P. Wiseman
A5037740839- 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
- Astrophysical Phenomena and Observations
- SAS software applications and methods
- Astronomical Observations and Instrumentation
- Pulsars and Gravitational Waves Research
- Adaptive optics and wavefront sensing
- Astrophysics and Star Formation Studies
- CCD and CMOS Imaging Sensors
- Radio Astronomy Observations and Technology
- Dark Matter and Cosmic Phenomena
- Geophysics and Gravity Measurements
- Advanced Research in Systems and Signal Processing
- Statistical and numerical algorithms
- Astro and Planetary Science
- Scientific Research and Discoveries
- Advanced Power Generation Technologies
- Impact of Light on Environment and Health
- Gaussian Processes and Bayesian Inference
- Solar and Space Plasma Dynamics
- Neutrino Physics Research
University of Southampton
2018-2025
Ludwig-Maximilians-Universität München
2024
Lancaster University
2024
Centre National de la Recherche Scientifique
2024
Aix-Marseille Université
2024
Austin Peay State University
2024
University of Zurich
2024
American Public University System
2024
Stanford University
2024
Oak Ridge National Laboratory
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$_0=73.5\pm1.1$...
ABSTRACT We measure the current expansion rate of Universe, Hubble’s constant $H_0$, by calibrating absolute magnitudes supernovae to distances measured baryon acoustic oscillations (BAO). This ‘inverse distance ladder’ technique provides an alternative using nearby measurements, replacing calibration with a high-redshift anchor. use recent release 1829 from Dark Energy Survey spanning $0.01\lt z\lt 1.13$ anchored oscillation measurements Spectroscopic Instrument (DESI) $0.30 \lt...
We present the results of a search for rapidly evolving transients in Dark Energy Survey Supernova Programme. These events are characterized by fast light-curve evolution (rise to peak ≲10 d and exponential decline ≲30 after peak). discovered 72 events, including 37 with spectroscopic redshift from host galaxy spectral features. The increase total number rapid optical more than factor two. They found at wide range redshifts (0.05 < |$z$| 1.56) brightnesses (−15.75 > Mg −22.25). multiband...
We present improved photometric measurements for the host galaxies of 206 spectroscopically confirmed type Ia supernovae discovered by Dark Energy Survey Supernova Program (DES-SN) and used in first DES-SN cosmological analysis. Fitting spectral energy distributions to $griz$ galaxies, we derive stellar masses star-formation rates. For sample, when considering a 5D ($z$, $x_1$, $c$, $α$, $β$) bias correction, find evidence Hubble residual `mass step', where SNe high mass ($>10^{10}...
We present a sample of 21 hydrogen-free superluminous supernovae (SLSNe-I), and one hydrogen-rich SLSN (SLSN-II) detected during the five-year Dark Energy Survey (DES). These SNe, located in redshift range 0.220<z<1.998, represent largest homogeneously-selected events at high redshift. observed g,r, i, z light curves for these which we interpolate using Gaussian Processes. The resulting are analysed to determine luminosity function SLSN-I, their evolutionary timescales. DES SLSN-I...
The many unusual properties of the enigmatic AT2018cow suggested that at least some subset empirical class fast blue optical transients (FBOTs) represents a genuinely new astrophysical phenomenon. Unfortunately, intrinsic rarity and fleeting nature these events have made it difficult to identify additional examples early enough acquire observations necessary constrain theoretical models. We present here Zwicky Transient Facility discovery AT2020xnd (ZTF20acigmel, "Camel") z=0.243, first...
Type Ia supernovae (SNe Ia) are more precise standardizable candles when measured in the near-infrared (NIR) than optical. With this motivation, from 2012-2017 we embarked on RAISIN program with Hubble Space Telescope (HST) to obtain rest-frame NIR light curves for a cosmologically distant sample of 37 SN ($0.2 \lesssim z 0.6$) discovered by Pan-STARRS and Dark Energy Survey. By comparing higher-$z$ HST data 42 at $z<0.1$ observed Carnegie Supernova Project, construct diagram observations...
We present a measurement of the cross-correlation between MagLim galaxies selected from Dark Energy Survey (DES) first three years observations (Y3) and cosmic microwave background (CMB) lensing Atacama Cosmology Telescope (ACT) Data Release 4 (DR4), reconstructed over $\sim 436$ sq.deg. sky. Our galaxy sample, which covers 4143$ sq.deg., is divided into six redshift bins spanning range $0.20<z<1.05$. adopt blinding procedure until passing all consistency systematics tests. After imposing...
