A5045427366- Galaxies: Formation, Evolution, Phenomena
- Astronomy and Astrophysical Research
- Stellar, planetary, and galactic studies
- Cosmology and Gravitation Theories
- Scientific Research and Discoveries
- Gamma-ray bursts and supernovae
- Adaptive optics and wavefront sensing
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Astronomical Observations and Instrumentation
- Radio Astronomy Observations and Technology
- CCD and CMOS Imaging Sensors
- Astrophysics and Star Formation Studies
- Remote Sensing in Agriculture
- Impact of Light on Environment and Health
- Astrophysical Phenomena and Observations
- Particle physics theoretical and experimental studies
- Gaussian Processes and Bayesian Inference
- High-Energy Particle Collisions Research
- Fashion and Cultural Textiles
- Advanced Statistical Methods and Models
- Particle Detector Development and Performance
- Plant Water Relations and Carbon Dynamics
- History and Developments in Astronomy
- Pulsars and Gravitational Waves Research
Durham University
2016-2025
Indiana Cancer Consortium
2005-2025
Universidad Nacional Autónoma de México
2025
International Federation of Gynaecology and Obstetrics
2023
John Wiley & Sons (United States)
2023
IP Australia
2022
University of the Arts London
2014-2016
Northern Illinois University
2014-2016
National Technical University of Athens
2016
European Organization for Nuclear Research
2015-2016
Recent observations of the distant Universe suggest that much stellar mass bright galaxies was already in place at z > 1. This presents a challenge for models galaxy formation because massive haloes are assembled late hierarchical clustering process intrinsic to cold dark matter (CDM) cosmology. In this paper, we discuss new implementation Durham semi-analytic model which feedback due active galactic nuclei (AGN) is assumed quench cooling flows haloes. mechanism naturally creates break local...
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 an analytical description of the merging virialized haloes which is applicable to any hierarchical model in structure grows via gravitational instability. The formulae are extension Press-Schechter model. dependence merger rate on halo mass, epoch, spectrum initial density fluctuations and parameter Ω0 explicitly quantified. calculate distribution formation times survival times. also describe a Monte Carlo method for constructing representative histories events leading prescribed...
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 describe the GALFORM semi-analytic model for calculating formation and evolution of galaxies in hierarchical clustering cosmologies. It improves upon, extends, earlier scheme developed by Cole et al. The employs a new Monte Carlo algorithm to follow merging dark matter haloes with arbitrary mass resolution. incorporates realistic descriptions density profiles gas they contain; it follows chemical stars, associated production dust; includes detailed calculation sizes discs spheroids....
view Abstract Citations (1683) References (23) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Excursion Set Mass Functions for Hierarchical Gaussian Fluctuations Bond, J. R. ; Cole, S. Efstathiou, G. Kaiser, N. It is pointed out that most schemes determining the mass function of virialized objects from statistics initial density perturbation field suffer cloud-in-cloud problem miscounting number low-mass clumps, many which would have been subsumed into...
We combine data from a number of N-body simulations to predict the abundance dark haloes in cold matter (CDM) universes over more than four orders magnitude mass. A comparison different suggests that dominant uncertainty our results is systematic and smaller 10–30 per cent at all masses, depending on halo definition used. In particular, 'Hubble volume' τCDM ΛCDM cosmologies allow massive clusters be predicted with uncertainties well below those expected currently planned observational...
DESI (Dark Energy Spectroscopic Instrument) is a Stage IV ground-based dark energy experiment that will study baryon acoustic oscillations (BAO) and the growth of structure through redshift-space distortions with wide-area galaxy quasar redshift survey. To trace underlying matter distribution, spectroscopic targets be selected in four classes from imaging data. We measure luminous red galaxies up to $z=1.0$. probe Universe out even higher redshift, target bright [O II] emission line $z=1.7$....
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 population of rich galaxy clusters evolves much more rapidly in a universe with critical density than low density. Thus, counts at intermediate redshift offer the possibility determining cosmological parameter, Ω0, minimum assumptions. We quantify this evolution using Press-Schechter formalism which we extend to flat models constant, Λ0 = 1 − Ω0 Using new large N-body simulations, verify that accurately predicts abundance as function various cosmologies. normalize by comparing them local...
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...
We investigate the physical mechanisms that shape luminosity function of galaxies in hierarchical clustering models. Beginning with mass dark matter halos ΛCDM (Λ cold matter) cosmology, we show, incremental steps, how gas cooling, photoionization at high redshift, feedback processes, galaxy merging, and thermal conduction affect function. consider three processes whereby supernovae stellar wind energy can forming galaxy: (1) reheating disk to halo temperature; (2) expansion hot, diffuse...
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...
The halo occupation distribution (HOD) describes the relation between galaxies and dark matter at level of individual halos. properties residing centers halos differ from those satellite because differences in their formation histories. Using a smoothed particle hydrodynamics (SPH) simulation semi-analytic (SA) galaxy model, we examine separate contributions central to HOD, more specifically probability P(N|M) that virial mass M contains N particular class. In agreement with earlier results...
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 a detailed prescription for the modelling of galaxy formation in hierarchical theories structure formation. Our model incorporates and merging dark matter haloes, shock heating radiative cooling baryonic gas gravitationally confined these star regulated by energy released evolving stars supernovae, galaxies within spectral evolution stellar populations that are formed. The procedure we describe is very flexible can be applied to any clustering theory. prescriptions mergers...
We use the Millennium Simulation (MS) to study statistics of LCDM halo concentrations at z = 0. Our results confirm that average concentration declines monotonically with mass; a power-law fits well concentration-mass relation for over 3 decades in mass, up most massive objects form universe (~ 10^15 h^-1 Msol). This is clear disagreement predictions model proposed by Bullock et al. these rare objects, and agrees better original Navarro, Frenk, & White. The large volume surveyed, together...
We present predictions for the abundance of submillimetre galaxies (SMGs) and Lyman-break (LBGs) in Λ cold dark matter cosmology. A key feature our model is self-consistent calculation absorption emission radiation by dust. The new successfully matches LBG luminosity function, as well reproducing properties local galaxy population optical infrared. can also explain observed number counts at 850 μm, but only if we assume a top-heavy initial mass function stars formed bursts. predicted...
We have made a detailed comparison of the results large N-body simulations with analytical description merging histories dark matter halos presented in Lacey & Cole 1993, which is based on an extension Press- Schechter method (Bond etal 1991,Bower 1991). find predictions for halo mass function, merger rates and formation times to be remarkably accurate. The model however expected apply arbitrary Omega general power spectra. Dark were identified using two different methods. For selected at...
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...
We use a set of large cosmological N-body simulations to study the internal structure dark matter haloes which form in scale-free models. find that radius r_178 corresponding mean interior overdensity 178 accurately delineates quasi-static halo from surrounding infalling material, agreement with simple spherical collapse model. The velocity dispersion correlates mass, again good Interior virial r_178, averaged density, circular and profiles are well fit by 2-parameter analytic model proposed...