Magnetic field uniformity across the GF 9-2 YSO, L1082C dense core, and GF 9 filamentary dark cloud
Clemens, Dan P.
El Batal, A. M.
MetadataShow full item record
Citation (published version)Dan P Clemens, A.M. El Batal, C. Cerny, S. Kressy, G. Schroeder, T. Pillai. 2018. "Magnetic Field Uniformity Across the GF 9-2 YSO, L1082C Dense Core, and GF 9 Filamentary Dark Cloud." ASTROPHYSICAL JOURNAL, Volume 869, Issue 1, pp. ? - ? (1). https://doi.org/10.3847/1538-4357/aaf104
The orientation of the magnetic field (B-field) in the lamentary dark cloud GF 9 was traced from the periphery of the cloud into the L1082C dense core that contains the low-mass, low-luminosity Class 0 young stellar object (YSO) GF 9-2 (IRAS 20503+6006). This was done using SOFIA HAWC+ dust thermal emission polarimetry (TEP) at 216 μm in combination with Mimir near-infrared background starlight polarimetry (BSP) conducted at H-band (1.6 μm) and K-band (2.2 μm). These observations were augmented with published I-band (0.77 μm) BSP and Planck 850 μm TEP to probe B-field orientations with offset from the YSO in a range spanning 6000 AU to 3 pc. No strong B-field orientation change with offset was found, indicating remarkable uniformity of the B-field from the cloud edge to the YSO environs. This finding disagrees with weak-field models of cloud core and YSO formation. The continuity of inferred B-field orientations for both TEP and BSP probes is strong evidence that both are sampling a common B-field that uniformly threads the cloud, core, and YSO region. Bayesian analysis of Gaia DR2 stars matched to the Mimir BSP stars finds a distance to GF 9 of 270 ± 10 pc. No strong wavelength dependence of B-field orientation angle was found, contrary to previous claims.