J/ApJ/724/L113 Polarization of IRAS 18089-1732 (Beuther+, 2010)
Magnetic field structure in a high-mass outflow/disk system.
Beuther H., Vlemmings W.H.T., Rao R., van der Tak F.F.S.
<Astrophys. J., 724, L113-L117 (2010)>
=2010ApJ...724L.113B 2010ApJ...724L.113B
ADC_Keywords: Polarization ; H II regions ; Interstellar medium
Keywords: ISM: jets and outflows - stars: early-type - stars: formation -
stars: individual (IRAS 18089-1732) - techniques: polarimetric -
techniques: spectroscopic
Abstract:
To characterize the magnetic field structure of the outflow and core
region within a prototypical high-mass star-forming region, we
analyzed polarized CO(3-2) -for the first time observed with the
Submillimeter Array- as well as 880um submillimeter continuum
emission from the high-mass outflow/disk system IRAS 18089-1732.
Both emission features with polarization degrees at a few percent
level indicate that the magnetic field structure is largely aligned
with the outflow/jet orientation from small core scales to larger
outflow scales. Although quantitative estimates are crude, the
analysis indicates that turbulent energy dominates over magnetic
energy. The data also suggest a magnetic field strength increase from
the lower-density envelope to the higher-density core.
Description:
The region was observed with the Submillimeter Array (SMA) in compact
and extended configurations in 2008 May and 2009 August. The phase
center was RA=18:11:51.4,DEC=-17:31:28.5(J2000.0), and the tuning
frequency was 345.796GHz in the upper sideband (vlsr=33.8km/s). The
spectral resolution was 0.8125kHz (∼0.7km/s).
Objects:
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RA (2000) DE Designation(s)
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18 11 51.4 -17 31 28.5 IRAS 18089-1732 = GAL 012.89+00.49
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 40 110 Polarization measurements
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See also:
V/112 : Catalog of Star-Forming Regions in the Galaxy (Avedisova, 2002)
II/225 : Catalog of Infrared Observations, Edition 5 (Gezari+ 1999)
II/125 : IRAS catalogue of Point Sources, Version 2.0 (IPAC 1986)
J/A+A/515/A42 : Catalog of high extinction clouds (Rygl+, 2010)
J/other/PASA/26.439 : K-band images of star-forming regions (Longmore+, 2009)
J/MNRAS/368/1223 : SCUBA observations of cold cores (Hill+, 2006)
J/A+A/417/115 : High-mass protostellar candidates (Williams+, 2004)
J/ApJ/566/945 : Massive star forming regions at 1.2mm (Beuther+, 2002)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 17 A17 --- Source Observation source ("Dust emission" (880um),
"CO(3-2) at 40km/s" or "CO(3-2) at 44km/s")
19- 24 F6.2 arcsec oRA Offset in Right Ascension from phase center (1)
26- 31 F6.2 arcsec oDE Offset in Declination from phase center (1)
33- 36 F4.1 % Pol [1/67] Polarization of Source
38- 40 I3 deg PA [-88/89] Polarization angle
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Note (1): Center position: 18:11:51.4-17:31:28.5 (J2000)
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History:
From electronic version of the journal
(End) Greg Schwarz [AA], Emmanuelle Perret [CDS] 06-Aug-2012