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