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Radiation-hard optical link for SLHC

Journal of Physics Conference Series IOP Publishing 110:9 (2008) 092011

Authors:

KK Gan, B Abi, W Fernando, HP Kagan, RD Kass, A Law, MRM Lebbai, A Rau, F Rizardinova, PL Skubic, DS Smith
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Detecting the B-mode Polarisation of the CMB with Clover

ArXiv e-prints (2008)

Authors:

CE North, BR Johnson, PAR Ade, MD Audley, C Baines, RA Battye, ML Brown, P Cabella, PG Calisse, AD Challinor, WD Duncan, PG Ferreira, WK Gear, D Glowacka, DJ Goldie, PK Grimes, M Halpern, V Haynes, GC Hilton, KD Irwin, ME Jones, AN Lasenby, PJ Leahy, J Leech, B Maffei, P Mauskopf, SJ Melhuish, D O Dea, SM Parsley, L Piccirillo, G Pisano, CD Reintsema, G Savini, R Sudiwala, D Sutton, AC Taylor, G Teleberg, D Titterington, V Tsaneva, C Tucker, R Watson, S Withington, G Yassin, J Zhang
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Implementation of an optimized Cassegrain system for radio telescopes

Monthly Notices of the Royal Astronomical Society 384:3 (2008) 1207-1210

Authors:

CM Holler, RE Hills, ME Jones, K Grainge, T Kaneko

Abstract:

We present the antenna design for a radio interferometer, the Arcminute Microkelvin Imager, together with its beam pattern measurement. Our aim was to develop a low-cost system with high aperture efficiency and low ground spill across the frequency range 12-18 GHz. We use a modified Cassegrain system consisting of a commercially available paraboloidal primary mirror with a diameter of 3.7 m, and a shaped secondary mirror. The secondary mirror is oversized with respect to a ray optics design and has a surface that is bent towards the primary near its outer edge using a square term for the shaping. The antennas are simple to manufacture and therefore their cost is low. The design increased the antenna gain by approximately 10 per cent compared to a normal Cassegrain system while still maintaining low contamination from ground spill and using a simple design for the horn. © 2008 RAS.
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MASH-II: more planetary nebulae from the AAO/UKST Hα survey

Monthly Notices of the Royal Astronomical Society Oxford University Press (OUP) 384:2 (2008) 525-534

Authors:

Brent Miszalski, QA Parker, A Acker, JL Birkby, DJ Frew, A Kovacevic
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The Central Region of M83

ArXiv 0801.1213 (2008)

Authors:

RCW Houghton, N Thatte

Abstract:

We combine VLT/ISAAC NIR spectroscopy with archival HST/WFPC2 and HST/NICMOS imaging to study the central 20"x20" of M83. Our NIR indices for clusters in the circumnuclear star-burst region are inconsistent with simple instantaneous burst models. However, models of a single burst dispersed over a duration of 6 Myrs fit the data well and provide the clearest evidence yet of an age gradient along the star forming arc, with the youngest clusters nearest the north-east dust lane. The long slit kinematics show no evidence to support previous claims of a second hidden mass concentration, although we do observe changes in molecular gas velocity consistent with the presence of a shock at the edge of the dust lane.
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