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The G14.225-0.506 infrared dark cloud (IRDC G14.2) displays a remarkablecomplex of parallel dense molecular filaments projected on the plane of thesky. Previous dust emission and molecular-line studies have speculated whethermagnetic fields could have played an important role in the formation of suchlong-shaped structures, which are hosts to numerous young stellar sources. Inthis work we have conducted a vast polarimetric survey at optical andnear-infrared wavelengths in order to study the morphology of magnetic fieldlines in IRDC G14.2 through the observation of background stars. Theorientation of interstellar polarization, which traces magnetic field lines, isperpendicular to most of the filamentary features within the cloud.Additionally, the larger-scale molecular cloud as a whole exhibits an elongatedshape also perpendicular to magnetic fields. Estimates of magnetic fieldstrengths indicate values in the range $320 - 550\,\mu$G, which allowssub-alfv\'enic conditions, but does not prevent the gravitational collapse ofhub-filament structures, which in general are close to the critical state.These characteristics suggest that magnetic fields played the main role inregulating the collapse from large to small scales, leading to the formation ofseries of parallel elongated structures. The morphology is also consistent withnumerical simulations that show how gravitational instabilities develop understrong magnetic fields. Finally, the results corroborate the hypothesis that astrong support from internal magnetic fields might explain why the cloud seemsto be contracting on a time scale 2-3 times larger than what is expected from afree-fall collapse.

Magnetically Dominated Parallel Interstellar Filaments at the Infrared Dark Cloud G14.225-0.506