J. A. Peacock
A5045208440- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Stellar, planetary, and galactic studies
- Radio Astronomy Observations and Technology
- Astrophysics and Cosmic Phenomena
- Scientific Research and Discoveries
- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- History and Developments in Astronomy
- Dark Matter and Cosmic Phenomena
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- Relativity and Gravitational Theory
- Astrophysical Phenomena and Observations
- Particle physics theoretical and experimental studies
- Geophysics and Gravity Measurements
- Gaussian Processes and Bayesian Inference
- Solar and Space Plasma Dynamics
- Space Science and Extraterrestrial Life
- Advanced Mathematical Theories and Applications
- Superconducting and THz Device Technology
- CCD and CMOS Imaging Sensors
- Black Holes and Theoretical Physics
- Computational Physics and Python Applications
Royal Observatory
2016-2025
University of Edinburgh
2016-2025
Edinburgh College
2024
University of Hull
2023
UK Astronomy Technology Centre
2001-2021
Institute of Astronomy
1999-2020
Maryland Institute College of Art
2017
Scottish Universities Physics Alliance
2007-2016
Roma Tre University
2015
National Centre for Nuclear Research
2015
The 2dF Galaxy Redshift Survey (2dFGRS) is designed to measure redshifts for approximately 250-000 galaxies. This paper describes the survey design, spectroscopic observations, redshift measurements and data base. 2dFGRS uses multifibre spectrograph on Anglo-Australian Telescope, which capable of observing 400 objects simultaneously over a 2° diameter field. source catalogue revised extended version APM galaxy catalogue, targets are galaxies with extinction-corrected magnitudes brighter than...
We present a power-spectrum analysis of the final 2dF Galaxy Redshift Survey (2dFGRS), employing direct Fourier method. The sample used comprises 221 414 galaxies with measured redshifts. investigate in detail modelling selection, improving on previous treatments number respects. A new angular mask is derived, based revisions to photometric calibration. redshift selection function determined by dividing survey according rest-frame colour, and deducing self-consistent treatment k-corrections...
We present the results of a large library cosmological N-body simulations, using power-law initial spectra. The nonlinear evolution matter power spectra is compared with predictions existing analytic scaling formulae based on work Hamilton et al. approach has assumed that highly structures obey `stable clustering' and are frozen in proper coordinates. Our show that, when transformed under self-similarity scaling, scale-free define locus clearly shallower than would be required stable...
Pan-STARRS1 has carried out a set of distinct synoptic imaging sky surveys including the $3π$ Steradian Survey and Medium Deep in 5 bands ($grizy_{P1}$). The mean 5$σ$ point source limiting sensitivities stacked 3$π$ $grizy_{P1}$ are (23.3, 23.2, 23.1, 22.3, 21.4) respectively. upper bound on systematic uncertainty photometric calibration across is 7-12 millimag depending bandpass. astrometric using Gaia frame comes from comparison results with Gaia: standard deviation median residuals ($...
The Galaxy And Mass Assembly (GAMA) survey has been operating since February 2008 on the 3.9-m Anglo-Australian Telescope using AAOmega fibre-fed spectrograph facility to acquire spectra with a resolution of R~1300 for 120,862 SDSS selected galaxies. target catalogue constitutes three contiguous equatorial regions centred at 9h (G09), 12h (G12) and 14.5h (G15) each 12 x 4 sq.deg limiting fluxes r < 19.4, 19.8, 19.4 mag respectively (and additional limits other wavelengths). Spectra reliable...
We present cosmological parameter constraints from a tomographic weak gravitational lensing analysis of ~450deg$^2$ imaging data the Kilo Degree Survey (KiDS). For flat $\Lambda$CDM cosmology with prior on $H_0$ that encompasses most recent direct measurements, we find $S_8\equiv\sigma_8\sqrt{\Omega_{\rm m}/0.3}=0.745\pm0.039$. This result is in good agreement other low redshift probes large scale structure, including cosmic shear results, along pre-Planck microwave background constraints. A...
zCOSMOS is a large-redshift survey that being undertaken in the COSMOS field using 600 hr of observation with VIMOS spectrograph on 8 m VLT. The designed to characterize environments galaxies from 100 kpc scales galaxy groups up Mpc scale cosmic web and produce diagnostic information active galactic nuclei. consists two parts: (1) zCOSMOS-bright, magnitude-limited I-band IAB < 22.5 sample about 20,000 0.1 z 1.2 covering whole 1.7 deg2 ACS field, for which parameters at ~ 0.7 are be directly...
The advent of sensitive sub-mm array cameras now allows a proper census dust-enshrouded massive star-formation in very distant galaxies, previously hidden activity to which even the faintest optical images are insensitive. We present deepest survey sky date, taken with SCUBA camera on James Clerk Maxwell Telescope and centred Hubble Deep Field. high source density found this image implies that is confusion-limited below flux 2 mJy. However, within central 80 arcsec radius independent...
We propose a heuristic model that displays the main features of realistic theories for galaxy bias. show low-order clustering statistics dark-matter distribution depend almost entirely on locations and density profiles haloes. A hypothetical catalogue depends (i) efficiency formation, as manifested by halo occupation number -- galaxies brighter than some sample limit contained in given mass; (ii) location these within their halo. The first factor is constrained empirical luminosity function...
