A5056951415- Gamma-ray bursts and supernovae
- Stellar, planetary, and galactic studies
- Galaxies: Formation, Evolution, Phenomena
- Astrophysics and Cosmic Phenomena
- Astronomy and Astrophysical Research
- Cosmology and Gravitation Theories
- Radio Astronomy Observations and Technology
- Astronomical Observations and Instrumentation
- Atomic and Subatomic Physics Research
- Astrophysical Phenomena and Observations
- Inorganic Fluorides and Related Compounds
- Advanced NMR Techniques and Applications
- Echinoderm biology and ecology
- Ocean Acidification Effects and Responses
- Space Exploration and Technology
- Space Science and Extraterrestrial Life
- SAS software applications and methods
- Molecular Spectroscopy and Structure
- Speech and Audio Processing
- Astrophysics and Star Formation Studies
- Acoustic Wave Resonator Technologies
- GaN-based semiconductor devices and materials
- Antenna Design and Analysis
- Particle physics theoretical and experimental studies
- Food Industry and Aquatic Biology
Australian National University
2021-2024
University of Otago
2023
University of Auckland
2016-2017
Clemson University
2013
Jungwon University
2013
Yonsei University
2013
University of Rhode Island
2013
Vale (Brazil)
2013
University of New Mexico
2001
UK Astronomy Technology Centre
1998
The Binary Population and Spectral Synthesis (BPASS) suite of binary stellar evolution models synthetic populations provides a framework for the physically motivated analysis both integrated light from distant detailed properties those nearby. We present new version 2.1 data release these models, detailing methodology by which BPASS incorporates mass transfer its effect on pathways, as well construction simple populations. demonstrate key tests latest model demonstrating ability to reproduce...
We present constraints on cosmological parameters from the Pantheon+ analysis of 1701 light curves 1550 distinct Type Ia supernovae (SNe Ia) ranging in redshift $z=0.001$ to 2.26. This work features an increased sample size, span, and improved treatment systematic uncertainties comparison original Pantheon results a factor two improvement constraining power. For Flat$\Lambda$CDM model, we find $\Omega_M=0.334\pm0.018$ SNe alone. Flat$w_0$CDM measure $w_0=-0.90\pm0.14$ alone, H$_0=73.5\pm1.1$...
Abstract We present a recalibration of the photometric systems in Pantheon+ sample Type Ia supernovae (SNe Ia) including those SH0ES distance-ladder measurement H 0 . utilize large and uniform sky coverage public Pan-STARRS stellar photometry catalog to cross calibrate against tertiary standards released by individual SN surveys. The most significant updates over “SuperCal” calibration used for previous Pantheon analyses are: (1) expansion number (now 25) filters 105), (2) solving all filter...
ABSTRACT We report constraints on a variety of non-standard cosmological models using the full 5-yr photometrically classified type Ia supernova sample from Dark Energy Survey (DES-SN5YR). Both Akaike Information Criterion (AIC) and Suspiciousness calculations find no strong evidence for or against any we explore. When combined with external probes, AIC agree that 11 15 are moderately preferred over Flat-$\Lambda$CDM suggesting additional flexibility in our may be required beyond constant....
Cosmological analyses with type Ia supernovae (SNe Ia) often assume a single empirical relation between color and luminosity ($\beta$) do not account for varying host-galaxy dust properties. However, from studies of in large samples galaxies, it is known that attenuation can vary significantly. Here we take advantage state-of-the-art modeling galaxy properties to characterize parameters (dust $A_V$, parameter describing the law slope $R_V$) Dark Energy Survey (DES) SN host galaxies using...
Reverberation mapping measurements have been used to constrain the relationship between size of broad-line region and luminosity active galactic nuclei (AGN). This $R-L$ relation is estimate single-epoch virial black hole masses, has proposed for use standardise AGN determine cosmological distances. We present reverberation made with H$\beta$ from six-year Australian Dark Energy Survey (OzDES) Mapping Program. successfully recover lags eight at $0.12<z< 0.71$, probing higher redshifts than...
ABSTRACT For the past decade, SALT2 has been most common model used to fit Type Ia supernova (SN Ia) light curves for dark energy analyses. Recently, SALT3 was released, which upgraded a number of features but not yet measurements energy. Here, we evaluate impact switching from SN cosmology analysis. We train and on an identical training sample 1083 well-calibrated supernovae, ensuring that any differences found come underlying framework. publicly release results this (the SALT ‘surfaces’)....
Abstract At the low-redshift end ( z < 0.05) of Hubble diagram with Type Ia Supernovae (SNe Ia), contribution to residual scatter from peculiar velocities (PVs) is similar size that due limitations standardization SN light curves. A way improve redshift measurement host galaxy utilize average group, effectively averaging over small-scale/intracluster PVs. One limiting factor fraction galaxies in groups, previously found be 30% using (relatively incomplete) magnitude-limited catalogs....
