Pattle, K;
Lai, S-P;
Di Francesco, J;
Sadavoy, S;
Ward-Thompson, D;
Johnstone, D;
Hoang, T;
... Tang, X; + view all
(2021)
JCMT POL-2 and BISTRO Survey Observations of Magnetic Fields in the L1689 Molecular Cloud.
Astrophysical Journal
, 907
(2)
, Article 88. 10.3847/1538-4357/abcc6c.
Preview |
Text
Pattle_2021_ApJ_907_88.pdf - Published Version Download (2MB) | Preview |
Abstract
We present 850 μm polarization observations of the L1689 molecular cloud, part of the nearby Ophiuchus molecular cloud complex, taken with the POL-2 polarimeter on the James Clerk Maxwell Telescope (JCMT). We observe three regions of L1689: the clump L1689N which houses the IRAS 16293-2433 protostellar system, the starless clump SMM-16, and the starless core L1689B. We use the Davis–Chandrasekhar–Fermi method to estimate plane-of-sky field strengths of 366 ± 55 μG in L1689N, 284 ± 34 μG in SMM-16, and 72 ± 33 μG in L1689B, for our fiducial value of dust opacity. These values indicate that all three regions are likely to be magnetically transcritical with sub-Alfvénic turbulence. In all three regions, the inferred mean magnetic field direction is approximately perpendicular to the local filament direction identified in Herschel Space Telescope observations. The core-scale field morphologies for L1689N and L1689B are consistent with the cloud-scale field morphology measured by the Planck Space Observatory, suggesting that material can flow freely from large to small scales for these sources. Based on these magnetic field measurements, we posit that accretion from the cloud onto L1689N and L1689B may be magnetically regulated. However, in SMM-16, the clump-scale field is nearly perpendicular to the field seen on cloud scales by Planck, suggesting that it may be unable to efficiently accrete further material from its surroundings.
| Type: | Article |
|---|---|
| Title: | JCMT POL-2 and BISTRO Survey Observations of Magnetic Fields in the L1689 Molecular Cloud |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3847/1538-4357/abcc6c |
| Publisher version: | http://doi.org/10.3847/1538-4357/abcc6c |
| Language: | English |
| Additional information: | This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| 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.ucl.ac.uk/id/eprint/10123125 |
Loading...
Loading...Loading...| 1. |  United States | 4 |
| 2. |  China | 2 |
| 3. |  Russian Federation | 1 |
| 4. |  United Kingdom | 1 |
| 5. |  Germany | 1 |
Archive Staff Only
 |
View Item |