We combine the Two Micron All Sky Survey (2MASS) Extended Source Catalogue and 2dF Galaxy Redshift to produce an infrared selected galaxy catalogue with 17 173 measured redshifts. use this extensive data set estimate luminosity functions in J- KS-bands. The are fairly well fitted by Schechter parameters MJ*−5 log h = −22.36±0.02, αJ −0.93±0.04, ΦJ* 0.0104±0.0016 h3 Mpc−3 J-band MKS*−5 −23.44±0.03, αKS −0.96±0.05, ΦKS* 0.0108±0.0016 KS-band (2MASS Kron magnitudes). These derived assuming a...
The 2dF Galaxy Redshift Survey has now measured in excess of 160-000 galaxy redshifts. This paper presents the power spectrum distribution, calculated using a direct Fourier transform based technique. We argue that, within k-space region , shape this should be close to that linear density perturbations convolved with window function survey. and its convolving effect on estimate are analysed detail. By model spectra, we able fit power-spectrum data provide measure matter content Universe. Our...
We introduce a method to constrain general cosmological models using Baryon Acoustic Oscillation (BAO) distance measurements from galaxy samples covering different redshift ranges, and apply this analyse drawn the Sloan Digital Sky Survey (SDSS) 2dF Galaxy Redshift (2dFGRS). BAOs are detected in clustering of combined 2dFGRS SDSS main samples, measure distance–redshift relation at z= 0.2. luminous red galaxies 0.35. The observed scales calculated these sample jointly analysed estimates...
We present a detailed analysis of the two-point correlation function, ξ(σ, π), from 2dF Galaxy Redshift Survey (2dFGRS). The large size catalogue, which contains ∼220 000 redshifts, allows us to make high-precision measurements various properties galaxy clustering pattern. effective redshift at our estimates are made is zs≈ 0.15, and similarly luminosity, Ls≈ 1.4L*. estimate redshift-space ξ(s), we measure length, s0= 6.82 ± 0.28 h−1 Mpc. also projected Ξ(σ), real-space ξ(r), can be fit by...
We present imaging data and photometry for the COSMOS survey in 15 photometric bands between 0.3 2.4 μm. These include taken on Subaru 8.3 m telescope, KPNO CTIO 4 telescopes, CFHT 3.6 telescope. Special techniques are used to ensure that relative calibration is better than 1% across field of view. The absolute accuracy from standard-star measurements found be 6%. corrected using galaxy spectra, providing colors accurate 2% or better. Stellar counts agree well with expected values. Finally,...
We describe an attempt to reconstruct the initial conditions for formation of cosmological large-scale structure, under assumption gravitational instability in a Gaussian density field. Information on power spectrum primordial fluctuations is provided by variety autocorrelation and cross-correlation analyses samples different classes galaxy clusters. These results differ from desired linear because three modifying effects: bias, non-linear evolution redshift-space distortions. show how...
Hamilton et al. have suggested an invaluable scaling formula which describes how the power spectra of density fluctuations evolve into non-linear regime hierarchical clustering. This paper presents extension their method to low-density universes and with non-zero cosmological constant. We pay particular attention models large negative spectral indices, give a spectrum-dependent fitting is significantly improved accuracy by comparison earlier version this work. The tendency effects increase...
view Abstract Citations (807) References (40) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Power-Spectrum Analysis of Three-dimensional Redshift Surveys Feldman, Hume A. ; Kaiser, Nick Peacock, John We develop a general method for power-spectrum analysis three- dimensional redshift surveys. present rigorous analytical estimates the statistical uncertainty in power, and we are able to derive optimal weighting scheme under reasonable (and largely empirically...
This paper deals with the techniques available to test for consistency between empirical distribution of data points on a plane and hypothetical density law. Two new statistical tests are developed. The first is two-dimensional version Kolmogorov–Smirnov test, which statistic investigated using Monte Carlo method. found in practice be very nearly distribution-free, formulae confidence levels given. Secondly, method power-spectrum analysis extended deal cases null hypothesis not uniform...
This paper describes the first catalogue of photometrically-derived stellar mass estimates for intermediate-redshift (z < 0.65) galaxies in Galaxy And Mass Assembly (GAMA) spectroscopic redshift survey. These masses, as well full set ancillary population parameters, will be made public part GAMA data release 2. Although database does include NIR photometry, we show that quality our synthesis fits is significantly poorer when these are included. Further, a large fraction galaxies, parameters...
We compute the bispectrum of 2dF Galaxy Redshift Survey (2dFGRS) and use it to measure bias parameter galaxies. This quantifies strength clustering galaxies relative mass in Universe. By analysing 80 × 106 triangle configurations wavenumber range 0.1 < k 0.5 h Mpc−1 (i.e. on scales roughly between 5 30 h−1 Mpc) we find that linear is consistent with unity: b1= 1.04 ± 0.11, quadratic (non-linear) zero: b2=−0.054 0.08. Thus, at least large scales, optically selected do indeed trace underlying...