Current and future cosmological analyses with Type Ia Supernovae (SNe Ia) face three critical challenges: i) measuring redshifts from the supernova or its host galaxy; ii) classifying SNe without spectra; iii) accounting for correlations between properties of their galaxies. We present here a novel approach that addresses each challenge. In context Dark Energy Survey (DES), we analyze SNIa sample galaxies in redMaGiC galaxy catalog, selection Luminous Red Galaxies. Photo-$z$ estimates these...
view Abstract Citations (98) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Pinpointing the Center of Activity in Compact Symmetric Objects. I. Sources from Pearson-Readhead Survey Taylor, G. B. ; Readhead, A. C. S. Pearson, T. J. We use multifrequency, multiepoch VLBA observations to pinpoint center activity (or "core") five compact symmetric objects (CSOs) and one candidate CSO sample. provide a first identification core component two...
Cosmological analyses of samples photometrically-identified Type Ia supernovae (SNe Ia) depend on understanding the effects 'contamination' from core-collapse and peculiar SN events. We employ a rigorous analysis state-of-the-art simulations photometrically identified determine cosmological biases due to such 'non-Ia' contamination in Dark Energy Survey (DES) 5-year sample. As part analysis, we test our DES performance SuperNNova, photometric classifier based recurrent neural networks....
We present a revised SALT2 surface (`SALT2-2021') for fitting the light curves of Type Ia supernovae (SNe Ia), which incorporates new measurements zero-point calibration offsets and Milky Way extinction. The most notable change in occurs UV region. This alters distance SNe~Ia, can be used to investigate nature dark energy by probing expansion history Universe. Using on public data from first three years Dark Energy Survey Supernova Program (combined with an external low-$z$ SNe sample)...
We present constraints on cosmological parameters from the Pantheon+ analysis of 1701 light curves 1550 distinct Type Ia supernovae (SNe Ia) ranging in redshift $z=0.001$ to 2.26. This work features an increased sample size, span, and improved treatment systematic uncertainties comparison original Pantheon results a factor two improvement constraining power. For Flat$Λ$CDM model, we find $Ω_M=0.334\pm0.018$ SNe alone. Flat$w_0$CDM measure $w_0=-0.90\pm0.14$ alone, H$_0=73.5\pm1.1$ km...
ABSTRACT Type Ia supernova (SN Ia) cosmology analyses include a luminosity step function in their distance standardization process to account for an observed yet unexplained difference the post-standardization luminosities of SNe originating from different host galaxy populations [e.g. high-mass ($M \gtrsim 10^{10} \, {\rm M}_{\odot }$) versus low-mass galaxies]. We present novel method including host-mass correlations SALT3 (Spectral Adaptive Light curve Template 3) light model used...
As the climate continues to change, it is not just magnitude of these changes that important - equally critical timing events. Conditions may be well tolerated at one time can become detrimental if experienced another, as a result seasonal acclimation. Temperature most variable affects aspects an organism's physiology. To address this, we quantified arm regeneration and respiration in Australian brittle star Ophionereis schayeri for 10 weeks response +3°C warming (18.5°C, simulating winter...
We present here a re-calibration of the photometric systems used in Pantheon+ sample Type Ia supernovae (SNe Ia) including those for SH0ES distance-ladder measurement H$_0$. utilize large and uniform sky coverage public Pan-STARRS stellar photometry catalog to cross-calibrate against tertiary standards released by individual SN surveys. The most significant updates over `SuperCal' cross-calibration previous Pantheon analyses are: 1) expansion number (now 25) filters 105), 2) solving all...
At the low-redshift end ($z<0.05$) of Hubble diagram with Type Ia Supernovae (SNe Ia), contribution to residual scatter from peculiar velocities is similar size that due limitations standardization SN light curves. A way improve redshift measurement host galaxy utilize average group, effectively averaging over small-scale/intracluster velocities. One limiting factor fraction galaxies in groups, previously found be 30% using (relatively incomplete) magnitude-limited catalogs. Here, we do...
We have observed the BL Lac object Markarian 501 at 1.4 GHz with High Sensitivity Array and 86 global VLBI mm array. Thanks to great resolution sensitivity provided by these instruments, we probe regions of radio jets never accessed before. The new data allow us map one-sided jet large distances from core, constrain properties thanks high counter-jet brightness ratio. give a image nuclear region. Putting together results available published discuss this source sub-parsec kiloparsec scales.
Abstract We have recently released version 2.0 of the Binary Population and Spectral Synthesis (BPASS) population synthesis code. This is designed to construct spectra related properties stellar populations built from ~200,000 detailed, individual models known age metallicity. The output products enable a broad range theoretical predictions for stars, binaries, resolved unresolved populations, supernovae their progenitors, compact remnant mergers. Here we summarise key applications that...
Computational Intelligence Applications in Smart Grid (CIASG)Computational (CI) evolves computational models and tools of intelligence capable handling large raw numerical sensory data directly, processing them by exploiting the representational parallelism pipelining problem, generating reliable just-in-time responses, having high fault tolerance.Smart grid is basically embedding to enable bidirectional power flows with traditional sources generation, renewable energy storage.CI deployment...