A5082633835- Astronomy and Astrophysical Research
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Gamma-ray bursts and supernovae
- Advanced Vision and Imaging
- Astronomical Observations and Instrumentation
- Astrophysics and Star Formation Studies
- Remote Sensing in Agriculture
- History and Developments in Astronomy
- Scientific Research and Discoveries
- Astrophysical Phenomena and Observations
- Adaptive optics and wavefront sensing
- Cosmology and Gravitation Theories
- Quantum Information and Cryptography
- Atmospheric and Environmental Gas Dynamics
- CCD and CMOS Imaging Sensors
- Atmospheric Ozone and Climate
- Molecular Communication and Nanonetworks
- Cultural Heritage Materials Analysis
- Radio Astronomy Observations and Technology
- Astro and Planetary Science
- Educational theories and practices
- Quantum Computing Algorithms and Architecture
McMaster University
2023-2025
The University of Western Australia
2019-2024
International Centre for Radio Astronomy Research
2019-2024
University of Chile
2023
Pontificia Universidad Católica de Chile
1984-2021
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 We introduce ProSpect, a generative galaxy spectral energy distribution (SED) package that encapsulates the best practices for SED methodologies in number of astrophysical domains. ProSpect comes with two popular families stellar population libraries (BC03 and EMILES), large variety methods to construct star formation metallicity histories. It models dust through use Charlot & Fall attenuation model, re-emission using Dale far-infrared templates. also has ability model active...
We present catalogues of stellar masses, star formation rates, and ancillary population parameters for galaxies spanning $0<z<9$ from the Deep Extragalactic VIsible Legacy Survey (DEVILS). DEVILS is a deep spectroscopic redshift survey with very high completeness, covering several premier fields including COSMOS (D10). Our mass rate estimates are self-consistently derived using spectral energy distribution (SED) modelling code ProSpect, well-motivated parameterisations dust attenuation,...
ABSTRACT We introduce version 2.0 of the shark semi-analytic model galaxy formation after many improvements to physics included. The most significant being (i) a describing exchange angular momentum (AM) between interstellar medium and stars; (ii) new active galactic nuclei feedback which has two modes, wind jet mode, with mode tied energy production; (iii) tracking development black hole (BH) spins; (iv) more sophisticated modelling environmental effects on satellite galaxies; (v) automatic...
We combine the Shark semi-analytic model of galaxy formation with ProSpect software tool for spectral energy distribution (SED) generation to study multi-wavelength emission galaxies from far-ultraviolet (FUV) far-infrared (FIR) at $0\le z\le 10$. produce a physical attenuation across cosmic time by combining local Universe empirical relation compute dust mass their gas metallicity and mass, curves derived radiative transfer calculations in EAGLE hydrodynamic simulation suite, properties...
We present SKiLLS, a suite of multi-band image simulations for the weak lensing analysis complete Kilo-Degree Survey (KiDS), dubbed KiDS-Legacy analysis. The resulting catalogues enable joint shear and redshift calibration, enhancing realism hence accuracy over previous efforts. To create large volume simulated galaxies with faithful properties to sufficient depth, we integrated cosmological high-quality imaging observations. also improved images by allowing point spread function (PSF)...
Active galactic nuclei (AGN) are typically identified through radio, mid-infrared, or X-ray emission the presence of broad and/or narrow lines. AGN can also leave an imprint on a galaxy's spectral energy distribution (SED) re-processing photons by dusty torus. Using SED fitting code ProSpect with incorporated component, we fit far ultraviolet to far-infrared SEDs $\sim$494,00 galaxies in D10-COSMOS field and $\sim$230,000 from GAMA survey. By combining component flexible star formation...
We study the mixing time of projected Langevin algorithm (LA) and privacy curve noisy Stochastic Gradient Descent (SGD), beyond nonexpansive iterations. Specifically, we derive new bounds for LA which are, in some important cases, dimension-free poly-logarithmic on accuracy, closely matching existing results smooth convex case. Additionally, establish upper subsampled SGD algorithm. These show a crucial dependency regularity gradients, are useful wide range losses Our analysis relies...
With the advent of wide-field cosmological surveys, samples hundreds thousands spectroscopically confirmed galaxy groups and clusters are becoming available. While these large datasets offer a valuable tool to trace baryonic matter distribution, controlling systematics in identification host dark-matter halos estimating their properties remains crucial. We intend evaluate predictions retrieving population cluster group galaxies using three group-detection methods on simulated dataset...
Cold molecular gas, largely traced by CO emission, is the primary fuel for star formation, making it essential understanding galaxy evolution. ALMA has made significant progress in study of cosmic evolution cold gas. Here, we exploit ALMACAL survey to address issues relating small sample sizes and variance, utilising calibration data from compile a statistically essentially unbiased CO-selected galaxies. By employing novel statistical approach emission-line classification using...
Cold molecular gas, largely traced by CO emission, is the primary fuel for star formation, making it essential understanding galaxy evolution. ALMA has made significant progress in study of cosmic evolution cold gas. Here, we exploit ALMACAL survey to address issues relating small sample sizes and variance, utilising calibration data from compile a statistically essentially unbiased CO-selected galaxies. By employing novel statistical approach emission-line classification using...
Abstract We investigate the internal and external mechanisms that regulate quench star formation (SF) in galaxies at z ∼ 0.3 using MAGPI observations eagle, Magneticum, IllustrisTNG cosmological simulations. Using SimSpin to generate mock of simulated galaxies, we match detection/resolution limits rates stellar mass, along with observational details including average point spread function pixel scale. While find a good agreement slope global star-forming main sequence (SFMS) between all...
