A5011903388- Galaxies: Formation, Evolution, Phenomena
- Stellar, planetary, and galactic studies
- Astronomy and Astrophysical Research
- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astrophysics and Star Formation Studies
- Astrophysics and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Astronomical Observations and Instrumentation
- Advanced Power Generation Technologies
- Adaptive optics and wavefront sensing
- Neutrino Physics Research
- Spectroscopy and Laser Applications
- Astro and Planetary Science
- Cosmology and Gravitation Theories
- Geophysics and Gravity Measurements
- Solar and Space Plasma Dynamics
- History and Developments in Astronomy
- Calibration and Measurement Techniques
- Black Holes and Theoretical Physics
- Bacillus and Francisella bacterial research
- High-pressure geophysics and materials
- Nuclear reactor physics and engineering
- Occupational Health and Safety Research
- Dark Matter and Cosmic Phenomena
Christopher Newport University
2024
Liverpool John Moores University
2014-2023
Newcastle University
2021
Cardiff University
2021
University of Toledo
1995
Royal Observatory
1993-1994
Honolulu University
1990
Imperial College London
1987-1989
Harvard University Press
1913
Cornell University
1913
Literature data are collated for 38 stripped-envelope core-collapse supernovae (SE SNe; i.e. SNe IIb, Ib, Ic and Ic-BL) that have good light curve coverage in more than one optical band. Using bolometric corrections derived previous work, the of each SN is recovered template curves provided. Peak distributions decay rates investigated; subtypes not cleanly distinguished this parameter space, although some grouping types does occur there a suggestion Phillips-like relation most Ic-BL. The...
The Public European Southern Observatory Spectroscopic Survey of Transient Objects (PESSTO) began as a public spectroscopic survey in April 2012. We describe the data reduction strategy and products which are publicly available through ESO archive Data Release 1 (SSDR1). PESSTO uses New Technology Telescope with EFOSC2 SOFI to provide optical NIR spectroscopy imaging. target supernovae transients brighter than 20.5mag for classification. Science targets then selected follow-up based on...
On May 31, 2011 UT a supernova (SN) exploded in the nearby galaxy M51 (the Whirlpool Galaxy). We discovered this event using small telescopes equipped with CCD cameras, as well by Palomar Transient Factory (PTF) survey, and rapidly confirmed it to be Type II supernova. Our early light curve spectroscopy indicates that PTF11eon resulted from explosion of relatively compact progenitor star evidenced rapid shock-breakout cooling seen curve, low temperature early-time spectra prompt appearance...
We discuss the selection and observations of a large sample nearby galaxies, which we are using to quantify star formation activity in local Universe. The consists 334 galaxies across all Hubble types from S0/a Im with recession velocities between 0 3000 km s-1. basic data for each galaxy narrow band H[Nii] R-band imaging, derive rates, equivalent widths surface brightnesses, total magnitudes. A strong correlation is found rate type, strongest isolated occurring Sc Sbc types. More...
Using Hα emission as a tracer of ongoing (<16 Myr old) and near-ultraviolet (UV) recent (16–100 star formation, we present constraints on the properties core-collapse (CC) supernova (SN) progenitors through association their explosion sites with star-forming regions. Amalgamating previous results those gained from new data, statistics large sample SNe; 163.5 Type II (58 IIP, 13 IIL, 13.5 IIb, 19 IIn 12 'impostors', plus 48 no sub-type classification) 96.5 Ib/c (39.5 Ib 52 Ic, five...
We present observations and analysis of 18 stripped-envelope supernovae observed during 2013–2018. This sample consists five H/He-rich SNe, six H-poor/He-rich three narrow lined SNe Ic, four broad Ic. The peak luminosity characteristic time-scales the bolometric light curves are calculated, modelled to derive 56Ni ejecta masses (MNi Mej). Additionally, temperature evolution spectral line velocity each SN examined. Analysis [O i] in nebular phase eight suggests their progenitors had initial...
We present an observational study of the Type IIn supernovae (SNe IIn) 2005ip and 2006jd. Broad-band UV, optical near-IR photometry, visual-wavelength spectroscopy SN complement extend upon published observations to 6.5 years past discovery. Our 2006jd from UV mid-infrared wavelengths, like 2005ip, are compared reported X-ray measurements understand nature progenitor. Both objects display a number similarities with 1988Z-like subclass including: (i) remarkably similar early- late-phase...
We have used new deep observations of the Coma cluster from Galaxy Evolution Explorer to visually identify 13 star-forming galaxies with asymmetric morphologies in ultraviolet (UV). Aided by wide-field optical broad-band and Hα imaging, we interpret features as being due star formation within gas stripped interaction environment. The selected objects display a range structures broad fan-shaped systems filaments knots (‘jellyfish’) narrower smoother tails extending up 100 kpc length. Some...
