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The discovery of a massive supercluster at z = 0.9 in the UKIDSS deep eXtragalactic survey

Monthly Notices of the Royal Astronomical Society 379:4 (2007) 1343-1351

Authors:

AM Swinbank, AC Edge, I Smail, JP Stott, M Bremer, Y Sato, C Van Breukelen, M Jarvis, I Waddington, L Clewley, J Bergeron, G Cotter, S Dye, JE Geach, E Gonzalez-Solares, P Hirst, RJ Ivison, S Rawlings, C Simpson, GP Smith, A Verma, T Yamada

Abstract:

We analyse the first publicly released deep field of the UK Infrared Deep Sky Survey (UKIDSS) Deep eXtragalactic Survey to identify candidate galaxy overdensities at z ∼ 1 across ∼1 deg2 in the ELAIS-N1 field. Using I - K, J - K and K - 3.6 μm colours, we identify and spectroscopically follow up five candidate structures with Gemini/Gemini Multi-Object Spectrograph and confirm that they are all true overdensities with between five and 19 members each. Surprisingly, all five structures lie in a narrow redshift range at z = 0.89 ± 0.01, although they are spread across 30 Mpc on the sky. We also find a more distant overdensity at z = 1.09 in one of the spectroscopic survey regions. These five overdense regions lying in a narrow redshift range indicate the presence of a supercluster in this field and by comparing with mock cluster catalogues from N-body simulations we discuss the likely properties of this structure. Overall, we show that the properties of this supercluster are similar to the well-studied Shapley and Hercules superclusters at lower redshift. © 2007 RAS.
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WFSPEC - A Multi-Object AO Instrument for the European Extremely Large Telescope

Optics Infobase Conference Papers (2007)

Authors:

G Moretto, JG Cuby, E Prieto, F Hammer, P Jagourel, G Rousset, T Fusco, J Devriendt

Abstract:

WFSPEC is a multi-integral field spectrograph instrument concept combining local AO correction over a wide field of view. This local correction is achieved by a multi object adaptive optics system integrated into the instrument. Instrument concept, development and preliminary results on performance simulations are discussed.

WFSPEC - a multi-object AO instrument for the European extremely large telescope

Optics InfoBase Conference Papers (2007)

Authors:

G Moretto, JG Cuby, E Prieto, F Hammer, P Jagourel, G Rousset, T Fusco, J Devriendt

Abstract:

WFSPEC is a multi-integral field spectrograph instrument concept combining local AO correction over a wide field of view. This local correction is achieved by a multi object adaptive optics system integrated into the instrument. Instrument concept, development and preliminary results on performance simulations are discussed. © 2007 Optical Society of America.
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A 6-12 GHz analogue lag-correlator for radio interferometry

ASTRONOMY & ASTROPHYSICS 464:2 (2007) 795-806

Authors:

CM Holler, T Kaneko, ME Jones, K Grainge, P Scott
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Coevolution of dark matter halos and black holes

ASTR SOC P 379 (2007) 273-275

Authors:

A Babic, L Miller, W Percival, S Croorn

Abstract:

We investigate a model of the coevolution of black holes and dark matter halos. The evolution of dark matter halos is based on the Press-Schechter theory. Assuming a simple relation between dark matter halos and supermassive black holes enables us to reproduce both the observed evolving hard X-ray luminosity function and the X-ray background.
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