Abstract We report results from a systematic wide-area search for faint dwarf galaxies at heliocentric distances 0.3 to 2 Mpc using the full 6 yr of data Dark Energy Survey (DES). Unlike previous searches over DES data, this specifically targeted field population located beyond Milky Way virial radius. derive our detection efficiency faint, resolved in Local Volume with set synthetic and expect be complete M V ∼ (−7, −10) mag D = (0.3, 2.0) Mpc. find no new dwarfs footprint, but we discovery...
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 present a search for luminous, long-duration ambiguous nuclear transients (ANTs) similar to the unprecedented discovery of extreme, event AT2021lwx with &gt;150 d rise time and luminosity 1045.7 erg s−1. use Lasair transient broker Zwicky Transient Facility (ZTF) data lasting more than one year exhibiting smooth declines. Our returns 59 events, seven which we classify as ANTs assumed be driven by accretion onto supermassive black holes. propose remaining 52 are stochastic...
Aims . Long gamma-ray bursts (LGRB) have been proposed as promising tracers of star formation owing to their association with the core-collapse massive stars. Nonetheless, previous studies we carried out at z < 1 support hypothesis that conditions necessary for progenitor produce an LGRB (e.g. low metallicity), were challenging use LGRBs star-formation tracers, least redshift. The goal this work is characterise population host galaxies 2, investigate in which form these redshifts and...
We present and analyse an extensive dataset of the superluminous supernova (SLSN) LSQ14mo (z = 0.256), consisting a multi-colour lightcurve from -30 d to +70 in rest-frame series 6 spectra PESSTO covering -7 +50 d. This is among densest spectroscopic coverage, best-constrained rising lightcurve, for fast-declining hydrogen-poor SLSN. The bolometric can be reproduced with millisecond magnetar model ~ 4 M_sol ejecta mass, temperature velocity evolution also suggestive as power source. Spectral...
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...
Analyses of type Ia supernovae (SNe Ia) have found puzzling correlations between their standardised luminosities and host galaxy properties: SNe in high-mass, passive hosts appear brighter than those lower-mass, star-forming hosts. We examine the galaxies Dark Energy Survey three-year spectroscopically-confirmed cosmological sample, obtaining photometry a series "local" apertures centred on SN, for global galaxy. study differences these properties, such as stellar mass rest-frame $U-R$...
ABSTRACT While collisionless cold dark matter models have been largely successful in explaining a wide range of observational data, some tensions still exist, and it remains possible that possesses non-negligible level self-interactions. In this paper, we investigate observable consequence self-interacting matter: offsets between the central galaxy centre mass its parent halo. We examine 23 relaxed clusters redshift 0.1–0.3 drawn from Dark Energy Survey Sloan Digital Sky which archival...
Abstract We present griz photometric light curves for the full 5 yr of Dark Energy Survey Supernova (DES-SN) program, obtained with both forced point-spread function photometry on difference images ( DiffImg ) performed during survey operations, and scene modelling (SMP) search processed after survey. This release contains 31,636 19,706 high-quality SMP curves, latter which contain 1635 photometrically classified SNe that pass cosmology quality cuts. sample spans largest redshift z range...
Redshift measurements, primarily obtained from host galaxies, are essential for inferring cosmological parameters type Ia supernovae (SNe Ia). Matching SNe to galaxies using images is non-trivial, resulting in a subset of with mismatched hosts and thus incorrect redshifts. We evaluate the galaxy mismatch rate biases on simulations modeled after Dark Energy Survey 5-Year (DES-SN5YR) photometric sample. For both DES-SN5YR data simulations, we employ directional light radius method matching. In...
ABSTRACT Future constraints of cosmological parameters from Type Ia supernovae (SNe Ia) will depend on the use photometric samples, those samples without spectroscopic measurements SNe Ia. There is a growing number analyses that show can be utilized for precision studies with minimal systematic uncertainties. To investigate this claim, we perform first analysis combines two separate SDSS and Pan-STARRS, including low-redshift anchor. We evaluate consistency these find they are consistent...
The weak gravitational lensing magnification of Type Ia supernovae (SNe Ia) is sensitive to the matter power spectrum on scales $k>1 h$ Mpc$^{-1}$, making it unwise interpret SNe in terms linear scales. We compute probability density function as a standard cosmological parameters, plus an empirical parameter $A_{\rm mod}$ which describes suppression or enhancement non-linear compared cold dark only model. While baryons are expected enhance relevant SN lensing, other physics such neutrino...
The main fuelling processes for Active Galactic Nuclei (AGN) are currently unknown. Previous work showed that galaxies with a large kinematic misalignment between their stellar and gas reservoirs have higher AGN fraction than without misalignment. Such is strong indication of past galaxy interaction or an external accretion event. In this we use integral field spectroscopy data from the SAMI MaNGA surveys to investigate luminosity as function angle. Our sample exhibit bolometric luminosities...