9 research outputs found

    First Results from SPARO: Evidence for Large-Scale Toroidal Magnetic Fields in the Galactic Center

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    We have observed the linear polarization of 450 micron 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 region is permeated by large-scale toroidal magnetic fields. We consider our results together with radio observations that show evidence for poloidal fields in the Galactic center, and with Faraday rotation observations. We compare all of these observations with the predictions of a magnetodynamic model for the Galactic center that was proposed in order to explain the Galactic Center Radio Lobe as a magnetically driven gas outflow. We conclude that the observations are basically consistent with the model.Comment: 11 pages, 2 figures, 1 table, submitted to ApJ Let

    Measurement of the inclusive energy spectrum in the very forward direction in proton-proton collisions at root s=13 TeV

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    SOFIA and its facility Far Infrared Camera HAWC

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    The Stratospheric Observatory For Infrared Astronomy (SOFIA) is a 2.5 m telescope which will fly in a Boeing 747SP, commencing operation in late summer 2004. SOFIA is a joint American/German project and for most of this decade it will be the largest far-infrared telescope. SOFIA will have a suite of instruments available to the astronomical community, including the High-resolution Airborne Wide-band Camera (HAWC) - its facility far-infrared camera

    Operation of the Near Infrared Sky Monitor at the South Pole

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    The near infrared sky spectral brightness has been measured at the South Pole with the Near Infrared Sky Monitor (NISM) throughout the 2001 winter season. The sky is found to be typically more than an order of magnitude darker than at temperate latitude sites, consistent with previous South Pole observations. Reliable robotic operation of the NISM, a low power, autonomous instrument, has been demonstrated throughout the Antarctic winter. Data analysis yields a median winter value of the 2.4 m (K dark ) sky spectral brightness of arcsec -2 and an average of 210 80 Jy arcsec -2 . The 75%, 50%, and 25% quartile values are 270 30 Jy arcsec -2 , respectively

    Search for a standard model Higgs boson produced in association with a top-quark pair and decaying to bottom quarks using a matrix element method

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