Abstract Mergers are fundamental to our understanding of the processes driving evolution structure and morphology galaxies, star formation, AGN activity, redistribution stellar mass in Universe. Determining fraction properties mergers across cosmic time is critical formation Universe we observe today. This its also provide inputs constraints for cosmological simulations, crucial theoretical models galaxy evolution. We present robust estimates major close-pair fractions merger rates at 0.2...
The Deep Extragalactic VIsible Legacy Survey (DEVILS) is an ongoing high-completeness, deep spectroscopic survey of $\sim$60,000 galaxies to Y$<$21.2 mag, over $\sim$6 deg2 in three well-studied extragalactic fields: D10 (COSMOS), D02 (XMM-LSS) and D03 (ECDFS). Numerous DEVILS projects all require consistent, uniformly-derived state-of-the-art photometric data with which measure galaxy properties. Existing catalogues these regions either use varied measurement techniques for different...
ABSTRACT We use the Galaxy and Mass Assembly (GAMA) Deep Extragalactic Visible Legacy Survey (DEVILS) observational data sets to calculate cosmic star formation rate (SFR) active galactic nuclei (AGN) bolometric luminosity history (CSFH/CAGNH) over last 12.5 billion years. SFRs AGN luminosities were derived using spectral energy distribution fitting code ProSpect, which includes an prescription self-consistently model contribution from both stellar emission observed rest-frame ultra-violet...
ABSTRACT Measuring the H i–halo mass scaling relation (HIHM) is fundamental to understanding role of i in galaxy formation and its connection structure formation. While direct measurements haloes are possible using i-spectral stacking, reported shape depends on techniques used measure it (e.g. monotonically increasing with versus flat, mass-independent). Using a simulated optical survey produced shark semi-analytic model, we investigate how well different observational can recover intrinsic,...
ABSTRACT The time-scales on which galaxies move out of the blue cloud to red sequence ($\tau ^{}_\mathrm{Q}$ ) provide insight into mechanisms driving quenching. Here, we build upon previous work, where showcased a method reconstruct colour evolution observed low-redshift from Galaxy And Mass Assembly (GAMA) survey based spectral energy distribution (SED) fitting with ProSpect, together statistically driven definition for and populations. We also use predicted shark semi-analytic model,...
ABSTRACT We present a comprehensive study of the star formation histories massive-quenched galaxies at $z=3$ in three semi-analytical models (Shark, gaea, Galform) and cosmological hydrodynamical simulations (Eagle, IllustrisTNG, Simba). predicted number density stellar mass function galaxies, their quenching time-scales properties progenitors. Predictions are disparate all these diagnostics, for instance: (i) some reproduce observed very ($\gt 10^{11}\, \rm {\rm M}_{\odot }$) but...
ABSTRACT Galaxy spectral energy distributions (SEDs) remain among the most challenging yet informative quantities to reproduce in simulations due large and complex mixture of physical processes that shape radiation output a galaxy. With increasing number surveys utilizing broad-band colours as part their target selection criteria, production realistic SEDs is necessary for assisting survey design interpretation observations. The recent success reproducing observed luminosity functions (LFs)...
ABSTRACT Mapping the evolution of galaxy colours, from blue star forming to red passive systems, is fundamental understand processes involved in evolution. To this end, we reconstruct colour low-redshift galaxies, combining stellar templates with formation and metallicity histories galaxies Galaxy And Mass Assembly survey shark semi-analytical model. We use these robustly characterize populations over cosmic time. Using a Gaussian Mixture Model distribution at any given epoch mass, find both...
We introduce version 2.0 of the SHARK semi-analytic model galaxy formation after many improvements to physics included. The most significant being: (i) a describing exchange angular momentum (AM) between interstellar medium and stars; (ii) new active galactic nuclei feedback which has two modes, wind jet mode, with mode tied energy production; (iii) tracking development black hole (BH) spins; (iv) more sophisticated modelling environmental effects on satellite galaxies; (v) automatic...
We present the evolution of star-formation dispersion - stellar mass relation ($\sigma_{SFR}$-M$_{\star}$) in DEVILS D10 region using new measurements derived ProSpect spectral energy distribution fitting code. find that $\sigma_{SFR}$-M$_{\star}$ shows characteristic 'U-shape' at intermediate masses from 0.1<z<0.7 for a number metrics, including deconvolved intrinsic dispersion. A physical interpretation this is combination stochastic and feedback causing large scatter low AGN asymmetric...
This is a correction to Robotham et al. ( 2020 ), where unfortunately the mass function (x) massfunc snorm , i.e. skewed Normal star formation history) was incorrectly re-formatted during proofing: '5' added erroneously.Thank you co-author C. Lagos for noticing this error.The related equation 1) and 2) should appear as: SFR(age) = m SFR e X( age ) 2 (1) agem peak period skew asinh -m
We present a comprehensive study of the star formation histories massive-quenched galaxies at $z=3$ in 3 semi-analytic models (SHARK, GAEA, GALFORM) and cosmological hydrodynamical simulations (EAGLE, Illustris-TNG, Simba). predicted number density stellar mass function galaxies, their quenching timescales star-formation properties progenitors. Predictions are disparate all these diagnostics, for instance: (i) some reproduce observed very ($>10^{11}\rm M_{\odot}$) but underpredict high...
Wide-field cosmological surveys provide hundreds of thousands spectroscopically confirmed galaxy groups and clusters, valuable for tracing baryonic matter distribution. However, controlling systematics in identifying host dark halos estimating their properties is crucial. We evaluate three group detection methods on a simulated dataset replicating the GAMA selection to understand effects. This key interpreting data from SDSS, GAMA, DESI, WAVES, leveraging optical catalogues (X-ray) eROSITA...