Through the creation of spectral energy distributions for well-observed literature core-collapse supernovae (CCSNe), we present corrections to transform optical light curves full bolometric curves. These take form parabolic fits colours, with B − I and g r presented as exemplary fits, while parameters other colours are also given. We find evolution colour be extremely homogeneous across CCSNe all types in majority cases, stripped-envelope Type II SNe separately. A separate fit, appropriate...
The Palomar Transient Factory (PTF) is an optical wide-field variability survey carried out using a camera with 7.8 square degree field of view mounted on the 48-in Oschin Schmidt telescope at Observatory. One key goals this to conduct high-cadence monitoring sky in order detect transient sources shortly after they occur. Here, we describe real-time capabilities PTF and our related rapid multiwavelength follow-up programs, extending from radio gamma-ray bands. We present as case study...
We present the discovery, classification, and extensive panchromatic (from radio to X-ray) follow-up observations of PTF11qcj, a supernova (SN) discovered by Palomar Transient Factory (PTF). Our with Karl G. Jansky Very Large Array show that this event is radio-loud: PTF11qcj reached peak luminosity comparable famous gamma-ray-burst-associated SN 1998bw (L5 GHz ≈ 1029 erg s−1 Hz−1). also detected in X-rays Chandra Observatory, infrared band Spitzer. multi-wavelength analysis probes...
We present an analysis of the maximum light, near ultraviolet (NUV; 2900-5500 A) spectra 32 low redshift (0.001<z<0.08) Type Ia supernovae (SNe Ia), obtained with Hubble Space Telescope (HST). combine this spectroscopic sample high-quality gri light curves robotic telescopes to measure photometric parameters, such as stretch, optical colour, and brightness. By comparing our data a comparable SNe at intermediate-z (0.4<z<0.9), we detect modest spectral evolution (3-sigma), in sense that mean...
We investigate the connection between morphology and internal kinematics of stellar component central galaxies with mass |$M_\star \gt {10}^{9.5} \, {\rm M}_\odot$| in EAGLE simulations. compare several kinematic diagnostics commonly used to describe simulated galaxies, find good consistency them. model structure as ellipsoids quantify their via ratios principal axes. show that differentiation blue star-forming red quiescent using morphological can be achieved similar efficacy use...
We explore constraints on the joint photometric and morphological evolution of typical low redshift galaxies as they move from blue cloud through green valley onto red sequence. select GAMA survey with $10.25<{\rm log}(M_*/M_\odot)<10.75$ $z<0.2$ classified according to their intrinsic $u^*-r^*$ colour. From single component S\'ersic fits, we find that stellar mass-sensitive $K-$band profiles galaxy populations are very similar, while $g-$band indicate more disk-like morphologies for...
ABSTRACT We estimate the intracluster light (ICL) component within a sample of 18 clusters detected in XMM Cluster Survey (XCS) data using deep (∼26.8 mag) Hyper Suprime-Cam Subaru Strategic Programme release 1 i-band data. apply rest-frame μB = 25 mag arcsec−2 isophotal threshold to our clusters, below which we define as ICL an aperture RX,500 (X-ray R500) centred on brightest cluster galaxy (BCG). After applying careful masking and corrections for flux losses from background subtraction,...
We have imaged a sample of 45 face-on spiral galaxies in the K band, to determine morphology old stellar population, which dominates mass disc. The K-band images been used calculate different characteristics underlying density perturbation such as arm strengths, profiles and cross-sections, pitch angles. Contrary expectations, no correlation was found between angle Hubble type, combined with previous results this leads us conclude that population bears little resemblance optical classify galaxies.
We present observational constraints on the nature of different core-collapse supernova (SN) types through an investigation association their explosion sites with recent star formation (SF), as traced by Hα+[N ii] line emission. discuss results analysed data positions 168 SNe respect to Hα emission within host galaxies. From our analysis we find that overall type II progenitor population does not trace underlying SF. Our are consistent a significant fraction SNII arising from stars less than...
We consider the massive star formation properties, radial profiles, and atomic gas masses of those galaxies in our Hα Galaxy Survey that have close companion galaxies, comparison with a matched control sample without companions. Our analysis is based on continuum images 327 disk form representative local universe. find presence raises rate by factor just below two, while hardly at all increasing equivalent width emission. This means although statistically companions stars higher rate, they...
We present constraints on the progenitor metallicities of core-collapse supernovae. To date, nearly all metallicity have been inferred from indirect methods such as gradients in host galaxies, luminosities galaxies or derived global galaxy metallicities. Here, are optical spectra taken at sites nearby supernovae, ratio strong emission lines found their H ii regions. results 74 regions and discuss implications that these nature supernova progenitors. Overall, while we find mean Type Ibc...
We present observational constraints on the nature of core-collapse supernovae through an investigation into their radial distributions with respect to those young and old stellar populations within host galaxies, as traced by H-alpha emission R-band light respectively. discuss results implications they have supernova progenitors, for a sample 177 supernovae. find that positions overall population closely follow distribution emission, implying both are excellent tracers star formation...