Dust spectrum and polarisation at 850 um in the massive IRDC G035.39-00.33
作者： Mika Juvela , Vincent Guillet , Tie Liu , Isabelle Ristorcelli , Veli-Matti Pelkonen
DOI: 10.1051/0004-6361/201833245
关键词: Noise (radio) 、 Spectral index 、 Protein filament 、 Magnetic field 、 Radiative transfer 、 Field (physics) 、 Astrophysics 、 Opacity 、 Black-body radiation 、 Physics
摘要: The dust sub-millimetre polarisation of star-forming clouds carries information on and the role magnetic fields in cloud evolution. With observations a dense filamentary G035.39-00.33, we aim to characterise emission properties variations fraction. JCMT SCUBA-2/POL-2 data at 850um are combined with Planck (353GHz) map fractions. previous SCUBA-2 (450um 850um) Herschel data, column densities determined via modified blackbody fits radiative transfer modelling. Models constructed examine how angles fractions depend potential field geometries grain alignment. POL-2 show clear changes orientation. filament has peak density N(H2)~7 10^22 cm-2, minimum temperature T~12 K, mass some 4300Msun for area N(H2)> 5 10^21 cm-2. estimated average value opacity spectral index is beta ~ 1.9. ratio J band optical depths tau(250 um)/tau(J) 2.5 10^-3, more than four times typical values diffuse medium. fraction decreases as function p 1% central filament. Because noise, observed decrease p(N) significant only N(H2)>2 suggest that alignment not constant. Although can be explained complete loss above 10^4 cm-3 or using predictions torques alignment, uncertainty geometry spatial filtering prevent strong conclusions. G035.39-00.33 shows signs evolution low suggestive polarised from its densest parts.
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