A5050972818- Galaxies: Formation, Evolution, Phenomena
- Cosmology and Gravitation Theories
- Astronomy and Astrophysical Research
- Statistical and numerical algorithms
- Stellar, planetary, and galactic studies
- Advanced Statistical Methods and Models
- Geological Studies and Exploration
- Reservoir Engineering and Simulation Methods
- Scientific Research and Discoveries
- History and Developments in Astronomy
- Radio Astronomy Observations and Technology
- Black Holes and Theoretical Physics
- Gamma-ray bursts and supernovae
Swinburne University of Technology
2021-2024
The University of Western Australia
2020-2022
International Centre for Radio Astronomy Research
2020-2022
In Galaxy And Mass Assembly Data Release 4 (GAMA DR4), we make available our full spectroscopic redshift sample. This includes 248682 galaxy spectra, and, in combination with earlier surveys, results 330542 redshifts across five sky regions covering ~250deg^2. The density, is the highest over such a sustained area, has exceptionally high completeness (95 per cent to r_KIDS=19.65mag), and well suited for study of mergers, groups, low (z<0.25) population. DR4 32 value-added tables or...
ABSTRACT The Galaxy And Mass Assembly Survey (GAMA) covers five fields with highly complete spectroscopic coverage (&gt;95 per cent) to intermediate depths (r &lt; 19.8 or i 19.0 mag), and collectively spans 250 deg2 of equatorial southern sky. Four the GAMA (G09, G12, G15, G23) reside in European Southern Observatory (ESO) VST KiDS ESO VISTA VIKING survey footprints, which combined our GALEX, WISE, Herschel data provide deep uniform imaging...
Galaxy peculiar velocities provide an integral source of cosmological information that can be harnessed to measure the growth rate large scale structure and constrain possible extensions General Relativity. In this work, we present a method for extracting contained within galaxy through ensemble direct velocity clustering correlation statistics, including effects redshift space distortions, using data from 6-degree Field Survey. Our compares auto- cross-correlation function multipoles these...
The detailed nature of dark energy remains a mystery, leaving the possibility that its effects might be explained by changes to laws gravity on large scales. peculiar velocities galaxies directly trace strength cosmic scales and provide means further constrain such models. We generate constraints different scenarios gravitational physics measuring velocity galaxy clustering two-point correlations, using redshifts distances from 6-degree Field Galaxy Survey Sloan Digital Sky Peculiar Velocity...
We present an improved framework for estimating the growth rate of large-scale structure, using measurements galaxy-velocity cross-correlation in configuration space. consider standard estimators velocity auto-correlation function, $\psi_1$ and $\psi_2$, two-point galaxy correlation $\xi_{gg}$, introduce a new estimator $\psi_3$. By including pair counts measured from random catalogues velocities positions sampled distributions characteristic true data, we find that variance function is...
ABSTRACT Measurements of the peculiar velocities large samples galaxies enable new tests standard cosmological model, including determination growth rate cosmic structure that encodes gravitational physics. With size such now approaching hundreds thousands galaxies, complex statistical analysis techniques and models are required to extract information. In this paper, we summarize how correlation functions between galaxy velocities, with surrounding large-scale structure, may be utilized test...
ABSTRACT The local galaxy peculiar velocity field can be reconstructed from the surrounding distribution of large-scale structure and plays an important role in calibrating cosmic growth expansion measurements. In this paper, we investigate effect stochasticity these reconstructions on statistical systematic errors cosmological inferences. By introducing a simple model between measured theoretical velocities, whose terms calibrate linear theory, derive bias velocity. We then use lognormal...
ABSTRACT The theoretical basis of dark energy remains unknown and could signify a need to modify the laws gravity on cosmological scales. In this study, we investigate how clustering motions galaxies can be used as probes modified theories, using galaxy direct peculiar velocity auto- cross-correlation functions. We measure fit these correlation functions in simulations ΛCDM, DGP, f(R) cosmologies and, by extracting characteristic parameters each model, show that theories distinguished from...
Joint analyses of the large-scale distribution galaxies, and their motions under gravitational influence this density field, allow powerful tests cosmological model, including measurement growth rate cosmic structure. In paper we perform a statistical comparison between two important classes method for performing these tests. first measure 2-point power spectra velocity tracers, jointly fit statistics using theoretical models. second use tracers to reconstruct model field through space,...
The local galaxy peculiar velocity field can be reconstructed from the surrounding distribution of large-scale structure and plays an important role in calibrating cosmic growth expansion measurements. In this paper, we investigate effect stochasticity these reconstructions on statistical systematic errors cosmological inferences. By introducing a simple model between measured theoretical velocities, whose terms calibrate linear theory, derive bias velocity. We then use lognormal...
Measurements of the peculiar velocities large samples galaxies enable new tests standard cosmological model, including determination growth rate cosmic structure that encodes gravitational physics. With size such now approaching hundreds thousands galaxies, complex statistical analysis techniques and models are required to extract information. In this paper we summarise how correlation functions between galaxy velocities, with surrounding large-scale structure, may be utilised test models....