2019ApJ...876...42W

Query : 2019ApJ...876...42W

2019ApJ...876...42W - Astrophys. J., 876, 42-42 (2019/May-1)

JCMT BISTRO survey: magnetic fields within the hub-filament structure in IC 5146.

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

Abstract (from CDS):

We present the 850 µm polarization observations toward the IC 5146 filamentary cloud taken using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) and its associated polarimeter (POL-2), mounted on the James Clerk Maxwell Telescope, as part of the B-fields In STar forming Regions Observations. This work is aimed at revealing the magnetic field morphology within a core-scale (<=1.0 pc) hub-filament structure (HFS) located at the end of a parsec-scale filament. To investigate whether the observed polarization traces the magnetic field in the HFS, we analyze the dependence between the observed polarization fraction and total intensity using a Bayesian approach with the polarization fraction described by the Rice likelihood function, which can correctly describe the probability density function of the observed polarization fraction for low signal-to-noise ratio data. We find a power-law dependence between the polarization fraction and total intensity with an index of 0.56 in AV ∼ 20-300 mag regions, suggesting that the dust grains in these dense regions can still be aligned with magnetic fields in the IC 5146 regions. Our polarization maps reveal a curved magnetic field, possibly dragged by the contraction along the parsec-scale filament. We further obtain a magnetic field strength of 0.5 ± 0.2 mG toward the central hub using the Davis-Chandrasekhar-Fermi method, corresponding to a mass-to-flux criticality of ∼1.3 ± 0.4 and an Alfvenic Mach number of <0.6. These results suggest that gravity and magnetic field are currently of comparable importance in the HFS and that turbulence is less important.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): ISM: individual objects: IC 5146 - ISM: magnetic fields - ISM: structure - polarization - radio continuum: ISM - stars: formation

Simbad objects: 11

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Number of rows : 11
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2024 		#notes
1 NGC 1333 OpC 03 29 11.3 +31 18 36           ~ 1450 1
2 IC 348 OpC 03 44 31.7 +32 09 32           ~ 1392 1
3 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2331 0
4 NAME Ori A MoC 05 38 -07.1           ~ 3011 0
5 NAME NGC 6334 FIR V Cl* 17 19 57 -35 57.5           ~ 95 0
6 NGC 6334 HII 17 20 53 -36 07.9           ~ 682 0
7 SDC G14.225-0.506 DNe 18 18 11.49 -16 49 29.6           ~ 22 0
8 NAME Serpens South molecular cloud MoC 18 30 -02.0           ~ 98 0
9 RAFGL 5541 Y*O 18 52 50.26 +00 55 29.6           ~ 117 1
10 W 51 SNR 19 23 50 +14 06.0           ~ 1278 1
11 IC 5146 OpC 21 53 29.3 +47 14 46           ~ 466 2

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