2005 June 2260th Symposium on Molecular Spectroscopy Outflows and Magnetic Fields in L1448 IRS3 Woojin Kwon Leslie W. Looney Richard M. Crutcher Jason.

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

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

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.

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

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⊙

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

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

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?

Spitzer Space TelescopeSpitzer Space Telescope

Produced by J. Tobin from our team’s data

L1448 mm

B

L1448 IRS3 A

C