Astronomy and Astrophysics, volume 629A, 96-96 (2019/9-1)
Using Herschel and Planck observations to delineate the role of magnetic fields in molecular cloud structure.
Abstract (from CDS):
We present a study of the relative orientation between the magnetic field projected onto the plane of sky (B|) on scales down to 0.4pc, inferred from the polarized thermal emission of Galactic dust observed by Planck at 353GHz, and the distribution of gas column density (NH) structures on scales down to 0.026pc, derived from the observations by Herschel in submillimeter wavelengths, toward ten nearby (d<450pc) molecular clouds. Using the histogram of relative orientation technique in combination with tools from circular statistics, we found that the mean relative orientation between NH and B| toward these regions increases progressively from 0°, where the NH structures lie mostly parallel to B|, with increasing NH, in many cases reaching 90°, where the NH structures lie mostly perpendicular to B|. We also compared the relative orientation between NH and B| and the distribution of NH, which is characterized by the slope of the tail of the NH probability density functions (PDFs). We found that the slopes of the NH PDF tail are steepest in regions where NH and B| are close to perpendicular. This coupling between the NH distribution and the magnetic field suggests that the magnetic fields play a significant role in structuring the interstellar medium in and around molecular clouds. However, we found no evident correlation between the star formation rates, estimated from the counts of young stellar objects, and the relative orientation between NH and B| in these regions.
© J. D. Soler 2019
ISM: general - ISM: magnetic fields - ISM: clouds - dust, extinction - stars: formation - submillimeter: ISM
erratum vol. 635, art. C1 (2020)
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