ARE MAGNETIC FIELDS AND OUTFLOWS ALIGNED IN PROTOSTELLAR CORES? Chat Hull UC Berkeley, Radio Astronomy Laboratory 10 January 2013 Session 426. Star Formation.

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Presentation transcript:

ARE MAGNETIC FIELDS AND OUTFLOWS ALIGNED IN PROTOSTELLAR CORES? Chat Hull UC Berkeley, Radio Astronomy Laboratory 10 January 2013 Session 426. Star Formation – Clusters and Cores AAS 221 st meeting Long Beach, CA

Credit: Bill Saxton, Harvard-Smithsonian Center for Astrophysics Simple model of SF with B-fields

Girart Rao Holland Misalignment of B-fields and outflows Outflow B-field IRAS IRAS 4A VLA 1623

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

TADPOL collaboration UC Berkeley Chat Hull (PI), Dick Plambeck, Meredith Hughes, 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 Jason Fiege (Manitoba), Erica Franzmann (Manitoba), Martin Houde (UWO, Caltech), Dan Marrone (Arizona), Brenda Matthews (NRC-CNRC), John Vaillancourt & Göran Sandell(USRA-SOFIA), John Tobin (NRAO)

TADPOL results L1157

NGC 1333-IRAS 2ANGC 1333-IRAS 4A TADPOL results

NGC 1333-IRAS 4B Ser-emb 8 TADPOL results

Cumulative Distribution Function (CDF) (Projected) angle between outflow & B-field (deg) Outflow vs. B-field: distribution Hull+ 2012, submitted 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 ~ ) Anti-aligned (0.79) and random (0.64) cannot be ruled out Simulation: outflows & B-fields aligned between 70–90º (anti-aligned)

Conclusions B-fields are either anti-aligned 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 TADPOL survey (CARMA key project): tadpol.astro.illinois.edu tadpol.astro.illinois.edu Questions? Contact Chat Hull:

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