期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 769, 期 1, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/769/1/L15
关键词
galaxies: star formation; magnetic fields; polarization; stars: protostars
资金
- National Science Foundation [NSF AST 08-38226, AST-0838261]
- CARMA partner universities
- NSF [AST-090930]
- Direct For Mathematical & Physical Scien [0838258] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1140031] Funding Source: National Science Foundation
- Division Of Astronomical Sciences [0838258] Funding Source: National Science Foundation
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1007713] Funding Source: National Science Foundation
We present the first detection of polarization around the Class 0 low-mass protostar L1157-mm at two different wavelengths. We show polarimetric maps at large scales (10 '' resolution at 350 mu m) from the SHARC-II Polarimeter and at smaller scales (1.'' 2-4.'' 5 at 1.3 mm) from the Combined Array for Research in Millimeter-wave Astronomy (CARMA). The observations are consistent with each other and show inferred magnetic field lines aligned with the outflow. The CARMA observations suggest a full hourglass magnetic field morphology centered about the core; this is only the second well-defined hourglass detected around a low-mass protostar to date. We apply two different methods to CARMA polarimetric observations to estimate the plane-of-sky magnetic field magnitude, finding values of 1.4 and 3.4 mG.
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