118411010
O/IR Polarimetry for the 2010 Decade (CGT): Science at the Edge, Sharp Tools for All
Andy Adamson B-G Andersson UKIRT, JAC, Hilo Stratospheric Observatory for Infrared Astronomy Karen Bjorkman Ryan Chornock Dan Clemens University of Toledo University of California, Berkeley Boston University James De Buizer Nicholas M. Elias II SOFIA, NASA Ames Universitat Heidelberg; MPIA Richard Ignace East Tennessee State University Terry Jay Jones University of Minnesota Alexander Lazarian Douglas C. Leonard University of Wisconsin San Diego State University Antonio Mario Magalhaes University of Sao Paulo, Brazil Marshall Perrin UCLA Claudia Vilega Rodrigues Inst. Nac. De Pesquisas Espaciais, Brazil Hiroko Shinnaga CalTech William Sparks Lifan Wang STScI Texas A&M University Lead Authors: Jennifer L. Hoffman Physics and Astronomy University of Denver 2112 E. Wesley Ave. Denver, CO 80208 (303) 871–2268 jennifer.hoffman@du.edu Dean C. Hines Space Science Institute New Mexico Office 405 Alamos Rd. Corrales, NM 87048 (505) 239-6762 hines@spacescience.edu star
59043366
Understanding polarized foreground from dust: Towards reliable measurements of CMB polarization
White Paper to the Cosmology and Fundamental Physics (GCT) Science Frontiers Panel of the Astro2010 Decadal Survey.
15204601
The Magnetic Field Geometry in DR 21
We present broadband imaging polarimetry of DR 21 at 2.2 μm. Background stars shining through the lobes of the bipolar outflow show polarization aligned with the long axis of the outflow, indicating a magnetic field geometry oriented along the flow axis. There is no indication of a spiral or turbulent magnetic field geometry in the lobes. The polarization of stars in the central cluster has a different position angle than the lobes and is in good agreement with millimeter polarimetry. The nebulosity in the eastern lobe has moderate to high polarization, consistent with scattering of continuum light from the central cluster. We were unable to detect polarization of the nebulosity in the western lobe at the 4.2% (3 σ) level.
121397034
Star formation in the Magellanic Clouds – III. IR observations of giant H II regions
118411010
O/IR Polarimetry for the 2010 Decade (CGT): Science at the Edge, Sharp Tools for All
Andy Adamson B-G Andersson UKIRT, JAC, Hilo Stratospheric Observatory for Infrared Astronomy Karen Bjorkman Ryan Chornock Dan Clemens University of Toledo University of California, Berkeley Boston University James De Buizer Nicholas M. Elias II SOFIA, NASA Ames Universitat Heidelberg; MPIA Richard Ignace East Tennessee State University Terry Jay Jones University of Minnesota Alexander Lazarian Douglas C. Leonard University of Wisconsin San Diego State University Antonio Mario Magalhaes University of Sao Paulo, Brazil Marshall Perrin UCLA Claudia Vilega Rodrigues Inst. Nac. De Pesquisas Espaciais, Brazil Hiroko Shinnaga CalTech William Sparks Lifan Wang STScI Texas A&M University Lead Authors: Jennifer L. Hoffman Physics and Astronomy University of Denver 2112 E. Wesley Ave. Denver, CO 80208 (303) 871–2268 jennifer.hoffman@du.edu Dean C. Hines Space Science Institute New Mexico Office 405 Alamos Rd. Corrales, NM 87048 (505) 239-6762 hines@spacescience.edu star
119276302
DUST IN COMET C/2007 N3 (LULIN)
We report optical imaging, optical and near-infrared polarimetry, and Spitzer mid-infrared spectroscopy of comet C/2007 N3 (Lulin). Polarimetric observations were obtained in R (0.676 μm) at phase angles from 044 to 21° with simultaneous observations in H (1.65 μm) at 40, exploring the negative branch in polarization. Comet C/2007 N3 (Lulin) shows a typical negative polarization in the optical as well as a similar negative branch at near-infrared wavelengths. The 10 μm silicate feature is only weakly in emission and, according to our thermal models, is consistent with emission from a mixture of silicate and carbon material. We argue that large, low-porosity (akin to ballistic particle cluster aggregates), rather absorbing aggregate dust particles best explain both the polarimetric and the mid-infrared spectral energy distribution.
117875651
Studies of P Wave Charm Meson Production at LEP with the OPAL Detector
108832091
The microdot gas avalanche chamber: an investigation of new geometries
Abstract The gains of the microstrip and microgap gas avalanche chambers are limited to below gains of 5 × 10 3 by geometrical and gas properties. In order to increase the maximum gain to greater than 2 × 10 4 a new detector geometry, the microdot, is proposed that can be produced at a standard silicon MOS microfabrication facility at similar cost to present microstrip gas detectors. In addition to charged particle tracking, the new geometry is also well suited to imaging applications. The operating characteristics of the new device have been investigated using a numerical simulation and a comparison with conventional strip geometries is presented. These results show that the microdot geometry reaches higher gas gains than the strip-like geometries, for the same set of electrode potentials, with a reduced cathode electric field enhancing operational stability.
119900272
The construction of the ATLAS semi-conductor tracker
Abstract The ATLAS (A Toroidal LHC ApparatuS) experiment at the Large Hadron Collider (LHC) at CERN has been designed to explore physics at the TeV energy scale and will be commissioned in 2007. In the innermost region of the experiment is a charged particle tracker, the Inner Detector of which the Semiconductor Tracker (SCT) is a major component. The SCT comprises a central barrel section enclosed by two endcaps (A and C). The construction of the major components of the ATLAS Semi-conductor tracker (SCT) is now nearing completion. Following a brief description of the design of the SCT, the logistics and organisation of the construction phase of the project are discussed. Central to the delivery of a high quality detector is the testing of large numbers of modules both during assembly and after they are mounted on their final support structures. The results of these tests for endcap C are presented showing that the electrical performance of the 988 modules to be installed in ATLAS is compatible with the specifications required.
114549808
Development of gas micro-strip chambers for radiation detection and tracking at high rates