2018ApJ...861...65S

Query : 2018ApJ...861...65S

2018ApJ...861...65S - Astrophys. J., 861, 65-65 (2018/July-1)

Magnetic fields toward Ophiuchus-B derived from SCUBA-2 polarization measurements.

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

Abstract (from CDS):

We present the results of dust emission polarization measurements of Ophiuchus-B (Oph-B) carried out using the Submillimetre Common-User Bolometer Array 2 (SCUBA-2) camera with its associated polarimeter (POL-2) on the James Clerk Maxwell Telescope in Hawaii. This work is part of the B-fields in Star-forming Region Observations survey initiated to understand the role of magnetic fields in star formation for nearby star-forming molecular clouds. We present a first look at the geometry and strength of magnetic fields in Oph-B. The field geometry is traced over ∼0.2 pc, with clear detection of both of the sub-clumps of Oph-B. The field pattern appears significantly disordered in sub-clump Oph-B1. The field geometry in Oph-B2 is more ordered, with a tendency to be along the major axis of the clump, parallel to the filamentary structure within which it lies. The degree of polarization decreases systematically toward the dense core material in the two sub-clumps. The field lines in the lower density material along the periphery are smoothly joined to the large-scale magnetic fields probed by NIR polarization observations. We estimated a magnetic field strength of 630 ± 410 µG in the Oph-B2 sub-clump using a Davis-Chandrasekhar-Fermi analysis. With this magnetic field strength, we find a mass-to-flux ratio λ = 1.6 ± 1.1, which suggests that the Oph-B2 clump is slightly magnetically supercritical.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): ISM: individual objects: Ophiuchus - ISM: structure - polarization - radio continuum: ISM - stars: formation

Simbad objects: 15

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Number of rows : 15
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 350 0
2 OMC 3 MoC 05 35 20.0 -05 01 00           ~ 301 1
3 IRAS 16226-2420 TT* 16 25 39.58128 -24 26 34.9116       16.78 14.84 M2 52 0
4 NAME rho Oph Cloud B1 PoC 16 27 10.5 -24 29 30           ~ 54 1
5 NAME rho Oph B Cloud MoC 16 27 11 -24 28.5           ~ 88 1
6 2MASS J16271643-2431145 Y*O 16 27 16.438 -24 31 14.55           ~ 19 0
7 BKLT J162721-242728 Y*O 16 27 21.83424 -24 27 27.5868           ~ 24 0
8 NAME rho Oph B2 Cloud PoC 16 27 27.9 -24 26 29           ~ 86 1
9 Elia 2-32 Y*O 16 27 28.44576 -24 27 21.0348           K6.5 121 1
10 Elia 2-33 Y*O 16 27 30.18024 -24 27 43.3656           M2 125 1
11 ISO-Oph 150 TT* 16 27 30.91152 -24 27 33.1956           ~ 19 0
12 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
13 GCNM 23 Y*O 18 29 49.63 +01 15 21.9           ~ 291 2
14 W 51e2 Ma* 19 23 43.906 +14 30 34.48           ~ 222 0
15 W 51e8 HII 19 23 44.2 +14 30 28           ~ 41 0

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