Zielinski, Niko;
Wolf, Sebastian;
Pattle, Kate;
(2023)
On the origin of de-polarization in CB54.
Astronomische Nachrichten | Astronomical Notes
, Article e20220060. 10.1002/asna.20220060.
(In press).
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Abstract
We present polarimetric observations of the Bok globule CB54 in the far-infrared via SOFIA/HAWC+ bands D (154 (Formula presented.) m) and E (214 (Formula presented.) m). We detect polarization with mean polarization degrees of (Formula presented.) (Formula presented.) 5.4 (Formula presented.) and (Formula presented.) (Formula presented.) 5.4 (Formula presented.) at 154 and 214 (Formula presented.) m, respectively. The polarization degree decreases toward the inner region of CB54, revealing a “polarization hole”. This finding can be explained by the impact of dichroic absorption counteracting the effect of polarized emission. The same effect allows us to explain the observed wavelength-dependent orientation of the linear polarization in the dense, central region of CB54. The polarization pattern appears uniform at core scales but un-ordered at larger scales—similar to what was found in previous studies of this object. The mean polarization angle amounts to (Formula presented.) = 62.4 (Formula presented.) 44.5° and (Formula presented.) = (Formula presented.) 60.0° at 154 and 214 (Formula presented.) m, respectively.
| Type: | Article |
|---|---|
| Title: | On the origin of de-polarization in CB54 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1002/asna.20220060 |
| Publisher version: | https://doi.org/10.1002/asna.20220060 |
| Language: | English |
| Additional information: | © 2023 The Authors. Astronomische Nachrichten published by Wiley-VCH GmbH./ This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes. http://creativecommons.org/licenses/by-nc/4.0/. |
| Keywords: | instrumentation: polarimeters, ISM: magnetic fields, polarization |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10168797 |
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