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2005 June 22 60th Symposium on Molecular Spectroscopy
Outflows and Magnetic Fields in L1448 IRS3
Woojin KwonLeslie W. Looney
Richard M. CrutcherJason M. Kirk
University of Illinois at Urbana-Champaign
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L1448 IRS3 (A, B, &C)L1448 IRS3 (A, B, &C)
Perseus molecular cloud complex (~300 pc) 70" northwest of L1448mm In blue-shifted lobe of outflow of L1448mm Three Class 0 sources resolved at =3mm
(Looney et al. 2000)
One or two outflows (e.g. Bachiller et al. 1990, 1995; Barsony et al. 1998)
No clear observation…L1448 mm
A
C
B
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ObservationObservation
Polarimetry using BIMA CO 2-1 (230.538GHz)
continuum (~ 1mm) C configuration
Beam 2.5" x 4.5" Ch. width 4 km/s
2003 Oct. & Nov.
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Continuum Emission (~1mm)Continuum Emission (~1mm)
L1448 IRS3A: 0.3 M⊙
B: 1.7 M⊙ C: < 0.05 M⊙
Optically thin
Gas = 100 x Dust
T = 35 K, β = 1
A
B
C
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Outflows of L1448 IRS3Outflows of L1448 IRS3
Integrated intensity mapRed 25~9 km/sBlack 9~1 km/s (VLSR= 5km/s)Blue 1~ -19 km/s (L1448 mm Contamination)
A: nearly perpendicular to LOSPA 155°North: 0.001 M ⊙
= R0.0002 + Bk0.0008South: (part of Bk0.0016 M⊙)
B: +20~ -30 km/s outflow, PA 105°Red-shifted: R0.0005 M⊙ + (part of Bk0.0016 M⊙) Blue-shifted: B0.0012 M⊙
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Vectors: B field direction
L1448 in 850 μm, SCUBA
Magnetic Field in ContinuumMagnetic Field in Continuum
Produced by J. Kirk from SCUBA archive data~5% polarization in center
Vectors: polarization direction
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Magnetic Field in CO 2-1Magnetic Field in CO 2-1
CO 2-1 Intensity map
2 ch.(1~9 km/s) combinedPolarization directionOutflow direction
Goldreich-Kylafis effect (e.g. Kylafis, 1983)
~ 10% polarization
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Summary and DiscussionSummary and Discussion
Clear results showing two outflows from A and B Marginal detection of polarization in continuum
and CO 2-1 Excellent region for star formation
Nearly perpendicular outflowBinary systemStar formation triggered by outflows
Really perpendicular?
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Spitzer Space TelescopeSpitzer Space Telescope
Produced by J. Tobin from our team’s data
L1448 mm
B
L1448 IRS3 A
C