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2021ApJ...918...85L - Astrophys. J., 918, 85-85 (2021/September-2)

The JCMT BISTRO Survey: an 850/450 µm polarization study of NGC 2071IR in Orion B.

LYO A.-R., KIM J., SADAVOY S., JOHNSTONE D., BERRY D., PATTLE K., KWON W., BASTIEN P., ONAKA T., DI FRANCESCO J., KANG J.-H., FURUYA R., HULL C.L.H., TAMURA M., KOCH P.M., WARD-THOMPSON D., HASEGAWA T., HOANG T., ARZOUMANIAN D., WON LEE C., LEE C.-F., BYUN D.-Y., KIRCHSCHLAGER F., DOI Y., KIM K.-T., HWANG J., DIEP P.N., FANCIULLO L., LEE S.-S., PARK G., YOO H., CHUNG E.J., WHITWORTH A., MAIRS S., SOAM A., LIU T., TANG X., COUDE S., ANDRE P., BOURKE T.L., CHEN H.-R.V., CHEN Z., CHEN W.P., CHEN M., CHING T.-C., CHO J., CHOI M., CHOI Y., CHRYSOSTOMOU A., DAI S., DOWELL C.D., DUAN H.-Y., DUAN Y., EDEN D., ESWARAIAH C., EYRES S., FIEGE J., FISSEL L.M., FRANZMANN E., FRIBERG P., FRIESEN R., FULLER G., GLEDHILL T., GRAVES S., GREAVES J., GRIFFIN M., GU Q., HAN I., HATCHELL J., HAYASHI S., HOUDE M., INOUE T., INUTSUKA S.-I., IWASAKI K., JEONG I.-G., KANG M., KATAOKA A., KAWABATA K., KEMPER F., KIM G., KIM M.-R., KIM S., KIM K.H., KIRK J., KOBAYASHI M.I.N., KONYVES V., KUSUNE T., KWON J., LACAILLE K., LAI S.-P., LAW C.-Y., LEE J.-E., LEE Y.-H., LEE H., LI D., LI D., LI H.-B., LIU H.-L., LIU J., LIU S.-Y., LU X., MATSUMURA M., MATTHEWS B., MORIARTY-SCHIEVEN G., NAGATA T., NAKAMURA F., NAKANISHI H., NGOC N.B., OHASHI N., PARSONS H., PERETTO N., PRIESTLEY F., PYO T.-S., QIAN L., QIU K., RAO R., RAWLINGS J., RAWLINGS M.G., RETTER B., RICHER J., RIGBY A., SAITO H., SAVINI G., SCAIFE A., SETA M., SHIMAJIRI Y., SHINNAGA H., TAHANI M., TANG Y.-W., TOMISAKA K., TRAM L.N., TSUKAMOTO Y., VITI S., WANG J.-W., WANG H., XIE J., YEN H.-W., YUAN J., YUN H.-S., ZENKO T., ZHANG G., ZHANG C.-P., ZHANG Y., ZHOU J., ZHU L., DE LOOZE I., DOWELL C.D., FALLE S., ROBITAILLE J.-F. and VAN LOO S.

Abstract (from CDS):

We present the results of simultaneous 450 µm and 850 µm polarization observations toward the massive star-forming region NGC 2071IR, a target of the BISTRO (B-fields in STar-forming Region Observations) Survey, using the POL-2 polarimeter and SCUBA-2 camera mounted on the James Clerk Maxwell Telescope. We find a pinched magnetic field morphology in the central dense core region, which could be due to a rotating toroidal disklike structure and a bipolar outflow originating from the central young stellar object IRS 3. Using the modified Davis-Chandrasekhar-Fermi method, we obtain a plane-of-sky magnetic field strength of 563 ± 421 µG in the central ∼0.12 pc region from 850 µm polarization data. The corresponding magnetic energy density of 2.04 x 10^–8 erg cm^–3 is comparable to the turbulent and gravitational energy densities in the region. We find that the magnetic field direction is very well aligned with the whole of the IRS 3 bipolar outflow structure. We find that the median value of polarization fractions is 3.0% at 450 µm in the central 3' region, which is larger than the median value of 1.2% at 850 µm. The trend could be due to the better alignment of warmer dust in the strong radiation environment. We also find that polarization fractions decrease with intensity at both wavelengths, with slopes, determined by fitting a Rician noise model of 0.59 ± 0.03 at 450 µm and 0.36 ± 0.04 at 850 µm, respectively. We think that the shallow slope at 850 µm is due to grain alignment at the center being assisted by strong radiation from the central young stellar objects.

Journal keyword(s): Star-forming regions - Interstellar magnetic fields - Interstellar medium - Polarimetry

Simbad objects: 26

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