We present submillimeter polarimetric observations of the Giant Molecular Cloud (GMC) NGC 6334, obtained using the Hertz instrument at the Caltech Submillimeter Observatory on Mauna Kea. We obtain constraints on GMC magnetic fields by interpreting these Hertz data together with (a) previously published larger-scale submillimeter polarization maps of the GMCs NGC 6334 and G333.6-0.2 obtained usi...

We have observed the linear polarization of 450 μm continuum emission from the Galactic center, using a new polarimetric detector system that is operated on a 2 m telescope at the South Pole. The resulting polarization map extends ∼ 170 pc along the Galactic plane and ∼ 30 pc in Galactic latitude, and thus covers a significant fraction of the central molecular zone. Our map shows that this regi...

We present 1.3 and 3.3 mm polarization maps of Orion-KL obtained with the BIMA array at approximately 4′′ resolution. Thermal emission from magnetically aligned dust grains produces the polarization. Along the Orion “ridge” the polarization position angle varies smoothly from about 10◦ to 40◦, in agreement with previous lower resolution maps. In a small region south of the Orion “hot core,” how...

Using the Submillimeter Common-User Bolometer Array (SCUBA) at the James Clerk Maxwell Telescope (JCMT), we obtained submillimeter polarization maps of the Bok globules B 335, CB 230, and CB 244 at 850 μm. We find strongly aligned polarization vectors in the case of B 335 and CB 230, indicating a strong coupling of the magnetic field to the dust grains. Based on the distribution of the orientat...

We have measured the Zeeman splitting of OH megamaser emission at 1667 MHz from five (ultra)luminous infrared galaxies ([U]LIRGs) using the 305 m Arecibo telescope and the 100 m Green Bank Telescope. Five of eight targeted galaxies show significant Zeeman-splitting detections, with 14 individual masing components detected and line-of-sight magnetic field strengths ranging from ≃ 0.5 − 18 mG. Th...

We examine the effect of weak, small scale magnetic field structure on the rate of reconnection in a strongly magnetized plasma. We recover lower and upper limits on the reconnection rate, depending on the reaction of the magnetic field to stresses exerted from within the reconnection layer. Using Goldreich and Sridhar’s model of strong turbulence in a magnetized plasma with negligible intermit...

Mean pulse profiles and polarization properties are presented for nine southern pulsars. The observations were made using the Parkes radio telescope at frequencies near 1330 MHz; three of the nine pulsars were also observed at 660 MHz. A very high degree of circular polarization was observed in PSR J1603−7202. Complex position angle variations which are not well described by the rotating-vector...

The evolution of the magnetic field and angular momentum in the collapsing cloud core is studied using three-dimensional resistive MHD nested grid simulations. Starting with a Bonnor-Ebert isothermal cloud rotating in a uniform magnetic field, we calculate the cloud evolution from the molecular cloud core (nc ≃ 10 4 cm, r = 4.6× 10 AU) to the stellar core (nc ≃ 10 22 cm, r ∼ 1R⊙), where nc and ...

Mergers are thought to be a fundamental channel for galaxy growth, perturbing the gas dynamics and magnetic fields (B-fields) in interstellar medium (ISM). However, mechanisms that amplify dissipate B-fields during merger remain unclear. We characterize morphology of ordered multi-phase ISM closest two spiral galaxies, Antennae galaxies. compare inferred using $154~\mu$m thermal dust $11$ cm ra...

The magnetohydrodynamic evolution of a dense spherical cloud as it interacts with a strong planar shock is studied, as a model for shock interactions with density inhomogeneities in the interstellar medium. The cloud is assumed to be small enough that radiative cooling, thermal conduction, and self-gravity can be ignored. A variety of initial orientations (including parallel, perpendicular, and...