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Bright Lyman-alpha Emitters at z~9: constraints on the luminosity function from HiZELS

(2009)

Authors:

D Sobral, PN Best, JE Geach, Ian Smail, J Kurk, M Cirasuolo, M Casali, RJ Ivison, K Coppin, GB Dalton
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The Monitor Project: a search for low mass EBs in the young open cluster M50

AIP Conference Proceedings AIP Publishing 1094:1 (2009) 832-835

Authors:

JL Birkby, ST Hodgkin, S Aigrain, J Irwin, Eric Stempels
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HiZELS: a high redshift survey of H-alpha emitters. II: the nature of star-forming galaxies at z=0.84

(2009)

Authors:

D Sobral, PN Best, JE Geach, Ian Smail, J Kurk, M Cirasuolo, M Casali, RJ Ivison, K Coppin, GB Dalton
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A digital broadband beamforming architecture for 2-PAD

Proceedings of Science 132 (2009) 273-277

Authors:

R Armstrong, J Hickish, KZ Adami, ME Jones

Abstract:

The development of densely-packed, all-digital aperture arrays is an important area of research required for the Square Kilometre Array (SKA) radio telescope. The design of real-time signal processing systems for digital aperture arrays is currently a central challenge in pathfinder projects worldwide. We describe an hierarchical, frequency-domain beamforming architecture for synthesising a sky beam from the wideband antenna feeds of digital aperture arrays. In particular this work describes a specific implementation of the beamforming architecture to the 2-Polarisation All-Digital (2-PAD) aperture array demonstrator.

AMI observations of northern supernova remnants at 14-18 GHz

Monthly Notices of the Royal Astronomical Society 396:1 (2009) 365-376

Authors:

N Hurley-Walker, AMM Scaife, DA Green, ML Davies, K Grainge, MP Hobson, ME Jones, T Kaneko, A Lasenby, G Pooley, RDE Saunders, PF Scott, D Titterington, E Waldram, JTL Zwart

Abstract:

We present observations between 14.2 and 17.9 GHz of 12 reported supernova remnants (SNRs) made with the Arcminute Microkelvin Imager Small Array (AMI SA). In conjunction with data from the literature at lower radio frequencies, we determine spectra of these objects. For well-studied SNRs (Cas A, Tycho's SNR, 3C 58 and the Crab Nebula), the results are in good agreement with spectra based on previous results. For the less well-studied remnants, the AMI SA observations provide higher-frequency radio observations than previously available, and better constrain their radio spectra. The AMI SA results confirm a spectral turnover at ≃11 GHz for the filled-centre remnant G74.9+1.2. We also see a possible steepening of the spectrum of the filled-centre remnant G54.1+0.3 within the AMI SA frequency band compared with lower frequencies. We confirm that G84.9+0.5, which had previously been identified as a SNR, is rather an H ii region and has a flat radio spectrum. © 2009 RAS.
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