Anthony Carr
A5008824747- Gamma-ray bursts and supernovae
- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- CCD and CMOS Imaging Sensors
- Astronomical Observations and Instrumentation
- Astrophysical Phenomena and Observations
- Dark Matter and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Delphi Technique in Research
- Remote Sensing in Agriculture
- Radio Astronomy Observations and Technology
- Impact of Light on Environment and Health
- Biomedical and Engineering Education
- Adaptive optics and wavefront sensing
- Geophysics and Gravity Measurements
- Advanced Fluorescence Microscopy Techniques
- Conferences and Exhibitions Management
- demographic modeling and climate adaptation
The University of Queensland
2020-2024
Institute for High Energy Physics
2024
Universidad de La Laguna
2024
Korea Astronomy and Space Science Institute
2024
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$_0=73.5\pm1.1$...
Here we present 1701 light curves of 1550 spectroscopically confirmed Type Ia supernovae (SNe Ia) that will be used to infer cosmological parameters as part the Pantheon+ SN analysis and SH0ES (Supernovae H0 for Equation State dark energy) distance-ladder analysis. This effort is one a series works perform an extensive review redshifts, peculiar velocities, photometric calibration, intrinsic-scatter models SNe Ia. The total number curves, which are compiled across 18 different surveys,...
Abstract A key component of the Dark Energy Spectroscopic Instrument (DESI) survey validation (SV) is a detailed visual inspection (VI) optical spectroscopic data to quantify metrics. In this paper we present results from VI quasar using deep coadded SV spectra. We show that majority (≈70%) main-survey targets are spectroscopically confirmed as quasars, with ≈16% galaxies, ≈6% stars, and ≈8% low-quality spectra lacking reliable features. nonnegligible fraction quasars misidentified by...
Abstract The Dark Energy Spectroscopic Instrument (DESI) Survey has obtained a set of spectroscopic measurements galaxies to validate the final survey design and target selections. To assist in these tasks, we visually inspect DESI spectra approximately 2500 bright galaxies, 3500 luminous red (LRGs), 10,000 emission-line (ELGs) obtain robust redshift identifications. We then utilize inspected information characterize performance operation. Based on visual inspection (VI) catalogs, our...
Abstract We present cosmological constraints from the sample of Type Ia supernovae (SNe Ia) discovered and measured during full 5 yr Dark Energy Survey (DES) SN program. In contrast to most previous samples, in which SNe are classified based on their spectra, we classify DES using a machine learning algorithm applied light curves four photometric bands. Spectroscopic redshifts acquired dedicated follow-up survey host galaxies. After accounting for likelihood each being an Ia, find 1635...
We present cosmological constraints from the sample of Type Ia supernovae (SN Ia) discovered during full five years Dark Energy Survey (DES) Supernova Program. In contrast to most previous samples, in which SN are classified based on their spectra, we classify DES SNe using a machine learning algorithm applied light curves four photometric bands. Spectroscopic redshifts acquired dedicated follow-up survey host galaxies. After accounting for likelihood each being Ia, find 1635 redshift range...
Abstract Separating the components of redshift due to expansion and peculiar motion in nearby universe ( z < 0.1) is critical for using Type Ia Supernovae (SNe Ia) measure Hubble constant H 0 ) equation-of-state parameter dark energy w ). Here, we study two dominant “motions” contributing velocities: large-scale, coherent-flow (CF) motions small-scale gravitationally associated galaxies deemed be a galaxy group. We use set 584 low- SNe from Pantheon+ sample, evaluate efficacy corrections...
Abstract We examine the redshifts of a comprehensive set published Type Ia supernovae, and provide combined, improved catalogue with updated redshifts. improve on original catalogues by using most up-to-date heliocentric redshift data available; ensuring all have uncertainty estimates; exact formulae to convert into Cosmic Microwave Background (CMB) frame; utilising an peculiar velocity model that calculates local motions in redshift-space more realistically accounts for external bulk flow...
We present the full Hubble diagram of photometrically-classified Type Ia supernovae (SNe Ia) from Dark Energy Survey supernova program (DES-SN). DES-SN discovered more than 20,000 SN candidates and obtained spectroscopic redshifts 7,000 host galaxies. Based on light-curve quality, we select 1635 photometrically-identified SNe with redshift 0.10$< z <$1.13, which is largest sample any single survey increases number known $z>0.5$ by a factor five. In companion paper, cosmological results...
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....
Abstract We present the full Hubble diagram of photometrically classified Type Ia supernovae (SNe Ia) from Dark Energy Survey supernova program (DES-SN). DES-SN discovered more than 20,000 SN candidates and obtained spectroscopic redshifts 7000 host galaxies. Based on light-curve quality, we select 1635 identified SNe with redshift 0.10 < z 1.13, which is largest sample any single survey increases number known > 0.5 by a factor 5. In companion paper, cosmological results combined 194...
Abstract We cross-check the Hubble Space Telescope (HST) Cepheid/Type Ia supernova (SN Ia) distance ladder, which yields most precise local H 0 , against early James Webb (JWST) subsamples (∼1/4 of HST sample) from SH0ES and CCHP, calibrated only with NGC 4258. find Cepheid distances agree well (∼1 σ ) all combinations methods, samples, telescopes. The comparisons explicitly include measurement uncertainty each method in 4258, an oft-neglected but dominant term. Mean differences are ∼0.03...
ABSTRACT We present a description of the Australian Dark Energy Survey (OzDES) and summarize results from its 6 years operations. Using 2dF fibre positioner AAOmega spectrograph on 3.9-m Anglo-Australian Telescope, OzDES has monitored 771 active galactic nuclei, classified hundreds supernovae, obtained redshifts for thousands galaxies that hosted transient within 10 deep fields Survey. also second data release, containing almost 30 000 sources, some as faint rAB = 24 mag, 375 individual...
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...
Measuring the growth rate of large-scale structures ($f$) as a function redshift has potential to break degeneracies between modified gravity and dark energy models, when combined with expansion-rate probes. Direct estimates peculiar velocities galaxies have gained interest estimate $f\sigma_8$. In particular, field-level methods can be used fit field nuisance parameter along cosmological parameters simultaneously. This article aims provide community an unified framework for theoretical...
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....
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....
Abstract We present high-resolution observations of nearby ( $z\lesssim0.1$ ) galaxies that have hosted Type Ia supernovae to measure systemic spectroscopic redshifts using the wide field spectrograph (WiFeS) instrument on Australian National University 2.3 m telescope at Siding Spring Observatory. While most targeted previous redshifts, we provide demonstrably more accurate and precise with competitive uncertainties, motivated by potential systematic errors could bias estimates Hubble...
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...
JWST provides new opportunities to cross-check the HST Cepheid/SNeIa distance ladder, which yields most precise local measure of H0. We analyze early subsamples (~1/4 sample) from SH0ES and CCHP groups, calibrated by a single anchor (N4258). find Cepheid distances agree well (~1 sigma) with all 8 combinations methods, samples, telescopes: Cepheids, TRGB, JAGB either group, plus TRGB Miras. The comparisons explicitly include measurement uncertainty each method in N4258, an oft-neglected but...
We present high-resolution observations of nearby ($z\lesssim 0.1$) galaxies that have hosted Type Ia supernovae to measure systemic spectroscopic redshifts using the Wide Field Spectrograph (WiFeS) instrument on Australian National University 2.3 m telescope at Siding Spring Observatory. While most targeted previous redshifts, we provide demonstrably more accurate and precise with competitive uncertainties, motivated by potential systematic errors could bias estimates Hubble constant...
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...