Astronomical instrumentation

Research group

Research theme

Sub department

About

The current status of the UK-FMOS spectrograph

Society of Photo-Optical Instrumentation Engineers (SPIE) 5492 (2004) 1362-1370

Authors:

IA Tosh, GF Woodhouse, T Froud, A Dowell, M Patel, M Wallner, IJ Lewis, GB Dalton, A Holmes, B Brooks, C Band, DG Bonfield, GJ Murray, DJ Robertson, NA Dipper

The 2dF Galaxy Redshift Survey: the local E+A galaxy population

(2004)

Authors:

Chris Blake, Michael Pracy, Warrick Couch, Kenji Bekki, Ian Lewis, Karl Glazebrook, Ivan Baldry, Carlton Baugh, Joss Bland-Hawthorn, Terry Bridges, Russell Cannon, Shaun Cole, Matthew Colless, Chris Collins, Gavin Dalton, Roberto De Propris, Simon Driver, George Efstathiou, Richard Ellis, Carlos Frenk, Carole Jackson, Ofer Lahav, Stuart Lumsden, Steve Maddox, Darren Madgwick, Peder Norberg, John Peacock, Bruce Peterson, Will Sutherland, Keith Taylor
More details from the publisher

Multi-Object Near-IR H-alpha Spectroscopy of z~1 star-forming galaxies in the HDF-N

(2004)

Authors:

Michelle Doherty, Andrew Bunker, Robert Sharp, Gavin Dalton, Ian Parry, Ian Lewis, Emily MacDonald, Christian Wolf, Hans Hippelein
More details from the publisher

The 2dF Galaxy Redshift Survey: Higher-order galaxy correlation functions

Monthly Notices of the Royal Astronomical Society 352:4 (2004) 1232-1244

Authors:

DJ Croton, E Gaztañaga, CM Baugh, P Norberg, M Colless, LK Baldry, J Bland-Hawthorn, T Bridges, R Cannon, S Cole, C Collins, W Couch, G Dalton, R De Propris, SP Driver, G Efstathiou, RS Ellis, CS Frenk, K Glazebrook, C Jackson, O Lahav, I Lewis, S Lumsden, S Maddox, D Madgwick, JA Peacock, BA Peterson, W Sutherland, K Taylor

Abstract:

We measure moments of the galaxy count probability distribution function in the Two-degree Field Galaxy Redshift Survey (2dFGRS). The survey is divided into volume-limited subsamples in order to examine the dependence of the higher-order clustering on galaxy luminosity. We demonstrate the hierarchical scaling of the averaged p-point galaxy correlation functions, ξ̄p, up to p = 6. The hierarchical amplitudes, Sp = S2Sp-1, are approximately independent of the cell radius used to smooth the galaxy distribution on small to medium scales. On larger scales we find that the higher-order moments can be strongly affected by the presence of rare, massive superstructures in the galaxy distribution. The skewness S3 has a weak dependence on luminosity, approximated by a linear dependence on log luminosity. We discuss the implications of our results for simple models of linear and non-linear bias that relate the galaxy distribution to the underlying mass.
More details from the publisher

Estimating the bispectrum of the Very Small Array data

Monthly Notices of the Royal Astronomical Society 352:3 (2004) 887-902

Authors:

S Smith, G Rocha, A Challinor, RA Battye, P Carreira, K Cleary, RD Davies, RJ Davis, C Dickinson, R Genova-Santos, K Grainge, CM Gutiérrez, YA Hafez, MP Hobson, ME Jones, R Kneissl, K Lancaster, A Lasenby, JP Leahy, K Maisinger, GG Pooley, N Rajguru, R Rebolo, JA Rubiño-Martin, PS Molina, RDE Saunders, RS Savage, P Scott, A Slosar, AC Taylor, D Titterington, E Waldram, RA Watson

Abstract:

We estimate the bispectrum of the Very Small Array data from the compact and extended configuration observations released in 2002 December, and compare our results with those obtained from Gaussian simulations. There is a slight excess of large bispectrum values for two individual fields, but this does not appear when the fields are combined. Given our expected level of residual point sources, we do not expect these to be the source of the discrepancy. Using the compact configuration data, we put an upper limit of 5400 on the value of F NL, the non-linear coupling parameter, at 95 per cent confidence. We test our bispectrum estimator using non-Gaussian simulations with a known bispectrum, and recover the input values.
More details from the publisher