pinch the field lines, giving rise to a characteristic hourglass shape. However, how they interplay with other important forces - such as gravity and turbulence - are topics currently under great debate. ![]() Magnetic fields (B) are ubiquitous in interstellar space, and their role in the star-formation process is of fundamental importance. Paper: Magnetic Properties of the Protostellar Core IRAS 15398-3359Į. ![]() SOFIA NASA Observatory and Program Assessment Council (SNOPAC) German SOFIA Science Working Group (GSSWG) Green Bank Observatory/SOFIA Joint Observations ![]()
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