ARE MAGNETIC FIELDS AND OUTFLOWS ALIGNED IN PROTOSTELLAR CORES? Chat Hull University of California, Berkeley Radio Astronomy Laboratory 8 July 2013 CARMA.

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Presentation transcript:

ARE MAGNETIC FIELDS AND OUTFLOWS ALIGNED IN PROTOSTELLAR CORES? Chat Hull University of California, Berkeley Radio Astronomy Laboratory 8 July 2013 CARMA Science Symposium University of Chicago Chicago, Ill.

Credit: Bill Saxton, CfA

Girart+ 2006Rao Outflow B-field IRAS 16293NGC 1333-IRAS 4A Misalignment of B-fields and outflows

CARMA Combined Array for Research in Millimeter-wave Astronomy Consortium: Berkeley, Caltech, Illinois, Maryland, Chicago – 6 10-m, 9 6-m, m telescopes – Observations at 1 cm, 3 mm, and 1 mm (polarization!) – Located in Cedar Flat, CA (near Bishop)

Orthomode transducer SIS mixers WBA13 I.F. amplifiers (1-9 GHz ) 1 mm dual-polarization receivers 1 inch Credit: Dick Plambeck Waveguide circular polarizer

TADPOL collaboration UC Berkeley Chat Hull (PI), Dick Plambeck, Mel Wright, Carl Heiles, Geoff Bower University of Maryland Marc Pound, Alberto Bolatto, Katherine Jameson, Lee Mundy Caltech Thushara Pillai, John Carpenter, James Lamb, Nikolaus Volgenau University of Illinois, Urbana-Champagne Ian Stephens, Leslie Looney, Woojin Kwon, Dick Crutcher, Nick Hakobian Other Dan Marrone (Arizona), Meredith Hughes (Wesleyan), John Vaillancourt & Göran Sandell (USRA-SOFIA), John Tobin (NRAO), Jason Fiege (Manitoba), Erica Franzmann (Manitoba), Martin Houde (UWO, Caltech), Brenda Matthews (NRC-CNRC)

TADPOL survey 37 sources Triples number of interferometric polarization maps ~300 observing hours CARMA C, D, & E arrays 1 – 4" resolution 10 higher resolution than CSO & JCMT Probes intermediate region between ~0.1 pc (single-dish) and ~100 AU (ALMA)

TADPOL results L1157 See also: Stephens+ 2013, ApJL, 769, L15 2″

Credit: Bill Saxton, CfA

TADPOL results NGC 1333-IRAS 4ANGC 1333-IRAS 4B 2″

TADPOL results L1527NGC 1333-IRAS 2A 2″3″

TADPOL results Ser-emb 8 3″

Cumulative Distribution Function (CDF) (Projected) angle between outflow & B-field (deg) Outflow vs. B-field: distribution Simulation: outflows & B-fields aligned within a 20º cone (tightly aligned) Simulation: outflows & B-fields are randomly oriented KS-test results: 20º cone ruled out ( p-value ~ ) Misaligned ( 0.33 ) and random ( 0.33 ) cannot be ruled out Simulation: outflows & B-fields aligned between 70–90º (preferentially misaligned) Hull+ 2013, ApJ, 768, 159 (updated version: July ‘13)

Pre-summary: poster teaser

TADPOL results: B-fields are either preferentially misaligned (perp.) or randomly aligned with respect to outflows at the ~1000 AU scale Thus, circumstellar disks are misaligned with fields in the cores from which they formed CARMA 1 mm polarization system is online and accepting proposals Data release coming soon! TADPOL first results: ApJ, 768, 159ApJ, 768, 159 TADPOL survey (CARMA key project): tadpol.astro.illinois.edutadpol.astro.illinois.edu Summary

Fin